Competition between the modification of intrinsic superconducting properties and the pinning landscape under external pressure in CaKFe4As4 single crystals
Abstract
Measurements of low field magnetization, trapped flux magnetization and 5 K flux creep in single crystal of CaKFe4As4 under pressure up to 7.5 GPa in a diamond pressure cell are presented. The observed evolution of the temperature dependence of the self-field critical current and slowing down of the base temperature flux creep rate are explained within the two sources of pinning hypothesis involving presence of CaKFe4As4 intergrowths suggested in the literature. Above the half collapsed tetragonal structural transition under pressure, where superconductivity is non-bulk or absent, critically diminished or no diamagnetism and flux trapped magnetization were observed.
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