Effect of Hydrostatic Pressure on Eu{sub 3−x}Sr{sub x}Bi{sub 2}S{sub 4−y}Se{sub y}F{sub 4} (x = 1 and 2 and y = 1.5 and 2) Superconductors

Journal Article · Thu Aug 15 00:00:00 EDT 2019 · Journal of Superconductivity and Novel Magnetism

DOI:https://doi.org/10.1007/S10948-018-4989-9· OSTI ID:22922944

Subbulakshmi, N. ^[1]; Kalai Selvan, G. ^[2]; Manikandan, K.; Kannan, M. ^[1]; Haque, Z.; Gupta, L. C.; Ganguli, A. K. ^[3]

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1. Bharathidasan University, Centre for High Pressure Research, School of Physics (India)
2. University of Alabama at Birmingham, Department of Physics (United States)
3. Indian Institute of Technology, Department of Chemistry (India)

We have investigated the effect of pressure on Se-doped Eu{sub 2}SrBi{sub 2}S{sub 4}F{sub 4} and EuSr{sub 2}Bi{sub 2}S{sub 4}F{sub 4} at S sites. We report the electrical resistivity measurements under hydrostatic pressure (P) ~ 3 GPa and ~ 2.5 GPa on Eu{sub 2}SrBi{sub 2}S{sub 4−y}Se{sub y}F{sub 4} [dT{sub c}/dP ~ 1.68 K/GPa (x = 2)] and EuSr{sub 2}Bi{sub 2}S{sub 4−x}Se{sub x}F{sub 4} [dT{sub c}/dP ~ 1.57 K/GPa (x = 1.5) and 1.74 K/GPa (x = 2)] respectively. Pressure-induced superconductivity has been observed in EuSr{sub 2}Bi{sub 2}S{sub 2.5}Se{sub 1.5}F{sub 4} with T{sub c} of 2.42 K at 0.12 GPa and the T{sub c} increases with further application of P up to 3 GPa (dT{sub c}/dP ~ 1.12 K/GPa) and maximum T{sub c} of ~ 8 K is observed for EuSr{sub 2}Bi{sub 2}S{sub 2}Se{sub 2}F{sub 4.} These results corroborate the behavior of this material under high pressure magnetization studies. Further, the metallic nature is observed for EuSr{sub 2}Bi{sub 2}S{sub 2.5}Se{sub 1.5}F{sub 4}, EuSr{sub 2}Bi{sub 2}S{sub 2}Se{sub 2}F{sub 4}, and Eu{sub 2}SrBi{sub 2}S{sub 2}Se{sub 2}F{sub 4} compositions and it is slightly suppressed with the application of pressure. Pressure effect on upper critical field H{sub c2}(0) is estimated from magnetic field–dependent ρ(T) measurements and it is found to be higher for all compositions than parent compound. The field-dependent thermal activation energy (μ{sub 0}/k{sub B}) is calculated from Arrhenius plot using ρ(T) and designates a robust flux pinning potential which might be co-existing with applied magnetic field and pressure.

• OSTI ID: 22922944
• Journal Information: Journal of Superconductivity and Novel Magnetism, Vol. 32, Issue 8; Other Information: Copyright (c) 2019 Springer Science+Business Media, LLC, part of Springer Nature; Country of input: International Atomic Energy Agency (IAEA); ISSN 1557-1939
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTIVATION ENERGY
ALLOY SYSTEMS
BISMUTH COMPOUNDS
CRITICAL FIELD
DOPED MATERIALS
EUROPIUM COMPOUNDS
FLUORINE COMPOUNDS
HYDROSTATICS
MAGNETIC FLUX
MAGNETIZATION
PRESSURE DEPENDENCE
SELENIUM COMPOUNDS
STRONTIUM COMPOUNDS
SULFUR COMPOUNDS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TRANSITION TEMPERATURE