Scaling the Kondo lattice

Yang, Yi-feng; Fisk, Z.; Lee, Hanoh; Thompson, J. D.; Pines, David

doi:10.1038/nature07157

Cited by 217 publications

(283 citation statements)

References 30 publications

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“…The maximum is caused by the magnetic part of the resistivity and corresponds to onset of low-temperature coherent behaviour of a Kondo lattice, and the characteristic temperature is generally marked as T * [25]. A rough estimation of T * can be also obtained from the departure of the susceptibility data from the Curie-Weiss behaviour [26] yielding the value T *χ = 40 K (polycrystalline average). Although both values are in agreement, we would be careful to draw conclusion, since they were found to be sample dependent.…”

Section: Resultsmentioning

confidence: 99%

Solution growth of Ce–Pd–In single crystals: Characterization of the heavy-fermion superconductor Ce2PdIn8

et al. 2010

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Solution growth of single crystals of the recently reported new compound Ce 2 PdIn 8 was investigated. When growing from a stoichiometry in a range 2:1:20 -2:1:35, single crystals of CeIn 3 covered by a thin (~50 μm) single-crystalline layer of Ce 2 PdIn 8 were mostly obtained. Using palladium richer compositions the thickness of the Ce 2 PdIn 8 layers were increased, which allowed mechanical extraction of single-phase slabs of the desired compound suitable for a thorough study of magnetism and superconductivity. In some solution growth products also CePd 3 In 6 (LaNi 3 In 6 -type of structure) and traces of phases with the stoichiometry CePd 2 In 7 , Ce 1.5 Pd 1.5 In 7 (determined only by EDX) have been identified. Magnetic measurements of the Ce 2 PdIn 8 single crystals reveal paramagnetic behaviour of the Ce 3+ ions with significant magnetocrystalline anisotropy. Above 70 K the magnetic susceptibility follows the Curie-Weiss law with considerably different values of the paramagnetic Curie temperature, for the magnetic field applied along the a-(-90 K) and c-(-50 K) axis. Below the reported critical temperature for superconductivity T c (0.69 K) the electrical resistivity drops to zero. Comparative measurements of the electrical resistivity, heat capacity and AC susceptibility of several crystals reveal that the superconducting transition is strongly sample-dependent. IntroductionIn some Ce-based compounds, the interaction of the Ce ions with the conduction electrons often leads to a large enhancement of the effective electron mass. These socalled heavy-fermion (HF) compounds exhibit attractive electronic properties, such as strongly enhanced paramagnetism, non-Fermi liquid behaviour, interplay between magnetism and superconductivity (SC), etc. During the last decade, the attention of many researchers has been focused on the series of HF materials of the general chemical formula Ce m T n In 3m+2n where m, n = 1 or 2 and T = Co, Rh, Ir. These compounds crystallize in the Ho m Co n Ga 3m+2n -type tetragonal structures with the space group P4/mmm. These structures are built by n layers of distorted cuboctahedra [CeIn 3 ] and one monolayer of rectangular parallelepipeds [TIn 2 ] stacked sequentially in the [001] direction [1] making the structure to be quasi-2D. The main building block of these compounds, the cubic CeIn 3 , is a heavy-fermion antiferromagnet (AF) with a Néel temperature T N = 10.2 K [2] and becomes superconducting (SC) under pressure [3]. The whole Ce m T n In 3m+2n series is characterized by interplay between magnetism and unconventional superconductivity, which makes these compounds suitable for thorough studies of varieties of the two cooperative phenomena in strongly correlated electron systems. The quasi-2D R m T n In 3m+2n crystal structure provides investigation of the effect of varying dimensionality on magnetism and unconventional superconductivity because

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Section: Resultsmentioning

confidence: 99%

Solution growth of Ce–Pd–In single crystals: Characterization of the heavy-fermion superconductor Ce2PdIn8

et al. 2010

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“…20 Yb substitution, however, shows a different behavior 4,24,25 in that T c and the Kondo-coherence temperature do not scale, in contrast to other heavy-fermion compounds. 27 In its divalent state, Yb is expected to act as a nonmagnetic dilution destroying the Kondo coherence and superconductivity. Recent experiments, though, indicate 25 or have found evidence 24 for an intermediate valence of Yb in Ce 1−x Yb x CoIn 5 that might explain the observed features.…”

Section: And References Therein)mentioning

confidence: 99%

Fermi-surface evolution in Yb-substituted CeCoIn5

et al. 2012

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We report results of systematic de Haas-van Alphen (dHvA) studies on Ce 1−x Yb x CoIn 5 single crystals with varying Yb concentration. For x = 0.1, the well-known Fermi surfaces and the heavy effective masses of CeCoIn 5 (x = 0) have changed only slightly. We start to observe changes of the Fermi-surface topology at x = 0.2 leading to a drastic reconstruction above x = 0.55. At these concentrations, the effective masses are reduced considerably to values between 0.7 and 2.6 free electron masses. For both YbCoIn 5 and CeCoIn 5 , the angular-resolved dHvA frequencies can be very well described by conventional density-functional theory calculations. Projection of the Bloch states onto atomic Yb-4f orbitals yields a 4f occupation of 13.7 electrons, in agreement with previous experimental results indicating an intermediate Yb valence of +2.3.

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“…On the other hand, for J Ͻ J c , on the AFM side of the QCP in the Doniach analysis, a mean-field renormalization group approach 16 provided a good agreement between theory and the experimental results 17 on the pressure-tuned AFM transition temperatures in a series of CeT 2 Si 2 ͑T = Ru, Rh, and Pd͒ compounds. However, the interplay between the Kondo and RKKY interactions in this regime is not yet fully understood, 18 and additional work, both theoretical and experimental, is needed. In this paper we provide an example of a compound which orders magnetically at low temperature, in the regime where previously studied compounds display dominant Kondo screening.…”

Section: Introductionmentioning

confidence: 99%

Thermal and magnetic properties of the low-temperature antiferromagnetCe4Pt12Sn25

et al. 2010

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We report specific heat ͑C͒ and magnetization ͑M͒ of single crystalline Ce 4 Pt 12 Sn 25 at temperature down to ϳ50 mK and in fields up to 3 T. C / T exhibits a sharp anomaly at 180 mK, with a large ⌬C / T ϳ 30 J / mol Ce K 2 , which, together with the corresponding cusplike magnetization anomaly, indicates an antiferromagnetic ͑AFM͒ ground state with a Néel temperature T N = 180 m K. Numerical calculations based on a Heisenberg model reproduce both zero-field C and M data, thus placing Ce 4 Pt 12 Sn 25 in the weak exchange coupling J Ͻ J c limit of the Doniach diagram, with a very small Kondo scale T K Ӷ T N . Magnetic field suppresses the AFM state at H ‫ء‬ Ϸ 0.7 T, much more effectively than expected from the Heisenberg model, indicating additional effects possibly due to frustration or residual Kondo screening.

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Scaling the Kondo lattice

Cited by 217 publications

References 30 publications

Solution growth of Ce–Pd–In single crystals: Characterization of the heavy-fermion superconductor Ce2PdIn8

Solution growth of Ce–Pd–In single crystals: Characterization of the heavy-fermion superconductor Ce2PdIn8

Fermi-surface evolution in Yb-substituted CeCoIn5

Thermal and magnetic properties of the low-temperature antiferromagnetCe4Pt12Sn25

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