Vortex matter and strong pinning in underdoped PrFeAs(O,F) with atomic-sized defects

Andrey V. Sadakov; Vladimir A. Vlasenko; A. Yu. Levakhova; I. V. Zhuvagin; E. M. Fomina; V. A. Prudkoglyad; A.Y. Tsvetkov; A. S. Usoltsev; N. D. Zhigadlo

doi:10.1103/d4t9-gk9z

Vortex matter and strong pinning in underdoped PrFeAs(O,F) with atomic-sized defects

Andrey V. Sadakov, Vladimir A. Vlasenko, A. Yu. Levakhova, I. V. Zhuvagin, E. M. Fomina, V. A. Prudkoglyad, A.Y. Tsvetkov, A. S. Usoltsev, N. D. Zhigadlo

DOI 10.1103/d4t9-gk9z · Physical Review Materials

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Abstract

We present a comprehensive investigation of the field-dependent critical current density and pinning force, combined with a detailed analysis of the nanostructural defect landscape in single crystal of underdoped PrFeAs(O,F) superconductor. Our study demonstrates that for both in-plane and out-of-plane magnetic field orientations, critical current density exhibits a strong pinning regime in intermediate fields across the entire temperature range. The dominant contribution to pinning originates from oxygen-to-fluorine substitutional defects, oxygen vacancies, which all act as point defects via a quasiparticle mean free path fluctuation mechanism. Scanning transmission electron microscope studies did not reveal any volume or surface defect types within the lattice.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
PrFeAs(O,F) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	25.1	Pressure not reported	zero_resistance
PrFeAs(O,F) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	25.1	Pressure not reported	onset