Anomalous Transport Behavior in Quantum Magnets

Belitz, D.; Kirkpatrick, T. R.

doi:10.3390/condmat3040030

Cited by 1 publication

(1 citation statement)

References 63 publications

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“…For CoSbTe, on the other hand, ρ approximately follows T 1.5 rather than T at low temperatures (5-70 K), see figure 6(c). Notably, the T or T 1.5 dependence of ρ as seen for CoSbSe and CoSbTe is indicative of a non-Fermi-liquid (NFL) like behavior [26][27][28]. In conventional metals electron-electron and electron-phonon scattering dominates the conduction.…”

Section: Thermoelectric Transport Propertiesmentioning

confidence: 99%

Isovalent substitution effects on thermoelectric transport properties of CoSbX (X = S, Se, Te) system

Kousar

Srivastava

Karppinen

et al. 2019

J. Phys.: Condens. Matter

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We demonstrate a transition of the thermoelectric transport characteristics in the CoSbX (X = S, Se or Te) systems from a p -type semiconductor to metallic conductor with increasing size of the X constituent. From DFT calculations CoSbS is found as an indirect semiconductor with band-gap of 0.38 eV, while both CoSbSe and CoSbTe appear as metals. For the two metals, the calculations reveal two degenerate electron pockets (located near the U point for CoSbSe and near the T point for CoSbTe) and a hole pocket along the X-Γ-Y points. In line with the theoretical predictions, electrical transport measurements reveal semiconductingtype temperature dependence of resistivity and positive room-temperature Seebeck coefficient (+570 µV K −1 ) for CoSbS, and metallic-type temperature dependence for CoSbSe and CoSbTe with negative Seebeck coefficient (−14 and −7.5 µV K −1 ). The Hall coefficient is positive for CoSbS(Se) and negative for CoSbTe. Room-temperature charge carrier densities were estimated at 3 × 10 18 /~10 21 /~10 22 cm −3 for CoSbS/CoSbSe/CoSbTe. Thermal conductivity is dominated by lattice rather than electronic contribution, the RT value being of the roughly same magnitude for all the three compounds. The temperature dependence of thermal conductivity bear resemblance to a typical semiconductor in the case of CoSbS and to a metallic alloy for CoSbSe and CoSbTe.

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Section: Thermoelectric Transport Propertiesmentioning

confidence: 99%