Kondo behaviour in magnetic (Ce?La)Pd2Si2

Besnus, M.J.; Braghta, A.; Meyer, A.

doi:10.1007/bf01309419

Cited by 24 publications

(11 citation statements)

References 18 publications

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“…For antiferromagnetic compounds with f 0 < 1, a larger f 0 results in a smaller S(T N ), which may cancel the effect of relocalization. Taking CePd 2 Si 2 as an example, we predict S(T N ) = 0.62R ln 2 using T N = 9.9 K and T * = 40 K [4], quite close to the experimental value of S(T N ) = 0.68R ln 2 [42,43]. This suggests a rough scaling relation between S(T o ) and T o /T * (T o = T c , T N , T L , etc), that can be easily applied to other materials in the future.…”

Section: Ybalsupporting

confidence: 80%

Emergent states in heavy-electron materials

Yang

Pines

2012

Proc. Natl. Acad. Sci. U.S.A.

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We obtain the conditions necessary for the emergence of various low-temperature ordered states (local-moment antiferromagnetism, unconventional superconductivity, quantum criticality, and Landau Fermi liquid behavior) in Kondo lattice materials by extending the two-fluid phenomenological theory of heavy-electron behavior to incorporate the concept of hybridization effectiveness. We use this expanded framework to present a new phase diagram and consistent physical explanation and quantitative description of measured emergent behaviors such as the pressure variation of the onset of local-moment antiferromagnetic ordering at T N , the magnitude of the ordered moment, the growth of superconductivity within that ordered state, the location of a quantum critical point, and of a delocalization line in the pressure/temperature phase diagram at which local moments have disappeared and the heavy-electron Fermi surface has grown to its maximum size. We apply our model to CeRhIn 5 and a number of other heavy-electron materials and find good agreement with experiment.heavy fermion | kondo liquid | spin liquid H eavy-electron materials provide a unique f -electron laboratory for the study of the interplay between localized and itinerant behavior. At comparatively high temperatures, itinerancy emerges as the localized f -electrons collectively reduce their entropy by hybridizing with the conduction electrons to form a new state of matter, an itinerant heavy-electron Kondo liquid that displays scaling (non-Landau Fermi liquid) behavior (1-8). The emergent Kondo liquid coexists with the hybridized spin liquid that describes the lattice of local moments whose magnitude has been reduced by hybridization until one reaches the comparatively low temperatures at which unconventional superconductivity and hybridized local-moment antiferromagnetism compete to determine the ground state of the system over a wide regime of pressures. In practice, the phases often coexist, as experiments on the 115 [CeRhIn 5 (9-11) and CeCoIn 5 (12)] and 127 [CePt 2 In 7 (13)] Kondo lattice materials demonstrate. A major challenge for the heavy-electron community has been finding a consistent framework and simple phenomenological description of their measured emergent behaviors that include the pressure variation of the onset of antiferromagnetic ordering at T N , the growth of superconductivity within that ordered state, the onset of quantum critical behavior, and the growth of the heavy-electron Fermi surface.Although progress has been made on developing a phenomenological theory of Kondo lattice materials (6), we do not yet possess a microscopic theory of the emergence of the Kondo liquid as a new quantum state of matter that displays universal behavior below a characteristic temperature (1-3, 5), T Ã , or a satisfactory general framework for characterizing the conditions necessary for the emergence of the competing low-temperature ordered states, because experiments (4) have shown that the seminal phase diagram proposed by Doniach (14) does not apply t...

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Section: Ybalsupporting

confidence: 80%

Emergent states in heavy-electron materials

Yang

Pines

2012

Proc. Natl. Acad. Sci. U.S.A.

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“…5,6 The crystalfield contribution, observed in the electrical resistivity, the specific heat, 24 and the thermal expansion, confirm the characteristic energy scale of the excited levels. The susceptibility measurements show a rather unusual temperature dependence with a change in the magnetic anisotropy at 50 K. At high temperatures the c axis is the easy axis, while below 50 K the easy direction for the magnetization lies within the basal plane.…”

Section: A Crystal Fieldsmentioning

confidence: 79%

“…An alternative route to reach the quantum critical point is by chemical substitution of one of the elements. 24,[37][38][39] As a general trend the spin fluctuations and the Kondo temperature become strongly enhanced when the antiferromagnetic order is suppressed.…”

Section: Pressure Dependencementioning

confidence: 99%

“…2. A comparison with the linear term at T N (␥Ϸ200 mJ mol Ϫ1 K Ϫ2 ) indicates a significant temperature dependence of the spin fluctuations in the antiferromagnetically ordered state, as expected for the relatively low Kondo temperature of T K Ϸ10 K. 9,24 …”

Section: Specific Heatmentioning

confidence: 99%

“…At the antiferromagnetic transition (T N ϭ8.5 K͒ a jump in the specific heat is observed. A comparison with the specific heat of the nonmagnetic reference system LaPd 2 Si 2 indicates the presence of a crystalfield contribution with a maximum at 90 K. 24 The magnetic contribution of the 4 f electrons at low temperatures is obtained after subtraction of the data for LaPd 2 Si 2 . In the inset of Fig.…”

Section: Specific Heatmentioning

confidence: 99%

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Magnetic excitations in heavy-fermionCePd2Si2

et al. 2000

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We have studied the magnetic interactions of single-crystalline CePd 2 Si 2 by measurements of the electrical resistivity, specific heat, thermal expansion, magnetic susceptibility, and elastic and inelastic neutron scattering. In the paramagnetic phase the system is characterized by Kondo-type spin fluctuations which give rise to a strong quasielastic signal in the inelastic neutron scattering cross section. Below the antiferromagnetic ordering temperature (T N ϭ8.5 K͒, the quasielastic signal coexists with spin-wave excitations. The spin waves are strongly dispersive, with a minimum energy of 0.83 meV at the magnetic zone center kϭ(1/2,1/2,0). The dispersion can be described in terms of a two-sublattice model with a reduced magnetic exchange interaction and a strong damping of the spin waves due to Kondo screening. The volume dependence of the magnetic interactions has been analyzed using the Grüneisen parameters in order to study the magnetic interactions close to the quantum critical point, which is reached at an applied pressure of about 30 kbar.

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Ce-Pd-Si (Cerium - Palladium - Silicon)

Landolt-Börnstein - Group IV Physical Chemistry

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Kondo behaviour in magnetic (Ce?La)Pd2Si2

Cited by 24 publications

References 18 publications

Emergent states in heavy-electron materials

Emergent states in heavy-electron materials

Magnetic excitations in heavy-fermionCePd2Si2

Ce-Pd-Si (Cerium - Palladium - Silicon)

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