Pressure-induced enhancement of the superconducting properties of single-crystalline FeTe0.5Se0.5

• Published in: Journal of physics. Condensed matter Vol. 24; no. 26; p. 265701
• Main Authors: Pietosa, J, Gawryluk, D J, Puzniak, R, Wisniewski, A, Fink-Finowicki, J, Kozlowski, M, Berkowski, M
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 04.07.2012; Institute of Physics
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Critical currents; Exact sciences and technology; Metals, alloys and compounds (a15, 001c15, laves phases, chevrel phases, borocarbides, etc.); Physics; Properties of type I and type II superconductors; Superconducting materials (excluding high-tc compounds); Superconductivity; Critical current density; Iron based superconductors; Pressure effects; Superconducting transitions; Superconductivity; Critical field; Penetration depth; Magnetic susceptibility; Coherence length; Monocrystals; Superconductors; Anisotropy; Iron Selenides tellurides; Carrier density
• ISSN: 0953-8984; 1361-648X
• DOI: 10.1088/0953-8984/24/26/265701

The pressure dependence, up to 11.3 kbar, of basic parameters of the superconducting state, such as the critical temperature (Tc), the lower and the upper critical fields, the coherence length, the penetration depth, and their anisotropy, was determined from magnetic measurements performed for two single-crystalline samples of FeTe0.5Se0.5. We have found pressure-induced enhancement of all of the superconducting state properties, which entails a growth of the density of superconducting carriers. However, we noticed a more pronounced increase in the superconducting carrier density under pressure than that in the critical temperature which may indicate an appearance of a mechanism limiting the increase of Tc with pressure. We have observed that the critical current density increases under pressure by at least one order of magnitude.