Generalized phenomenological model for the magnetic field penetration and magnetization hysteresis loops of a type-II superconductor

Wei Xie; Yu-Hao Liu; Hai-Hu Wen

doi:10.1103/PhysRevB.105.014505

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Generalized phenomenological model for the magnetic field penetration and magnetization hysteresis loops of a type-II superconductor

Wei Xie, Yu-Hao Liu, Hai-Hu Wen

DOI 10.1103/PhysRevB.105.014505 · Physical Review B

T1

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Abstract

A generalized phenomenological model for the mixed state of type-II superconductors with magnetic field parallel to the superconducting plate is proposed. This model considers the global magnetization including both the equilibrium magnetization from surface screening current and the nonequilibrium magnetization from bulk pinning in a self-consistent way. Our model can be used to simulate the magnetization hysteresis loops (MHLs) and flux penetrating process of different type-II superconductors, from low- to high-κ values. Here we take a Ba0.6K0.4Fe2As2 single crystal and pure Nb plate as testing examples. The model can fit the data quite well and several important parameters can be extracted from the fitting. Thus the model can be extended to a general case for studying the magnetization and flux penetration in other type-II superconductors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Ba0.6K0.4Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown