Weakening of the diamagnetic shielding in FeSe1−xSx at high pressures

Weakening of the diamagnetic shielding in FeSe1−xSx at high pressures The superconducting transition of FeSe1−xSx with three distinct sulfur concentrations x was studied under hydrostatic pressures up to ∼70 kbar via bulk ac susceptibility. The pressure dependence of the superconducting transition temperature (Tc) features a small dome-shaped variation at low pressures for x=0.04 and x=0.12, followed by a more substantial Tc enhancement to a value of around 30 K at moderate pressures. In x=0.21, a similar overall pressure dependence of Tc is observed, except that the small dome at low pressures is flattened. For all three concentrations, a significant weakening of the diamagnetic shielding is observed beyond the pressure around which the maximum Tc of 30 K is reached near the verge of the pressure-induced magnetic phase. This observation points to a strong competition between the magnetic and high-Tc superconducting states at high pressure in this system. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Weakening of the diamagnetic shielding in FeSe1−xSx at high pressures

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Weakening of the diamagnetic shielding in FeSe1−xSx at high pressures

Abstract

The superconducting transition of FeSe1−xSx with three distinct sulfur concentrations x was studied under hydrostatic pressures up to ∼70 kbar via bulk ac susceptibility. The pressure dependence of the superconducting transition temperature (Tc) features a small dome-shaped variation at low pressures for x=0.04 and x=0.12, followed by a more substantial Tc enhancement to a value of around 30 K at moderate pressures. In x=0.21, a similar overall pressure dependence of Tc is observed, except that the small dome at low pressures is flattened. For all three concentrations, a significant weakening of the diamagnetic shielding is observed beyond the pressure around which the maximum Tc of 30 K is reached near the verge of the pressure-induced magnetic phase. This observation points to a strong competition between the magnetic and high-Tc superconducting states at high pressure in this system.
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Publisher
American Physical Society (APS)
Copyright
Copyright © ©2017 American Physical Society
ISSN
1098-0121
eISSN
1550-235X
D.O.I.
10.1103/PhysRevB.96.020502
Publisher site
See Article on Publisher Site

Abstract

The superconducting transition of FeSe1−xSx with three distinct sulfur concentrations x was studied under hydrostatic pressures up to ∼70 kbar via bulk ac susceptibility. The pressure dependence of the superconducting transition temperature (Tc) features a small dome-shaped variation at low pressures for x=0.04 and x=0.12, followed by a more substantial Tc enhancement to a value of around 30 K at moderate pressures. In x=0.21, a similar overall pressure dependence of Tc is observed, except that the small dome at low pressures is flattened. For all three concentrations, a significant weakening of the diamagnetic shielding is observed beyond the pressure around which the maximum Tc of 30 K is reached near the verge of the pressure-induced magnetic phase. This observation points to a strong competition between the magnetic and high-Tc superconducting states at high pressure in this system.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Jul 13, 2017

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