Fizika Nizkikh Temperatur: Volume 46, Number 10 (October 2020), p. 1186-1192    ( to contents , go back )

Features of temperature dependences of electrical resistance in GdxPb1–xMo6S8 superconductors (x = 0.5, 0.7, and 0.9)

А. V. Terekhov1,2, I. V. Zolochevskii1, L. A. Ischenko1, A. Zaleski2, E. P. Khlybov3, and S. A. Lachenkov4

1B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine Kharkiv 61103, Ukraine
E-mail: terekhov.andrii@gmail.com

2W. Trzebiatowski Institute for Low Temperatures and Structure Research PAS, Wroclaw 50-422, Poland

3L.F. Vereshchagin Institute for High-Pressure Physics, RAN, Troitsk 142190, Russia

4Baikov Institute of Metallurgy and Materials Science, RAS, Moscow,119334, Russia
pos Анотація:

Received June 20, 2020, published online August 21, 2020

Abstract

Dependences of the electrical resistance vs temperature ρ(T) and applied field ρ(H) in the temperature range of 2–300 K and magnetic fields up to 9 T in GdxPb1–xMo6S8 compounds (x = 0.5, 0.7, 0.9) were studied for the first time. The ρ(T) features (maximum and minimum for Gd0.9Pb0.1Mo6S8 and an inflection for Gd0.7Pb0.3Mo6S8) in some temperature ranges were found in the absence of external magnetic field. For Gd0.5Pb0.5Mo6S8 the ρ(T) dependence is monotonic in the entire studied temperature range. The presence of a small positive magnetoresistance (up to 2 %), which is maximum at the temperature of the features, has been established. It is shown that the dependence M(T) in the studied temperature range, there are no features associated with long-range magnetic transformations. It has been suggested that the features on ρ(Т) in Gd0.9Pb0.1Mo6S8 and Gd0.7Pb0.3Mo6S8 can be due to the restructuring of the band structure and the appearance of two charge carrier channels responsible for the semiconductor and metal behavior of the electrical resistance temperature dependences.

Key words: superconducting triple, molybdenum temperature and magnetic field dependence, GdxPb1–xMo6S Download 920462 byte View Contents