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Author Correa, V.F.; Pedrazzini, P.; Franco, D.G.; Rosa, A.J.; Rubrecht, B.; Haberkorn, N.
Title 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
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 $\alpha
V$($\beta$-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 $\mu
0 H =$ 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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