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

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 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 themore » electron donor ions are substituted.« less

Authors:

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

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

Publication Date:: Fri Dec 15 00:00:00 EST 2017

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.

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                    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.  https://doi.org/10.1103/PhysRevB.96.214505

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                    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.  https://doi.org/10.1103/PhysRevB.96.214505.  https://www.osti.gov/servlets/purl/1579948.

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@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         = {Fri Dec 15 00:00:00 EST 2017},

  month        = {Fri Dec 15 00:00:00 EST 2017}

}

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Works referencing / citing this record:

Tail-like regime and BCS-BEC crossover due to hybridization in a two-band superconductor
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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

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