Electronic Orders Induced by Kondo Effect in Non-Kramersf-Electron Systems

Kuramoto, Yoshio; Hoshino, Shintaro; Otsuki, Junya

doi:10.1143/jpsjs.80sa.sa018

Cited by 11 publications

(3 citation statements)

References 30 publications

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“…Nevertheless, this problem was considered in [71] for the case of PrSn 3 and its solid solutions with LaSn 3 . As pointed out by Kuramoto et al [72], the CF singlet ground M A N U S C R I P T…”

Section: Transport Properties 251 Electrical Resistivitymentioning

confidence: 83%

Anomalous rattling and single crystalline properties of the caged compound URu2Al10

Troć

Pasturel

Samsel‐Czekała

et al. 2018

Journal of Alloys and Compounds

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We report on an experimental single-crystal study of URu 2 Al 10 , crystallizing in the YbFe 2 Al 10 type orthorhombic structure, supplemented by the results of crystal field and band structure calculations. We investigated the magnetic, thermal and transport properties of this caged-type compound. Based on the local character of the 5f 2 −electron configuration of the U 4+ ion in URu 2 Al 10 , the effective crystal field (CF) potential in the intermediate coupling form was estimated using the CF level scheme, composed only of singlets. This was carried out in a similar manner to that reported for UFe 2 Al 10 [Phys. Rev. B 92 (2015) 104427]. The obtained scheme satisfactorily reproduces both the magnetic susceptibility (measured along the three main crystallographic directions) and the Schottky-type anomaly of the specific heat. The latter was estimated using the specific heat data of ThRu 2 Al 10 as a phonon reference. In addition, the strong anisotropic behavior of the Seebeck coefficient measured along the three principal directions, and its low-temperature pronounced maxima, have been approximately explained by the CF effect. The latter dominates in the S-shaped temperature dependencies of the electrical resistivity, measured using the current flowing along the three main axes. However, the magnetoresistivity reveals an anisotropic electronic structure that could originate from a c-f hybridization effect in an orthorhombic unit cell. This gives rise to the typical metallic character of URu 2 Al 10 , as is also the case for UFe 2 Al 10 . This behavior underlines the dual character of the 5f-electrons in these ternaries. In turn, the presence of low-frequency Einstein modes reflects the presence of regular rattling of the U 4+ ion located in the [Ru 4 Al 16 ] cage. This rattling is, however, disturbed at low temperatures by applying an external magnetic field which causes strong scattering of the experimental electrical resistivity points. This effect is also anisotropic, as proved by a comparison of the resistivity results determined at zero and 9 T for a singlecrystalline sample of URu 2 Al 10 . The above effect also exists for isostructural UFe 2 Al 10 , but its anisotropy is less apparent.

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Section: Transport Properties 251 Electrical Resistivitymentioning

confidence: 83%

Anomalous rattling and single crystalline properties of the caged compound URu2Al10

Troć

Pasturel

Samsel‐Czekała

et al. 2018

Journal of Alloys and Compounds

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“…Then the non-Kramers f -electron state is naturally described. We have demonstrated, 11,12 in the borderline case as in PrFe 4 P 12 , an exotic scalar order can be realized that consists of alternating sites of Kondo and CEF singlets.…”

Section: Introductionmentioning

confidence: 78%

Composite Orders and Lifshitz Transition of Heavy Electrons

Kuramoto

Hoshino

2014

J. Phys. Soc. Jpn.

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Magnetic and other unconventional electronic orders are discussed for heavy electrons. In addition to the ordinary Kondo lattice, we consider non-Kramers systems taking the two-channel Kondo lattice, and another lattice that consists of a singlet-triplet f2 configuration. The latter gives a scalar order with staggered sublattices of crystalline-electric-field (CEF) and Kondo singlets, which accounts for the observed order in PrFe4P12. In the two-channel Kondo lattice, an odd-frequency pairing is realized that becomes degenerate at half-filling with a composite order involving both localized and conduction electrons. The degeneracy is interpreted in terms of a hidden SO(5) symmetry. For the ordinary Kondo lattice with exchange interaction J, we take insulating ground states as reference. The metallic states are approached by infinitesimal doping of carriers either from the Kondo insulator or from the antiferromagnetic insulator. By adding intersite exchange we find that location of the band extremum of the heavy band depends on the value of J. The change of J gives topological change of the Fermi surface, which corresponds to a generalized version of the Lifshitz transition, and occurs separately from the quantum critical point of the antiferromagnetic order.Comment: 8 pages, 5 figures, presentation at SCES2013 conferenc

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“…Recently, a theoretical study suggests that the low-temperature phase of PrFe 4 P 12 is attributed to the Kondo-singlet sites and localized CF-singlet sites form staggered order below T A [15,16]. Above T A , the HF state attributes to the Kondo effect with the low-energy quasi-quartet crystal-field-splitting (CF) of 4f electrons.…”

Section: Introductionmentioning

confidence: 99%

Growth of Single Crystal and Effects of Electron Doping in Filled Skutterudite Compound PrFe4P12

Hao

Iwasa

Liu

et al. 2013

AMR

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PrFe4P12shows an anomalously phase transition from a heavy fermion (HF) state to a non-magnetic ordered state. We prepared single crystal sample of Pr (Fe1-xCox)4P12by Sn-flux method to investigate the effects of electron doping. The distinct change of magnetic property was observed. The phase transition of PrFe4P12rapidly disappears when doped rate x=0.03. This result indicates that the d-electron plays an important role in formation of Low-temperutre phase and HF state of PrFe4P12.

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Electronic Orders Induced by Kondo Effect in Non-Kramersf-Electron Systems

Cited by 11 publications

References 30 publications

Anomalous rattling and single crystalline properties of the caged compound URu2Al10

Anomalous rattling and single crystalline properties of the caged compound URu2Al10

Composite Orders and Lifshitz Transition of Heavy Electrons

Growth of Single Crystal and Effects of Electron Doping in Filled Skutterudite Compound PrFe<sub>4</sub>P<sub>12</sub>

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