Influence of In-induced resonant level on the normal-state and superconducting properties of Sn<sub>1.03</sub>Te - Université de Lorraine Access content directly
Journal Articles Physical Review B Year : 2022

Influence of In-induced resonant level on the normal-state and superconducting properties of Sn1.03Te

Shantanu Misra
Sylvie Migot
Jaafar Ghanbaja
Anne Dauscher
Bertrand Lenoir

Abstract

Normal-state transport properties (2–300 K) of the polycrystalline series Sn1.03−δ−xInxTe (0 ≤ x ≤ 0.07; δ ≤ 0.0025) were investigated by means of electrical resistivity, thermopower, Hall effect, and thermal conductivity measurements. The distortion of the valence-band structure by the In-induced resonant level (RL) has a profound influence on the evolution of the normal-state properties with x and on the emergence of superconductivity evidenced by specific-heat measurements down to 0.35 K. In addition to a nearly 40-fold increase in the residual electrical resistivity ρ0 on going from x = 0.0 to 0.05, the thermopower α shows a nonlinear, complex behavior as a function of both temperature and x. While Hall measurements indicate a dominant holelike response across the entire composition and temperature ranges, α changes sign below about 100 K and remains negative down to 5 K for 0.0015 ≤ x ≤ 0.0045. Additional measurements under magnetic fields μ0H of up to 14 T further shows that α(μ0H) gradually shifts towards positive values, suggestive of a dominant holelike contribution to α. Superconductivity emerges for x = 0.02 at a critical temperature Tc = 0.67 K, with Tc increasing with x to reach 1.73 K for x = 0.07. The variations in the superconducting parameters with x, notably the specific-heat jump at Tc, confirm the results reported in prior studies and suggests a nontrivial role of the RL on the electron-phonon coupling strength. The striking similarities between this series and the canonical resonant system Pb1−xTlxTe provide an excellent experimental opportunity to gain a deeper understanding of the close interplay between resonant level, anomalous transport properties, and superconductivity.
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Dates and versions

hal-03969519 , version 1 (17-02-2023)

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Shantanu Misra, Bartlomiej Wiendlocha, Janusz Tobola, Petr Levinský, Jiří Hejtmánek, et al.. Influence of In-induced resonant level on the normal-state and superconducting properties of Sn1.03Te. Physical Review B, 2022, 106 (7), pp.075205. ⟨10.1103/PhysRevB.106.075205⟩. ⟨hal-03969519⟩
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