Effect of pressure on the parameters of the superconducting transition in In-doped PbzSn1−zTe semiconducting solid solutions
Year: 2015
Type: article
Abstract: The effect of hydrostatic pressures up to 10 kbar and lead content on the superconducting and electrical characteristics of indium-doped (5 at. %) PbzSn1−zTe semiconducting solid solutions is studied. Experimental correlations are found for these pressure dependences. When the pressure is raised to P = 6.8 kbar in this material with a lead content z = 0.45 the superconductivity threshold increases to Tc = 1.7 K, which is typical of the compound with z = 0.05 at atmospheric pressure. Increasing the hydrostatic pressure P > 3 kbar in (Pb0.05Sn0.95)0.95In0.05Te causes Tc to fall below 1 K. These features, along with the bell-shaped Tc(P) curve for z = 0.3, are explained by a shift in the energy EIn of the quasilocal states and the Fermi level which is stabilized by them, from the L-band into the Σ-valence band with a high density of states (most noticeable for z = 0.45). A concentration threshold for emergence of the Fermi level from the Σ-valence band with increasing lead content was found using Hall effect measurements at T = 77 K.
Source: Low Temperature Physics
DOI: 10.1063/1.4908193
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2000429449