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| Author | Correa, V. F., P. Pedrazzini, D. G. Franco, A. J. Rosa, B. Rubrecht, N. Haberkorn | ||||
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Low-temperature thermal expansion of the topological material candidates β-PtBi2 and β-PdBi2 | Type | Journal Article | ||
| Year | 2022 | Publication | Physica B – Condensed Matter | Abbreviated Journal | Physica B |
| Volume | 641 | Issue | Pages | 414102 | |
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| Abstract | We report on the low-temperature ($T <$ 120 K) thermal expansion of the bismuth-based topological semimetal $\beta$-PtBi$2$ and topological superconductor $\beta$-PdBi$2$ candidates. The linear thermal-expansion coefficient of tetragonal $\beta$-PdBi$2$ shows a pronounced anisotropy between the $a$- and $c$-axis while the volume thermal-expansion coefficient $\alphaV$($\beta$-PdBi$2$) is considerable larger than $\alphaV$($\beta$-PtBi$2$). The coefficient $\alphaV$($\beta$-PtBi$2$) nearly matches the experimental specific heat, from which a Debye temperature $\thetaD =$ 199 K is obtained. On the other hand, $\alphaV$($\beta$-PdBi$2$) reasonably fits the Debye model with $\thetaD =$ 138 K, extracted from the low-temperature specific heat. An almost constant Gr\"uneisen parameter $\Gamma \approx$ 2 is obtained for both compounds. No magnetostriction is observed in any of both compounds up to $\mu0 H =$ 16 T. We compare our results with other Bi-based topological materials. |
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| Call Number | BT @ victor.correa @ | Serial | 882 | ||
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