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39
Sep 22, 2013
09/13
by
V. H. Tran; A. D. Hillier; D. T. Adroja; D. Kaczorowski
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Transverse-field muon-spin-rotation measurements have been carried out for polycrystalline ThPt4Ge12. The magnetic penetration depth $\lambda$ and the superconducting coherence length $\xi$ in the vortex state of this compound were found to be 112(5) nm and 32(2) nm, respectively. We have estimated the effective mass of the quasiparticles $m^* \approx 4.6\times m_e$, the superfluid carrier density $n_s \approx 1.02 \times 10^{28}$ carriers/m$^{3}$, and the zero-temperature superconducting gap...
Source: http://arxiv.org/abs/0908.1304v1
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3.0
Jun 30, 2018
06/18
by
P. Starowicz; R. Kurleto; J. Goraus; H. Schwab; M. Szlawska; F. Forster; A. Szytula; I. Vobornik; D. Kaczorowski; F. Reinert
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We studied the electronic structure of the Kondo lattice system Ce2Co0.8Si3.2 by angle-resolved photoemission spectroscopy (ARPES). The spectra obtained below the coherence temperature consist of a Kondo resonance, its spin-orbit partner and a number of dispersing bands. The quasiparticle weight related to the Kondo peak depends strongly on Fermi vectors associated with bulk bands. This indicates a highly anisotropic hybridization between conduction band and 4f electrons - V_{cf} in...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1404.7003
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5.0
Jun 28, 2018
06/18
by
K. Götze; J. Klotz; D. Gnida; H. Harima; D. Aoki; A. Demuer; S. Elgazzar; J. Wosnitza; D. Kaczorowski; I. Sheikin
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We report low-temperature de Haas-van Alphen (dHvA) effect measurements in magnetic fields up to 35 T of the heavy-fermion superconductor Ce$_2$PdIn$_8$. The comparison of the experimental results with band-structure calculations implies that the 4$f$ electrons are itinerant rather than localized. The cyclotron masses estimated at high field are only moderately enhanced, 8 and 14 $m_0$, but are substantially larger than the corresponding band masses. The observed angular dependence of the dHvA...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1509.02657
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30
Sep 22, 2013
09/13
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D. Kaczorowski; A. P. Pikul; U. Burkhardt; M. Schmidt; A. Slebarski; A. Szajek; M. Werwinski; Yu. Grin
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The crystal structures and the physical (magnetic, electrical transport and thermodynamic) properties of the ternary compounds CeRhSi2 and Ce2Rh3Si5 (orthorhombic CeNiSi2- and U2Co3Si5-type structures, respectively) were studied in wide ranges of temperature and magnetic field strength. The results revealed that both materials are valence fluctuating systems, in line with previous literature reports. Direct evidence for valence fluctuations was obtained by means of Ce LIII-edge x-ray absorption...
Source: http://arxiv.org/abs/1004.4731v1
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41
Sep 22, 2013
09/13
by
K. Hashimoto; Y. Mizukami; R. Katsumata; H. Shishido; M. Yamashita; H. Ikeda; Y. Matsuda; J. A. Schlueter; J. D. Fletcher; A. Carrington; D. Gnida; D. Kaczorowski; T. Shibauchi
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When a second-order magnetic phase transition is tuned to zero temperature by a non-thermal parameter, quantum fluctuations are critically enhanced, often leading to the emergence of unconventional superconductivity. In these `quantum critical' superconductors it has been widely reported that the normal-state properties above the superconducting transition temperature $T_c$ often exhibit anomalous non-Fermi liquid behaviors and enhanced electron correlations. However, the effect of these strong...
Source: http://arxiv.org/abs/1302.2945v1
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51
Sep 21, 2013
09/13
by
D. Kaczorowski; J. Klamut; A. J. Zaleski
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eye 51
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Short discussion trying to explain, why superconductivity revealed for some diborides is not always confirmed in experiments of different research groups.
Source: http://arxiv.org/abs/cond-mat/0104479v1
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141
Sep 21, 2013
09/13
by
K. Gofryk; D. Kaczorowski; T. Plackowski; A. Leithe-Jasper; Yu. Grin
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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
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38
Sep 22, 2013
09/13
by
D. Kaczorowski; A. P. Pikul; D. Gnida; V. H. Tran
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Reply to "Comment on by Uhlirova et al."
Source: http://arxiv.org/abs/1001.4609v1
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42
Sep 18, 2013
09/13
by
A. P. Pikul; D. Kaczorowski
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eye 42
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Polycrystalline samples of the isostructural alloys UNi1-xCoxSi2 (0
Source: http://arxiv.org/abs/1201.1075v1
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46
Sep 22, 2013
09/13
by
D. Kaczorowski; A. P. Pikul; D. Gnida; V. H. Tran
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eye 46
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Single crystals of Ce2PdIn8 were studied by means of magnetic susceptibility, electrical resistivity and specific heat measurements. The compound was found to be a heavy fermion clean-limit superconductor with Tc = 0.68 K. Most remarkably, the superconductivity in this system emerges out of the antiferromagnetic state that sets in at TN = 10 K, and both cooperative phenomena coexist in a bulk at ambient pressure conditions.
Source: http://arxiv.org/abs/0906.1881v2
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90
Sep 24, 2013
09/13
by
D. Kaczorowski; A. J. Zaleski; O. J. Żogał; J. Klamut
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Magnetic properties of TaB$_{2}$ were studied by means of DC and AC susceptibility measurements. It has been found that the compound becomes superconducting at T$_{c}$ = 9.5 K. From upper critical field measurements the superconducting parameters have been evaluated, which indicated that TaB$_{2}$ is a hard type-II superconductor. Possible reasons why superconductivity has not been discovered in previous studies are briefly discussed.
Source: http://arxiv.org/abs/cond-mat/0103571v2
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52
Sep 21, 2013
09/13
by
Y. Tokiwa; P. Gegenwart; D. Gnida; D. Kaczorowski
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eye 52
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We report low-temperature specific heat measurements in magnetic fields up to 12 T applied parallel and perpendicular to the tetragonal c-axis of the heavy fermion superconductor Ce$_2$PdIn$_8$. In contrast to its quasi-two-dimensional (2D) relative CeCoIn$_5$, the system displays an almost isotropic upper critical field. While there is no indication for a FFLO phase in Ce$_2$PdIn$_8$, the data suggest a smeared weak first-order superconducting transition close to $H_{c2}\approx 2$ T. The...
Source: http://arxiv.org/abs/1108.2362v2
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46
Sep 22, 2013
09/13
by
A. P. Pikul; D. Kaczorowski; Z. Gajek; J. Stepien--Damm; A. Slebarski; M. Werwinski; A. Szajek
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eye 46
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Single-crystalline CeRh3Si2 was investigated by means of x-ray diffraction, magnetic susceptibility, magnetization, electrical resistivity, and specific heat measurements carried out in wide temperature and magnetic field ranges. Moreover, the electronic structure of the compound was studied at room temperature by cerium core-level x-ray photoemission spectroscopy (XPS). The physical properties were analyzed in terms of crystalline electric field and compared with results of ab-initio band...
Source: http://arxiv.org/abs/1004.3858v1
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31
Sep 23, 2013
09/13
by
A. P. Pikul; D. Kaczorowski
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Polycrystalline samples of the solid solution Ce2Cu2-xNixIn were studied by means of x-ray powder diffraction, magnetic susceptibility and electrical resistivity measurements performed in a wide temperature range. Partial substitution of copper atoms by nickel atoms results in quasi-linear decrease of the lattice parameters and the unit cell volume of the system. The lattice compression leads to an increase in the exchange integral and yields a reversal in the order of the magnetic 4f1 and...
Source: http://arxiv.org/abs/1111.4874v1
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43
Sep 18, 2013
09/13
by
H. Fukazawa; R. Nagashima; S. Shimatani; Y. Kohori; D. Kaczorowski
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Nuclear quadrupole resonance measurements were performed on the heavy fermion superconductor Ce2PdIn8. Above the Kondo coherence temperature T_coh \simeq 30K, the spin-lattice relaxation rate 1/T_1 is temperature independent, whereas at lower temperatures, down to the onset of superconductivity at T_c = 0.64K, it is nearly proportional to T^{1/2}. Below T_c, 1/T_1 shows no coherence peak and decreases as T^3 down to 75mK. All these findings indicate that Ce2PdIn8 is close to the...
Source: http://arxiv.org/abs/1209.2765v1
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103
Sep 22, 2013
09/13
by
D. Kaczorowski; D. Gnida; A. P. Pikul; V. H. Tran
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The compound Ce2PdIn8 is a recently discovered novel member of the series Ce(n)TIn(3n+2), where T = d-electron transition metal, and n = 1 or 2. So far, only the phases with T = Co, Rh and Ir have been intensively studied for their unconventional superconducting behaviors at low temperatures. By means of magnetic susceptibility, electrical resistivity and heat capacity measurements we provide evidence that also Ce2PdIn8 has a superconducting ground state with strong heavy-fermion character. The...
Source: http://arxiv.org/abs/1001.4607v1
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Sep 21, 2013
09/13
by
A. T. Holmes; T. Muramatsu; D. Kaczorowski; Z. Bukowski; T. Kagayama; K. Shimizu
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The heavy fermion antiferromagnet CeNiGe2 was investigated under pressure by resistivity and ac calorimetry up to 4 GPa and down to 40 mK. The two magnetic transitions found in both resistivity and specific heat at 0.1 GPa at T_N1=3.95 and T_{N2}=3.21 K are replaced by a single one at 0.7 GPa and 2.81 K. Increasing pressure initially reduces this further, however at about 1.7 GPa a new transition appears, accompanied by a marked change in the pressure dependence of the ordering temperatures,...
Source: http://arxiv.org/abs/0901.4909v2
