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Title: High-pressure effects on nonfluorinated BiS 2 -based superconductors La 1 x M x OBiS 2 ( M = Ti and Th)

Abstract

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 La0.80Ti0.20OBiS2 and La0.85Th0.15OBiS2 superconductors were performed between ~1.5 and 300 K and under pressure up to 2.4 GPa. For both compounds, the superconducting transition temperature Tc, 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 La0.80Ti0.20OBiS2. This paper reveals a new high-pressure phase of La1-xMxOBiS2 containing the tetravalent ions M=Ti, Th which does not favor superconductivity. In contrast, application of pressure to fluorinated LaO0.5F0.5BiS2 produces an abrupt tetragonal-monoclinic transition to a metallic phase with an enhanced Tc. Here, these results demonstrate that the response of the normal and superconducting properties of LaOBiS2-based compounds depends strongly on the atomic site where themore » electron donor ions are substituted.« less

Authors:
 [1];  [1];  [1];  [1]
  1. Univ. of California, San Diego, La Jolla, CA (United States)
Publication Date:
Research Org.:
Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF)
OSTI Identifier:
1579948
Alternate Identifier(s):
OSTI ID: 1413555
Grant/Contract Number:  
NA0002909; FG02-04ER46105; DMR 1206553
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 21; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; phase transitions by order; pressure effects; superconductivity; transport phenomena

Citation Formats

Fang, Y., Yazici, D., Jeon, I., and Maple, M. B. High-pressure effects on nonfluorinated BiS2-based superconductors La1–xMxOBiS2 ( M=Ti and Th). United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.214505.
Fang, Y., Yazici, D., Jeon, I., & Maple, M. B. High-pressure effects on nonfluorinated BiS2-based superconductors La1–xMxOBiS2 ( M=Ti and Th). United States. doi:10.1103/PhysRevB.96.214505.
Fang, Y., Yazici, D., Jeon, I., and Maple, M. B. Fri . "High-pressure effects on nonfluorinated BiS2-based superconductors La1–xMxOBiS2 ( M=Ti and Th)". United States. doi:10.1103/PhysRevB.96.214505. https://www.osti.gov/servlets/purl/1579948.
@article{osti_1579948,
title = {High-pressure effects on nonfluorinated BiS2-based superconductors La1–xMxOBiS2 ( M=Ti and Th)},
author = {Fang, Y. and Yazici, D. and Jeon, I. and Maple, M. B.},
abstractNote = {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 La0.80Ti0.20OBiS2 and La0.85Th0.15OBiS2 superconductors were performed between ~1.5 and 300 K and under pressure up to 2.4 GPa. For both compounds, the superconducting transition temperature Tc, 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 La0.80Ti0.20OBiS2. This paper reveals a new high-pressure phase of La1-xMxOBiS2 containing the tetravalent ions M=Ti, Th which does not favor superconductivity. In contrast, application of pressure to fluorinated LaO0.5F0.5BiS2 produces an abrupt tetragonal-monoclinic transition to a metallic phase with an enhanced Tc. 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.},
doi = {10.1103/PhysRevB.96.214505},
journal = {Physical Review B},
number = 21,
volume = 96,
place = {United States},
year = {2017},
month = {12}
}

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Works referenced in this record:

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    Works referencing / citing this record:

    Superconductivity and structural instability in layered BiS 2 -based LaO 1−x BiS 2
    journal, January 2019

    • Chen, Yongliang; Cui, Yajing; Pham, Anh
    • Journal of Materials Chemistry C, Vol. 7, Issue 3
    • DOI: 10.1039/c8tc05729j