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48 48

Crystal structure and physical properties of AmPd5Al2

Sep 18, 2013 09/13

by J. -C. Griveau; K. Gofryk; D. Bouëxière; E. Colineau; J. Rebizant

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We report on the crystal structure, magnetic susceptibility, specific heat, electrical and thermoelectrical properties of AmPd5Al2, the americium counterpart of the unconventional superconductor NpPd5Al2. AmPd5Al2 crystallizes in the ZrNi2Al5-type of structure with lattice parameters: a = 4.1298 A and c = 14.7925 A. Magnetic measurements of AmPd5Al2 indicate a paramagnetic behavior with no hint of magnetic ordering nor superconductivity down to 2 K. This aspect is directly related to its 5f6...
Source: http://arxiv.org/abs/1201.5664v1

Arxiv.org

4 4.0

$Thermoelectric power as a probe of density of states in correlated actinide materials: the case of PuCoGa$_{5}$ superconductor$

Thermoelectric power as a probe of density of states in correlated actinide materials: the case of PuCoGa$_{5}$ superconductor

Jun 29, 2018 06/18

by K. Gofryk; J-C. Griveau; P. S. Riseborough; T. Durakiewicz

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We present measurements of the thermoelectric power of the plutonium-based unconventional superconductor PuCoGa$_{5}$. The data is interpreted within a phenomenological model for the quasiparticle density of states of intermediate valence systems and the results are compared with results obtained from photoemission spectroscopy. The results are consistent with intermediate valence nature of 5$f$-electrons, furthermore, we propose that measurements of the Seebeck coefficient can be used as a...
Topics: Condensed Matter, Strongly Correlated Electrons
Source: http://arxiv.org/abs/1610.07581

Arxiv.org

160 160

Magnetic and transport properties of rare-earth-based half-Heusler phases RPdBi: prospective systems for topological quantum phenomena

Sep 21, 2013 09/13

by K. Gofryk; D. Kaczorowski; T. Plackowski; A. Leithe-Jasper; Yu. Grin

eye 160

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RPdBi (R = Er, Ho, Gd, Dy, Y, Nd) compounds were studied by means of x-ray diffraction, magnetic susceptibility, electrical resistivity, magnetoresistivity, thermoelectric power and Hall effect measurements, performed in the temperature range 1.5-300 K and in magnetic fields up to 12 T. These ternaries, except diamagnetic YPdBi, exhibit localized magnetism of $R^{3+}$ ions, and order antiferromagnetically at low temperatures ($T_{N}$ = 2-13 K). The transport measurements revealed behavior...
Source: http://arxiv.org/abs/1106.3763v1

Arxiv.org

76 76

Pressure-Tuned Point-Contact Spectroscopy of URu2Si2 from Hidden Order to Antiferromagnetic States: Similarity of the Fermi Surface Gapping

Sep 23, 2013 09/13

by Xin Lu; F. Ronning; P. H. Tobash; K. Gofryk; E. D. Bauer; J. D. Thompson

eye 76

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We report soft point-contact spectroscopy studies of URu2Si2 both in the hidder order (HO) and the large-moment antiferromagnetic (LMAF) states accessed by pressure. In the HO state at ambient pressure, the spectroscopy shows two asymmetric peaks around the Fermi energy that emerge below the hidden order temperature T_{HO}. In the LMAF state at higher pressures, the spectra are remarkably similar to those in the HO state, indicating a similar Fermi surface gapping in the HO and LMAF states and...
Source: http://arxiv.org/abs/1112.5669v1

Arxiv.org

55 55

Evidence for +-s-wave pairing symmetry in LiFeAs: specific heat study

Jul 20, 2013 07/13

by Dong-Jin Jang; J. B. Hong; Y. S. Kwon; T. Park; K. Gofryk; F. Ronning; J. D. Thompson; Yunkyu Bang

eye 55

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We report specific heat capacity measurements on a LiFeAs single crystal at temperatures down to 400 mK and magnetic fields up to 9 Tesla. A small specific heat jump at Tc and finite residual density of states at T=0 K in the superconducting (SC) state indicate that there are strong unitary scatterers that lead to states within the SC gap. A sub-linear magnetic field dependence of the Sommerfeld coefficient \gamma(H) at T=0 K is equally well fitted by both a nodal d-wave gap as well as a sign...
Source: http://arxiv.org/abs/1203.1362v1

Arxiv.org

3 3.0

$Fermi-Surface Reconstruction and Complex Phase Equilibria in CaFe$_{2}$As$_{2}$$

Fermi-Surface Reconstruction and Complex Phase Equilibria in CaFe$_{2}$As$_{2}$

Jun 30, 2018 06/18

by K. Gofryk; B. Saparov; T. Durakiewicz; A. Chikina; S. Danzenbächer; D. V. Vyalikh; M. J. Graf; A. S. Sefat

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Fermi-surface topology governs the relationship between magnetism and superconductivity in iron-based materials. Using low-temperature transport, angle-resolved photoemission, and x-ray diffraction we show unambiguous evidence of large Fermi surface reconstruction in CaFe$_{2}$As$_{2}$ at magnetic spin-density-wave and nonmagnetic collapsed-tetragonal ($cT$) transitions. For the $cT$ transition, the change in the Fermi surface topology has a different character with no contribution from the...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1404.1095

Arxiv.org

50 50

$A doping dependent specific heat study of the superconducting gap in Ba(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$$

A doping dependent specific heat study of the superconducting gap in Ba(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$

Sep 22, 2013 09/13

by K. Gofryk; A. S. Sefat; M. A. McGuire; B. C. Sales; D. Mandrus; J. D. Thompson; E. D. Bauer; F. Ronning

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We report a doping, magnetic field and low-temperature dependent study of the specific heat of the iron-arsenide Ba(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$ at under (x=0.045), optimal (x=0.08) and overdoped (x=0.103 and 0.105) regimes. By subtracting the lattice specific heat the temperature and magnetic field dependence of the electronic specific heat has been studied. The temperature and field dependencies of the superconducting part of $C_{p}$ exhibit similar behavior for all doping...
Source: http://arxiv.org/abs/1004.4576v3

Arxiv.org

107 107

Effect of annealing on the specific heat of Ba(Fe1-xCox)2As2

Sep 19, 2013 09/13

by K. Gofryk; A. B. Vorontsov; I. Vekhter; A. S. Sefat; T. Imai; E. D. Bauer; J. D. Thompson; F. Ronning

eye 107

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We report on the effect of annealing on the temperature and field dependencies of the low temperature specific heat of the electron-doped Ba(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$ for under-(x = 0.045), optimal- (x = 0.08) and over-doped (x = 0.105 and 0.14) regimes. We observed that annealing significantly improves some superconducting characteristics in Ba(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$. It considerably increases $T_{c}$, decreases $\gamma_{0}$ in the superconducting state and suppresses the...
Source: http://arxiv.org/abs/1009.1091v2

Arxiv.org

39 39

Gap structure in the electron-doped Iron-Arsenide Superconductor Ba(Fe0.92Co0.08)2As2: low-temperature specific heat study

Sep 22, 2013 09/13

by K. Gofryk; A. S. Sefat; E. D. Bauer; M. A. McGuire; B. C. Sales; D. Mandrus; J. D. Thompson; F. Ronning

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We report the field and temperature dependence of the low-temperature specific heat down to 400 mK and in magnetic fields up to 9 T of the electron-doped Ba(Fe0.92Co0.08)2As2 superconductor. Using the phonon specific heat obtained from pure BaFe2As2 we find the normal state Sommerfeld coefficient to be 18 mJ/mol.K^2 and a condensation energy of 1.27 J/mol. The temperature dependence of the electronic specific heat clearly indicate the presence of the low-energy excitations in the system. The...
Source: http://arxiv.org/abs/1001.4564v1

Arxiv.org

44 44

Anisotropic critical magnetic fluctuations in the ferromagnetic superconductor UCoGe

Sep 23, 2013 09/13

by C. Stock; D. A. Sokolov; P. Bourges; P. H. Tobash; K. Gofryk; F. Ronning; E. D. Bauer; K. C. Rule; A. D. Huxley

eye 44

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We report neutron scattering measurements of critical magnetic excitations in the weakly ferromagnetic superconductor UCoGe. The strong non-Landau damping of the excitations we observe, although unusual has been found in another related ferromagnet, UGe2 at zero pressure. However, we also find there is a significant anisotropy of the magnetic correlation length in UCoGe that contrasts with an almost isotropic length for UGe2. The values of the magnetic correlation length and damping are found...
Source: http://arxiv.org/abs/1109.4541v1

Arxiv.org

3 3.0

$Short-range magnetic correlations in the highly-correlated electron compound CeCu$_{4}Ga$

Short-range magnetic correlations in the highly-correlated electron compound CeCu$_{4}Ga

Jun 30, 2018 06/18

by B. G. Ueland; C. F. Miclea; K. Gofryk; Y. Qiu; F. Ronning; R. Movshovich; E. D. Bauer; J. S. Gardner; J. D. Thompson

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We present experimental results for the heavy-electron compound CeCu$_{4}$Ga which show that it possesses short-range magnetic correlations down to a temperature of $T = 0.1$ K. Our neutron scattering data show no evidence of long-range magnetic order occurring despite a peak in the specific heat at $T^{*} =1.2$ K. Rather, magnetic diffuse scattering occurs which corresponds to short-range magnetic correlations occurring across two unit cells. The specific heat remains large as $T\sim0$ K...
Topics: Strongly Correlated Electrons, Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1408.6576

Arxiv.org

61 61

$Effect of annealing on the specific heat of optimally doped Ba(Fe$_{0.92}$Co$_{0.08}$)$_{2}$As$_{2}$$

Effect of annealing on the specific heat of optimally doped Ba(Fe$_{0.92}$Co$_{0.08}$)$_{2}$As$_{2}$

Sep 19, 2013 09/13

by K. Gofryk; A. S. Sefat; M. A. McGuire; B. C. Sales; D. Mandrus; T. Imai; J. D. Thompson; E. D. Bauer; F. Ronning

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We report the temperature dependence of the low-temperature specific heat down to 400 mK of the electron-doped Ba(Fe$_{0.92}$Co$_{0.08}$)$_{2}$As$_{2}$ superconductors. We have measured two samples extracted from the same batch: first sample has been measured just after preparation with no additional heat treatment. The sample shows $T_{c}$=20 K, residual specific heat $\gamma_{0}$=3.6 mJ/mol K$^{2}$ and a Schottky-like contribution at low temperatures. A second sample has been annealed at 800...
Source: http://arxiv.org/abs/1009.0954v1

Arxiv.org

49 49

$Unusual signatures of the ferromagnetic transition in the heavy Fermion compound UMn$_2$Al$_{20}$$

Unusual signatures of the ferromagnetic transition in the heavy Fermion compound UMn$_2$Al$_{20}$

Sep 21, 2013 09/13

by C. H. Wang; J. M. Lawrence; E. D. Bauer; K. Kothapalli; J. S. Gardner; F. Ronning; K. Gofryk; J. D. Thompson; H. Nakotte; F. Trouw

eye 49

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Magnetic susceptibility results for single crystals of the new cubic compounds UT$_2$Al$_{20}$ (T=Mn, V, and Mo) are reported. Magnetization, specific heat, resistivity, and neutron diffraction results for a single crystal and neutron diffraction and inelastic spectra for a powder sample are reported for UMn$_2$Al$_{20}$. For T = V and Mo, temperature independent Pauli paramagnetism is observed. For UMn$_2$Al$_{20}$, a ferromagnetic transition is observed in the magnetic susceptibility at $T_c$...
Source: http://arxiv.org/abs/1008.2235v1

Arxiv.org

96 96

Electronic tuning and uniform superconductivity in CeCoIn5

Sep 22, 2013 09/13

by K. Gofryk; F. Ronning; J. -X. Zhu; M. N. Ou; P. H. Tobash; S. S. Stoyko; X. Lu; A. Mar; T. Park; E. D. Bauer; J. D. Thompson; Z. Fisk

eye 96

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We report a globally reversible effect of electronic tuning on the magnetic phase diagram in CeCoIn_{5} driven by electron (Pt and Sn) and hole (Cd, Hg) doping. Consequently, we are able to extract the superconducting pair breaking component for hole and electron dopants with pressure and co-doping studies, respectively. We find that these nominally non-magnetic dopants have a remarkably weak pair breaking effect for a d-wave superconductor. The pair breaking is weaker for hole dopants, which...
Source: http://arxiv.org/abs/1210.0672v1

Arxiv.org

52 52

$Calorimetric Evidence for Nodes in the Overdoped Ba(Fe$_{0.9}$Co$_{0.1}$)$_{2}$As$_{2}$$

Calorimetric Evidence for Nodes in the Overdoped Ba(Fe$_{0.9}$Co$_{0.1}$)$_{2}$As$_{2}$

Sep 21, 2013 09/13

by Dong-Jin Jang; A. B. Vorontsov; I. Vekhter; K. Gofryk; Z. Yang; S. Ju; J. B. Hong; J. H. Han; Y. S. Kwon; F. Ronning; J. D. Thompson; Tuson Park

eye 52

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We present low-temperature specific heat of the electron-doped Ba(Fe$_{0.9}$Co$_{0.1}$)$_{2}$As$_{2}$, which does not show any indication of an upturn down to 400 mK, the lowest measuring temperature. The lack of a Schottky-like feature at low temperatures or in magnetic fields up to 9 Tesla enables us to identify enhanced low-temperature quasiparticle excitations and to study anisotropy in the linear term of the specific heat. Our results can not be explained by a single or multiple isotropic...
Source: http://arxiv.org/abs/1011.4808v1

Arxiv.org

52 52

$Quantum critical behavior in the heavy Fermion single crystal Ce(Ni$_{0.935}$Pd$_{0.065}$)$_2$Ge$_2$$

Quantum critical behavior in the heavy Fermion single crystal Ce(Ni$_{0.935}$Pd$_{0.065}$)$_2$Ge$_2$

Sep 21, 2013 09/13

by C. H. Wang; J. M. Lawrence; A. D. Christianson; S. Chang; K. Gofryk; E. D. Bauer; F. Ronning; J. D. Thompson; K. J. McClellan; J. A. Rodriguez-Rivera; J. W. Lynn

eye 52

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We have performed magnetic susceptibility, specific heat, resistivity, and inelastic neutron scattering measurements on a single crystal of the heavy Fermion compound Ce(Ni$_{0.935}$Pd$_{0.065}$)$_2$Ge$_2$, which is believed to be close to a quantum critical point (QCP) at T = 0. At lowest temperature(1.8-3.5 K), the magnetic susceptibility behaves as $\chi(T)-\chi (0)$ $\propto$ $T^{-1/6}$ with $\chi (0) = 0.032 \times 10^{-6}$ m$^3$/mole (0.0025 emu/mole). For $T
Source: http://arxiv.org/abs/1104.0203v1

Arxiv.org

48 48

Revealing multiple gaps in the electronic structure of USb2 using femtosecond optical pulses

Sep 23, 2013 09/13

by J. Qi; T. Durakiewicz; S. A. Trugman; J. -X. Zhu; P. S. Riseborough; R. Baumbach; E. D. Bauer; K. Gofryk; J. -Q. Meng; J. J. Joyce; A. J. Taylor; R. P. Prasankumar

eye 48

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Ultrafast optical spectroscopy is used to study the antiferromagnetic f-electron system USb2. We observe the opening of two charge gaps at low temperatures (
Source: http://arxiv.org/abs/1303.2694v1

Arxiv.org

97 97

Kondo behavior, ferromagnetic correlations, and crystal fields in the heavy Fermion compounds Ce3X (X=In, Sn)

Sep 17, 2013 09/13

by C. H. Wang; J. M. Lawrence; A. D. Christianson; E. A. Goremychkin; V. R. Fanelli; K. Gofryk; E. D. Bauer; F. Ronning; J. D. Thompson; N. R. de Souza; A. I. Kolesnikov; K. C. Littrell

eye 97

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We report measurements of inelastic neutron scattering, magnetic susceptibility, magnetization, and the magnetic field dependence of the specific heat for the heavy Fermion compounds Ce$_3$In and Ce$_3$Sn. The neutron scattering results show that the excited crystal field levels have energies $E_1$ = 13.2 meV, $E_2$ = 44.8 meV for Ce$_3$In and $E_1$ = 18.5 meV, $E_2$ = 36.1 meV for Ce$_3$Sn. The Kondo temperature deduced from the quasielastic linewidth is 17 K for Ce$_3$In and 40 K for...
Source: http://arxiv.org/abs/1003.3462v1

Arxiv.org

43 43

Negative thermal expansion and antiferromagnetism in the actinide oxypnictide NpFeAsO

Sep 20, 2013 09/13

by T. Klimczuk; H. C. Walker; R. Springell; A. B. Shick; A. H. Hill; P. Gaczynski; K. Gofryk; S. A. J. Kimber; C. Ritter; E. Colineau; J. -C. Griveau; D. Bouexiere; R. Eloirdi; R. J. Cava; R. Caciuffo

eye 43

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A neptunium analogue of the LaFeAsO tetragonal layered compound has been synthesized and characterized by a variety of experimental techniques. The occurrence of long-range magnetic order below a critical temperature T_N = 57 K is suggested by anomalies in the temperature-dependent magnetic susceptibility, electrical resistivity, Hall coefficient, and specific heat curves. Below T_N, powder neutron diffraction measurements reveal an antiferromagnetic structure of the Np sublattice, with an...
Source: http://arxiv.org/abs/1205.0438v1

Arxiv.org

7 7.0

$Quantum Critical Fluctuations in the Heavy fermion compound Ce(Ni$_{0.935}$Pd$_{0.065}$)$_2$Ge$_2$$

Quantum Critical Fluctuations in the Heavy fermion compound Ce(Ni$_{0.935}$Pd$_{0.065}$)$_2$Ge$_2$

Jun 30, 2018 06/18

by C. H. Wang; L. Poudel; A. E. Taylor; J. M. Lawrence; A. D. Christianson; S. Chang; J. A. Rodriguez-Rivera; J. W. Lynn; A. A. Podlesnyak; 1 G. Ehlers; R. E. Baumbach; E. D. Bauer; K. Gofryk; F. Ronning; K. J. McClellan; J. D. Thompson

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Electric resistivity, specific heat, magnetic susceptibility, and inelastic neutron scattering experiments were performed on a single crystal of the heavy fermion compound Ce(Ni$_{0.935}$Pd$_{0.065}$)$_2$Ge$_2$ in order to study the spin fluctuations near an antiferromagnetic (AF) quantum critical point (QCP). The resistivity and the specific heat coefficient for $T \leq$ 1 K exhibit the power law behavior expected for a 3D itinerant AF QCP ($\rho(T) \sim T^{3/2}$ and $\gamma(T) \sim \gamma_0 -...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1411.3689

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