Specific heat of the Kondo model

Desgranges, H.-U.; Schotte, K. D.

doi:10.1016/0375-9601(82)90481-9

Cited by 238 publications

(112 citation statements)

References 7 publications

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“…Similar behavior has been observed in a number of other Ce compounds, e.g., CeCu 5.9 Au 0.1 , 28 CeCu 2 Si 2 , 29 and ͑La, Ce͒Al 2 . 29,30 As seen in the inset of Fig. 2͑a͒, S mag reaches 1.0R ln 2 independently of applied fields up to 3 T, although the ground state and the shape of the specific-heat anomaly both vary strongly with applied field, reflecting a twofold degeneracy of the CEF doublet.…”

Section: Resultsmentioning

confidence: 86%

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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Section: Resultsmentioning

confidence: 86%

Thermal and magnetic properties of the low-temperature antiferromagnetCe4Pt12Sn25

et al. 2010

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“…As can be seen, the entropy of the Ce2-sublattice, S Ce2 , liberated at T 1 is found to be 0.5R ln 2 indicating that the ordered moment is lowered by Kondo interactions. The corresponding sublattice Kondo temperature is T K2 ≃ 3 K (S Ce2 = 0.65R ln 2) [21]. The large S Ce2 below T 1 as well as the fact that T K2 is of the same order of magnitude as T 1 would suggest the presence of local moments.…”

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confidence: 99%

Magnetism, superconductivity, and quantum criticality in the multisite cerium heavy-fermion compoundCe3PtIn11

et al. 2015

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The properties of the novel heavy fermion superconductor Ce3PtIn11 are investigated by thermodynamic and transport measurements at ambient and under hydrostatic pressure. At ambient pressure the compound exhibits two successive magnetic transitions at T1 ≃ 2.2 K and TN ≃ 2 K into antiferromagnetically ordered states and enters into a heavy fermion superconducting phase below Tc ≃ 0.32 K. The coexistence of long-range magnetic order and superconductivity is discussed in the context of the existence of the two crystallographically inequivalent Ce-sites in the unit cell of Ce3PtIn11. The experimental data allow us to construct the pressure-temperature phase diagram.

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“…Sharp heat capacity anomaly at T N and the possible absence of short range order facilitate the use of the theory [17] and with the experimental value of S mag , we estimate a value of 5 K for the Kondo temperature of Yb 2 Fe 3 Si 5 . However, accurate estimation requires inelastic scattering data.…”

Section: B Resistivity Studiesmentioning

confidence: 59%

“…The entropy has been calculated by Desgranges and Schotte using the Bethe ansatz for a spin-1/2 Kondo model [17]. Sharp heat capacity anomaly at T N and the possible absence of short range order facilitate the use of the theory [17] and with the experimental value of S mag , we estimate a value of 5 K for the Kondo temperature of Yb 2 Fe 3 Si 5 .…”

Section: B Resistivity Studiesmentioning

confidence: 89%

Antiferromagnetic ordering in the Kondo lattice systemYb2Fe3Si

et al. 2002

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Compounds belonging to the R 2 Fe 3 Si 5 series exhibit unusual superconducting and magnetic properties. Although a number of studies have been made on the first reentrant antiferromagnet superconductor Tm 2 Fe 3 Si 5 , the physical properties of Yb 2 Fe 3 Si 5 are largely unexplored. In this work, we attempt to provide a comprehensive study of bulk properties such as, resistivity, susceptibility and heat-capacity of a well characterized polycrystalline Yb 2 Fe 3 Si 5 .Our measurements indicate that Yb 3+ moments order antiferromagnetically below 1.7 K. Moreover, the system behaves as a Kondo lattice with large Sommerfeld coefficient (γ) of 0.5 J/Yb mol K 2 at 0.3 K, which is well below T N . The absence of superconductivity in Yb 2 Fe 3 Si 5 down to 0.3 K at ambient pressure is attributed to the presence of the Kondo effect.Ms number

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Specific heat of the Kondo model

Cited by 238 publications

References 7 publications

Thermal and magnetic properties of the low-temperature antiferromagnetCe4Pt12Sn25

Thermal and magnetic properties of the low-temperature antiferromagnetCe4Pt12Sn25

Magnetism, superconductivity, and quantum criticality in the multisite cerium heavy-fermion compoundCe3PtIn11

Antiferromagnetic ordering in the Kondo lattice systemYb2Fe3Si

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