Coherence Kondo gap in CeNiSn and CeRhSb

Takabatake, Toshiro; Nakamoto, G.; Tanaka, Hiroaki; Bandô, Yoshio; Fujii, H.; Nishigori, S.; Goshima, H.; Suzuki, Takashi; Fujita, Toshizo; Oguro, I.; Hiraoka, Tomoki; Malik, S. K.

doi:10.1016/0921-4526(94)91868-6

Cited by 50 publications

(20 citation statements)

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“…The transport gap is approximately 10 K and is unstable against any change in 4 f-conduction electron hybridization caused by alloying [25,26] and application of pressure [27,21,28] or magnetic field [18,29]. In Fig.…”

Section: Electronic Structure Of Cenisn and Cerhsbmentioning

confidence: 99%

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Band Gap Stability in Kondo Insulators

2000

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We report on magnetic measurements and electronic structure investigations of CeNiSn and CeRhSb. Both belong to the group of Kondo insulators. The magnetic susceptibility shows the nonmagnetic ground state for these compounds and their alloys. The 3d X-ray photoemission spectroscopy spectra show evidence for the mixed valence state of Ce in CeRhSb alloys, as also seen for CeNiSn, whereas the spectra for the La substituted (Ce,La)NiSn compounds show only evidence for a pure Ce 3+ ground state. We suggest the presence of Kondo-hole states in (Ce,La)RhSb. The location of the pseudogap in CeRhSb varies with the number of free electron, the valence of Ce, and the f-d hybridization. We discuss the similar crystallographic properties and the closed electronic structures of ZrNiSn-type semi-Heusler alloys and CeNiSn-type Kondo insulators.

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Section: Electronic Structure Of Cenisn and Cerhsbmentioning

confidence: 99%

“…Previous alloying studies show that the energy gap in Ce-based Kondo insulators is very sensitive to the partial substitution of either Ce by La or Ni (Rh) by a transition metal [17][18][19][20]. The replacing of the Ce ions by trivalent ions leads to ordinary metals.…”

Section: Introductionmentioning

confidence: 99%

Band Gap Stability in Kondo Insulators

2000

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“…Among the other compounds of RNiSn series, CeNiSn is found to show some extraordinary properties. Many experiments [234,235] in CeNiSn suggest that a pseudo-gap opens in the Kondo state at low temperatures. The heat capacity data (C/T vs. T) show a change in slope around 0.5 K, indicating some additional structure inside the pseudo gap of density of sates (DOS) around Fermi energy (EF) [235].…”

Section: Rnix Compoundsmentioning

confidence: 99%

Review on magnetic and related properties of RTX compounds

Gupta

Суреш

2015

Journal of Alloys and Compounds

253

124

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RTX (R=rare earths, T= 3d/4d/5d, transition metals such as Sc, Ti, Mn, Fe, Co, Ni, Cu, Ru, Rh, Pd, Ag, Os, Ir, Pt, Au, and X=p-block elements such as Al, Ga, In, Si, Ge, Sn, As, Sb, Bi) series is a huge family of intermetallics compounds. These compounds crystallize in different crystal structures depending on the constituents. Though these compounds have been known for a long time, they came to limelight recently in view of the large magnetocaloric effect (MCE) and magnetoresistance (MR) shown by many of them. Most of these compounds crystallize in hexagonal and tetragonal crystal structures. Some of them show crystal structure modification with annealing temperature; while a few of them show iso-structural transition in the paramagnetic regime. Their magnetic ordering temperatures vary from very low temperatures to temperatures well above room temperature (~510 K). Depending on the crystal structure, they show a variety of magnetic and electrical properties.These compounds have been characterized by means of a variety of techniques/measurements such as x-ray diffraction, neutron diffraction, magnetic properties, heat capacity, magnetocaloric properties, electrical resistivity, magnetoresistance, thermoelectric power, thermal expansion, Hall effect, optical properties, XPS, Mössbauer spectroscopy, ESR, μSR, NMR, NQR etc. Some amount of work on theoretical calculations on electronic structure, crystal field interaction and exchange interactions has also been reported. The interesting aspect of this series is that they show a variety of physical properties such as Kondo effect, heavy fermion behavior, spin glass state, intermediate valence, superconductivity, multiple magnetic transitions, metamagnetism, large MCE, large positive as well as negative MR, spin orbital compensation, magnetic polaronic behavior, pseudo gap effect etc.Except Mn, no other transition metal in these compounds possesses considerable magnetic moments.Because of this RMnX compounds in general have high ordering temperatures. Interstitial modification using hydrogen and nitrogen is found to alter their crystal structures and magnetic properties considerably. RTX compounds also show interesting pressure effects on their structural and magnetic properties. In summary, these compounds show variety of physical properties over a wide range of temperatures. This review is intended to cover all the important results obtained in this family, particularly in the last few years.

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“…The measurements performed on a single-crystalline sample showed a large anisotropy in the coefficients of linear thermal expansion (orthorhombic crystal structure), but the coefficient of volume expansion a v showed no specific 0921-4526/95/$09.50 © 1995 Elsevier Science B.V. All rights reserved SSDI 0921-4526(94)00597-4 structure upon opening of the gap. However, the a v / T versus T curve revealed a broad maximum centered at Tg, just as is the case for c/T versus T [1,2]. In this paper, we report thermal-expansion measurements of the analogous compound CeRhSb in the temperature range 1.5-200 K. As no single-crystalline sample was available, the measurements were performed on a polycrystal.…”

Section: Introductionmentioning

confidence: 99%

“…The most striking property of these materials is the opening of an energy gap in the quasiparticle excitation spectrum. Of particular interest are the cerium compounds CeNiSn and CeRhSb, where a small energy gap (za-4-10 K) opens at low temperatures (Tg-10 K) in the enhanced density of states [1,2]. Evidence for the insulating ground state is inferred from the transport, magnetic and thermal properties below Tg, specifically from the strong increase in the electrical resistivity, the sudden increase in the absolute value of the Hall coefficient (IRHI) and the gradual decrease in the specific heat divided by temperature (c/T).…”

Section: Introductionmentioning

confidence: 99%

Thermal expansion of the Kondo insulator CeRhSb

Nolten

Visser

Kayzel

et al. 1995

Physica B: Condensed Matter

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Thermal expansion of the Kondo insulator CeRhSbNolten, A.J.; de Visser, A.; Kayzel, F.E.; Franse, J.J.M.; Tanaka, H.; Takabatake, T. Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. AbstractThe linear coefficients of thermal expansion, a(T), of the Kondo insulator CeRhSb and its non-f-electron analog LaRhSb have been measured on polycrystalline samples in the temperature range 1.5-200 K. After subtracting the phonon contribution (0 o = 260 K), the f-electron contribution to the thermal expansion, am(T), shows two distinct features, a broad maximum is centered at 125 K, while a large shoulder appears below 40 K. In a plot of t~., / T versus T, a maximum appears at the temperature where the energy gap opens, Tg = 10 K. For T < Tg, a.,(T) follows an aT + bT 2 law, which is compatible with a description of the energy gap vanishing on lines at the Fermi surface.

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Coherence Kondo gap in CeNiSn and CeRhSb

Cited by 50 publications

References 19 publications

Band Gap Stability in Kondo Insulators

Band Gap Stability in Kondo Insulators

Review on magnetic and related properties of RTX compounds

Thermal expansion of the Kondo insulator CeRhSb

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