High-pressure effects on nonfluorinated BiS2-based superconductors La1–xMxOBiS2 ( M=Ti and Th)

Fang, Y.; Yazici, D.; Jeon, I.; Maple, M. B.

doi:10.1103/PhysRevB.96.214505

High-pressure effects on nonfluorinated ${BiS}_{2}$ -based superconductors ${La}_{1 - x} M_{x} {OBiS}_{2}$ ( $M = Ti$ and Th)

Journal Article · Fri Dec 15 00:00:00 EST 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.96.214505· OSTI ID:1579948

Fang, Y. ^[1]; Yazici, D. ^[2]; Jeon, I. ^[2]; Maple, M. B. ^[2]

Univ. of California, San Diego, La Jolla, CA (United States); University of California, San Diego
Univ. of California, San Diego, La Jolla, CA (United States)

Layered LnOBiS₂ (where Ln represents a lanthanide element) compounds with Ln = La, Ce, Pr, Nd, and Yb can be rendered conducting and superconducting via two routes, substitution of F for O or the tetravalent ions Ti, Zr, Hf, and Th for trivalent Ln ions. Electrical resistivity measurements on nonfluorinated La_0.80Ti_0.20OBiS₂ and La_0.85Th_0.15OBiS₂ superconductors were performed between ~1.5 and 300 K and under pressure up to 2.4 GPa. For both compounds, the superconducting transition temperature T_c, which is ~2.9K at ambient pressure, gradually increases with pressure to 3.2–3.7 K at ~1GPa, above which it is suppressed and the superconducting transitions become very broad. Measurements of the normal-state electrical resistivity of the two compounds reveal discontinuous changes in the resistivity as a function of pressure at ~0.6GPa. Surprisingly, above 1.3 GPa, semiconductinglike behavior reappears in La_0.80Ti_0.20OBiS₂. This paper reveals a new high-pressure phase of La_1-xM_xOBiS₂ containing the tetravalent ions M=Ti, Th which does not favor superconductivity. In contrast, application of pressure to fluorinated LaO_0.5F_0.5BiS₂ produces an abrupt tetragonal-monoclinic transition to a metallic phase with an enhanced T_c. Here, these results demonstrate that the response of the normal and superconducting properties of LaOBiS₂-based compounds depends strongly on the atomic site where the electron donor ions are substituted.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: National Science Foundation; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: FG02-04ER46105; NA0002909

OSTI ID:: 1579948

Alternate ID(s):: OSTI ID: 1413555

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 21 Vol. 96; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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