Pseudogap due to Coherence Kondo Effect in CeNiSn and CeRhSb

Nishigori, S.; Goshima, H.; Suzuki, Takashi; Fujita, Toshizo; Nakamoto, G.; Tanaka, Hiroaki; Takabatake, Toshiro; Fujii, H.

doi:10.1143/jpsj.65.2614

Cited by 70 publications

(37 citation statements)

References 27 publications

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“…The first two series concern solid solutions with the same valence electron concentration. The nickel atoms in CeNiSn have been substituted by palladium [199,256,257] and platinum [258][259][260][261][262][263][264]. In the solid solution CeNi 1−x Pd x Sn one observes a decrease of the Néel temperature of CePdSn from 7.5 K to around 4 K for a composition CeNi 0.4 Pd 0.6 Sn [256].…”

Section: Solid Solutionsmentioning

confidence: 99%

Cerium intermetallics with TiNiSi-type structure

Janka

Niehaus

Pöttgen

et al. 2016

Zeitschrift Für Naturforschung B

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Intermetallic compounds with the equiatomic composition CeTX that crystallize with the orthorhombic TiNiSi-type structure can be synthesized with electronrich transition metals (T) and X = Zn, Al, Ga, Si, Ge, Sn, As, Sb, and Bi. The present review focusses on the crystal chemistry and chemical bonding of these CeTX phases and on their physical properties, 119 Sn and 121 Sb Mössbauer spectra, high-pressure effects, hydrogenation reactions and the formation of solid solutions in order to elucidate structure-property relationships. This paper is the final one of a series of four reviews on equiatomic intermetallic cerium compounds [Part I

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Section: Solid Solutionsmentioning

confidence: 99%

Cerium intermetallics with TiNiSi-type structure

Janka

Niehaus

Pöttgen

et al. 2016

Zeitschrift Für Naturforschung B

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“…The values of activation energy  estimated by the least-square fitting are also listed in Table I. As similar to | P |,  decreases with increasing x, indicating that the semiconducting behavior in CeRu 2 Al 10 is sensitive to both J cf and the impurity, as found in Kondo semimetals such as CeNiSn [1,5]. Below T N , a hump at 22 K is also suppressed with x.…”

Section: Methodsmentioning

confidence: 62%

“…For the orthorhombic Kondo semiconductor CeNiSn introducing 3d holes and electrons in CeNi 1-x Co x Sn and CeNi 1-y Cu y Sn, respectively, collapses the hybridization gap at x, y≥0.05. On further doping, CeNi 1-x Co x Sn undergoes a valence transition at x≥0.35, while CeNi 1-y Cu y Sn displays a long-range magnetic order at y≥0.08 [1,[5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Effects of Ga and Si Substitutions for Al in CeRu₂Al₁₀ on the Unusual Antiferromagnetic Order in the Kondo Semiconducting State

Muro¹,

Hida²,

Fukuhara³

et al. 2014

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

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We have studied the effects of Ga and Si substitutions on the antiferromagnetic (AF) Kondo semiconductor CeRu 2 Al 10 which orders at rather high temperature T N = 27 K. In CeRu 2 Al 10-x Ga x , the semiconducting behavior is suppressed with increasing x up to x = 0.8. Thereby, T N is suppressed down to 24.5 K. The Si substitution changes the AF state more strongly. In fact, T N decreases to 23 K for CeRu 2 Al 9.9 Si 0.1 , probably due to the doping of 3p electrons. The magnetic susceptibility along the orthorhombic a-axis exhibits a sharp peak at T N below which those along the b-and c-axes do not decrease. This change can be explained by the reorientation of the ordered moments from the c-axis in CeRu 2 Al 10 to the a-axis in CeRu 2 Al 9.9 Si 0.1 . These findings indicate the importance of electron density for the unusual AF order in CeRu 2 Al 10 .

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“…The integrated intensity of the peak provides a measure of the Fermi-surface radii. This form of the density of states has been inferred from measurements of the resistivity and specific heat on CeNiSn [25,26]. The mean-field dynamic susceptibility χ (0) (q, ω) shows nesting near (1, 1, 1) between the shallow electron and hole pockets, as seen in the right panel of fig.(3).…”

Section: (9) Semiconducting Casementioning

confidence: 68%

“…Recently, spin-excitons were observed in the material CeFe 2 Al 10 [22,23] which, unlike the heavy-fermion semiconductors, only shows a pseudogap in the density of states. Therefore, like CeNiSn [24,25,26], this material is a member of the class of heavy-fermion semimetals. The relation of the nesting vector in CeFe 2 Al 10 to the ordering wavevector in the related antiferromagnetic compound CeOs 2 Al 10 strengthens the identification of the spin-exciton as a precursor magnetic fluctuation.…”

Section: Introductionmentioning

confidence: 99%

Spin-excitons in heavy-fermion semimetals

Riseborough

Magalhães

2016

Journal of Magnetism and Magnetic Materials

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Spin-excitons are sharp and dispersive magnetic fluctuations in paramagnetic semiconductors where the dispersion relation lies within the semiconducting gap. Spin-excitons are found in the vicinity of magnetic quantum critical points in semiconductors, much the same as antiparamagnons are precursor fluctuations for quantum critical points in metals.Here we show that this concept of spin-exciton excitations can be extended to heavy-fermion semimetals and provides a natural explanation of the magnetic modes found by inelastic neutron scattering experiments on paramagnetic CeFe2Al10.

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Pseudogap due to Coherence Kondo Effect in CeNiSn and CeRhSb

Cited by 70 publications

References 27 publications

Cerium intermetallics with TiNiSi-type structure

Cerium intermetallics with TiNiSi-type structure

Effects of Ga and Si Substitutions for Al in CeRu₂Al₁₀ on the Unusual Antiferromagnetic Order in the Kondo Semiconducting State

Spin-excitons in heavy-fermion semimetals

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Pseudogap due to Coherence Kondo Effect in CeNiSn and CeRhSb

Cited by 70 publications

References 27 publications

Cerium intermetallics with TiNiSi-type structure

Cerium intermetallics with TiNiSi-type structure

Effects of Ga and Si Substitutions for Al in CeRu2Al10 on the Unusual Antiferromagnetic Order in the Kondo Semiconducting State

Spin-excitons in heavy-fermion semimetals

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Effects of Ga and Si Substitutions for Al in CeRu₂Al₁₀ on the Unusual Antiferromagnetic Order in the Kondo Semiconducting State