Evidence for unconventional superconductivity and nontrivial topology in PdTe

Chapai, Ramakanta; Reddy, P. V. Sreenivasa; Xing, Lingyi; Graf, David E.; Karki, Amar B.; Chang, Tay-Rong; Jin, Rongying

doi:10.1038/s41598-023-33237-5

Title: Evidence for unconventional superconductivity and nontrivial topology in PdTe

Journal Article · Wed Apr 26 00:00:00 EDT 2023 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-023-33237-5· OSTI ID:1971560

Chapai, Ramakanta; Reddy, P. V. Sreenivasa; Xing, Lingyi; Graf, David E.; Karki, Amar B.; Chang, Tay-Rong; Jin, Rongying

Abstract PdTe is a superconductor with T _c ~ 4.25 K. Recently, evidence for bulk-nodal and surface-nodeless gap features has been reported in PdTe. Here, we investigate the physical properties of PdTe in both the normal and superconducting states via specific heat and magnetic torque measurements and first-principles calculations. Below T _c , the electronic specific heat initially decreases in T ³ behavior (1.5 K < T < T _c ) then exponentially decays. Using the two-band model, the superconducting specific heat can be well described with two energy gaps: one is 0.372 meV and another 1.93 meV. The calculated bulk band structure consists of two electron bands (α and β) and two hole bands (γ and η) at the Fermi level. Experimental detection of the de Haas-van Alphen (dHvA) oscillations allows us to identify four frequencies ( F _α = 65 T, F _β = 658 T, F _γ = 1154 T, and F _η = 1867 T for H // a ), consistent with theoretical predictions. Nontrivial α and β bands are further identified via both calculations and the angle dependence of the dHvA oscillations. Our results suggest that PdTe is a candidate for unconventional superconductivity.

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Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012432; MOST111-2628-M-006-003-MY3

OSTI ID:: 1971560

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Vol. 13 Journal Issue: 1; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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