Universal relationship of the resistivity and specific heat in heavy-Fermion compounds

Kadowaki, K.; Woods, S. B.

doi:10.1016/0038-1098(86)90785-4

Cited by 1,068 publications

(693 citation statements)

References 35 publications

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“…The inset of Fig. 7, whereÃ is plotted against T max 1 , indicates the crossover from the strongly to weakly correlated branches of the Kadowaki-Woods plot [19,20]. A comparison with the helium cell results from Ref.…”

Section: Resultsmentioning

confidence: 78%

Anisotropy, disorder, and superconductivity in CeCu₂Si₂under high pressure

Holmes

Jaccard

Jeevan

et al. 2005

J. Phys.: Condens. Matter

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Abstract. Resistivity measurements were carried out up to 8 GPa on single crystal and polycrystalline samples of CeCu 2 Si 2 from differing sources in the homogeneity range. The anisotropic response to current direction and small uniaxial stresses was explored, taking advantage of the quasi-hydrostatic environment of the Bridgman anvil cell. It was found that both the superconducting transition temperature T c and the normal state properties are very sensitive to uniaxial stress, which leads to a shift of the valence instability pressure P v and a small but significant change in T c for different orientations with respect to the tetragonal c-axis. Coexistence of superconductivity and residual resistivity close to the Ioffe-Regel limit around 5GPa provides a compelling argument for the existence of a valence-fluctuation mediated pairing interaction at high pressure in CeCu 2 Si 2 .

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Section: Resultsmentioning

confidence: 78%

Anisotropy, disorder, and superconductivity in CeCu₂Si₂under high pressure

Holmes

Jaccard

Jeevan

et al. 2005

J. Phys.: Condens. Matter

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“…In the original treatment, Kadowaki and Woods reported a universal value R KW ∼ 10 −5 µΩ cm (mol K 2 mJ −1 ) 2 for all HF compounds. [57] More recently, it has been found that many (but not all) Yb-based HF systems are characterised by R KW values that can be two orders of magnitude smaller than the conventional Kadowaki-Woods ratio value. This result is related to the fact that the ground-state degeneracy of N = 8 for Yb modifies the conventional Kadowaki-Woods ratio so that it becomes R * KW ≈ 1 × 10 Figure 6: (a) The exponent, n, defined in the expression, ρ = ρ 0 +AT n , and calculated as described in the text, is plotted vs. log T .…”

Section: Discussionmentioning

confidence: 99%

Crossover between Fermi liquid and non-Fermi liquid behavior in the non-centrosymmetric compound Yb₂Ni₁₂P₇

Jang¹,

Bd²,

Ho³

et al. 2014

J. Phys.: Condens. Matter

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Abstract.A crossover from a non-Fermi liquid to a Fermi liquid phase in Yb 2 Ni 12 P 7 is observed by analyzing electrical resistivity ρ(T ), magnetic susceptibility χ(T ), specific heat C(T ), and thermoelectric power S(T ) measurements. The electronic contribution to specific heat, C e (T ), behaves as C e (T )/T ∼ − ln(T ) for 5 K < T < 15 K, which is consistent with non-Fermi liquid behavior. Below T ∼ 4 K, the upturn in C e (T )/T begins to saturate, suggesting that the system crosses over into a Fermi-liquid ground state. This is consistent with robust ρ(T )−ρ 0 = AT 2 behavior below T ∼ 4 K, with the power-law exponent becoming sub-quadratic for T > 4 K. A crossover between Fermiliquid and non-Fermi liquid behavior suggests that Yb 2 Ni 12 P 7 is in close proximity to a quantum critical point, in agreement with results from recent measurements of this compound under applied pressure.

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“…Another verification of FL behavior [20] comes from the Kadowaki -Woods (KW) ratio calculated as A/γ 2 , where γ is a Sommerfeld electronic heat capacity coefficient taken from Ref. [6].…”

Section: Electrical Resistivitymentioning

confidence: 99%

Electronic structure and transport properties of CeNi9In2

Kurleto

Starowicz

Goraus

et al. 2015

Solid State Communications

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We investigated CeNi 9 In 2 compound, which has been considered as a mixed valence (MV) system. Electrical resistivity vs. temperature variation was analysed in terms of the model proposed by Freimuth for systems with unstable 4f shell. At low temperature the resistivity dependence is consistent with a Fermi liquid state with a contribution characteristic of electron-phonon interaction. Ultraviolet photoemission spectroscopy (UPS) studies of the valence band did not reveal a Kondo peak down to 14 K. A difference of the spectra obtained with photon energies of low and high photoionization cross sections for Ce 4f electrons indicated that 4f states are located mainly close to the Fermi energy. The peaks related to f 5/2 1 and f 7/2 1 final states cannot be resolved but form a plateau between -0.3 eV and the Fermi energy. X-ray photoemission spectroscopy (XPS) studies were realized for the cerium 3d level. The analysis of XPS spectra within the Gunnarsson-Shönhammer theory yielded a hybridization parameter of 104 meV and non-integer f level occupation, being close to 3. Calculations of partial densities of states were realized by a full potential local orbital (FPLO) method. They confirm that the valence band is dominated by Ni 3d states and are in general agreement with the experiment except for the behavior of f-electrons.

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Universal relationship of the resistivity and specific heat in heavy-Fermion compounds

Cited by 1,068 publications

References 35 publications

Anisotropy, disorder, and superconductivity in CeCu₂Si₂under high pressure

Anisotropy, disorder, and superconductivity in CeCu₂Si₂under high pressure

Crossover between Fermi liquid and non-Fermi liquid behavior in the non-centrosymmetric compound Yb₂Ni₁₂P₇

Electronic structure and transport properties of CeNi9In2

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Universal relationship of the resistivity and specific heat in heavy-Fermion compounds

Cited by 1,068 publications

References 35 publications

Anisotropy, disorder, and superconductivity in CeCu2Si2under high pressure

Anisotropy, disorder, and superconductivity in CeCu2Si2under high pressure

Crossover between Fermi liquid and non-Fermi liquid behavior in the non-centrosymmetric compound Yb2Ni12P7

Electronic structure and transport properties of CeNi9In2

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Product

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Anisotropy, disorder, and superconductivity in CeCu₂Si₂under high pressure

Anisotropy, disorder, and superconductivity in CeCu₂Si₂under high pressure

Crossover between Fermi liquid and non-Fermi liquid behavior in the non-centrosymmetric compound Yb₂Ni₁₂P₇