Valence fluctuations in YbNiAl4 compound

Kowałczyk, A.; Falkowski, M.; Toliński, T.

doi:10.1063/1.3452388

Cited by 18 publications

(10 citation statements)

References 14 publications

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“…2(b)). The fitting parameters are comparable with several other Yb-based intermediate valence compounds [43][44][45]. Therefore, the result indicates that YbCdSn exhibits a strongly correlated electron phenomenon which is valence fluctuation.…”

Section: A Magnetic Susceptibilitysupporting

confidence: 78%

Experimental and theoretical study of the correlated compound YbCdSn: Evidence for large magnetoresistance and mass enhancement

Laha,

Rambabu,

Kanchana

et al. 2020

Preprint

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The unusual features of topological semimetals arise from its nontrivial band structure. The impact of strong electron correlations on the topological states remains largely unexplored in real materials. Here, we report the magnetotransport properties of YbCdSn single crystals. We found two fundamental experimental evidences of electron correlations through magnetic susceptibility and specific heat. The electron correlations in this compound lead to an intermediate valence state and enhance the effective mass of the charge carriers. This correlated state exhibits large nonsaturating magnetoresistance, low carrier density, magnetic field induced metal-semiconductorlike crossover and a plateau in resistivity at low temperatures. This compound also shows a cusplike magnetoconductivity at low magnetic field which indicates the presence of weak antilocalization effect. Our band structure calculations of Yb 2+ state predict YbCdSn to be a topological nodal-line semimetal.

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Section: A Magnetic Susceptibilitysupporting

confidence: 78%

Experimental and theoretical study of the correlated compound YbCdSn: Evidence for large magnetoresistance and mass enhancement

Laha,

Rambabu,

Kanchana

et al. 2020

Preprint

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“…54 The fit presented in Fig. 5 (blue dashed line) has been carried out in the temperature range of 50-800 K according to the formula [54][55][56] χ imp (T ) = C imp /(T + θ imp ) is the Curie-Weiss impurity contribution at low temperatures (<20 K); and χ 0 represents the contribution of conduction-electron paramagnetism.…”

Section: Magnetic Susceptibilitymentioning

confidence: 99%

YbPtGe2: A multivalent charge-ordered system with an unusual spin pseudogap

et al. 2012

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We performed a study of the structural and physical properties of YbPtGe 2 . This compound is a multivalent charge-ordered system presenting an unusual spin pseudogap below 200 K. The crystal structure of YbPtGe 2 is refined from single-crystal and powder high-resolution synchrotron x-ray diffraction data at different temperatures. Analysis of the structural features of YbPtGe 2 , together with a combined study of Yb L III x-ray absorption spectroscopy, magnetic susceptibility χ (T ), thermopower S(T ), and 171 Yb and 195 Pt NMR indicate half of the Yb atoms to be in an intermediate valence state with an electronic configuration close to 4f 13 (Yb 3+ ), while for the remaining Yb atoms the 4f 14 (Yb 2+ ) configuration with almost no valence fluctuations is most likely. A drastic drop of the magnetic susceptibility and a decrease of the isotropic shift 195 K iso (T ) with decreasing temperature in the temperature range of 50-200 K evidence the opening of a spin pseudogap with an activation energy of /k B ∼ 200 K. Surprisingly, transport properties do not show clear evidence for the opening of a charge gap, thus excluding a standard Kondo-insulator scenario. Possible origins for this unusual electronic (valence) behavior are discussed.

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“…The hybridization parameter ∆ 2.5 meV is found for CeNiAl 4 [4]. The above observations show that CeNiAl 4 differs significantly from the isostructural YbNiAl 4 compound, which is a typical fluctuating system [5].…”

Section: Introductionmentioning

confidence: 58%

Electronic Properties of CeNiAl₄ Based on ab initio Calculations and XPS Measurements

et al. 2018

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The CeNiAl4 compound crystallizes in an orthorhombic YNiAl4-type structure with a Cmcm space group. The earlier susceptibility data and X-ray photoelectron spectroscopy (XPS) suggested a localized character of the 4f states in CeNiAl4 with a valence state close to a Ce 3 ion. In this work we present a combined theoretical and experimental study of the electronic structure for the Kondo dense system CeNiAl4 based on the XPS data and ab initio calculations. Using the band structure calculations the theoretical XPS valence band spectra are evaluated. Below the Fermi energy the total density of states contains mainly 3d states of Ni hybridized with Ce 4f states.

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Valence fluctuations in YbNiAl4 compound

Cited by 18 publications

References 14 publications

Experimental and theoretical study of the correlated compound YbCdSn: Evidence for large magnetoresistance and mass enhancement

Experimental and theoretical study of the correlated compound YbCdSn: Evidence for large magnetoresistance and mass enhancement

YbPtGe2: A multivalent charge-ordered system with an unusual spin pseudogap

Electronic Properties of CeNiAl₄ Based on ab initio Calculations and XPS Measurements

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Valence fluctuations in YbNiAl4 compound

Cited by 18 publications

References 14 publications

Experimental and theoretical study of the correlated compound YbCdSn: Evidence for large magnetoresistance and mass enhancement

Experimental and theoretical study of the correlated compound YbCdSn: Evidence for large magnetoresistance and mass enhancement

YbPtGe2: A multivalent charge-ordered system with an unusual spin pseudogap

Electronic Properties of CeNiAl4 Based on ab initio Calculations and XPS Measurements

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Product

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Electronic Properties of CeNiAl₄ Based on ab initio Calculations and XPS Measurements