First-Order Transition in the Magnetic Vortex Matter in Superconducting MgB2 Tuned by Disorder

T. Klein; R. Marlaud; C. Marcenat; H. Cercellier; M. Konczykowski; C. J. van der Beek; V. Mosser; H. S. Lee; S. I. Lee

doi:10.1103/PhysRevLett.105.047001

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First-Order Transition in the Magnetic Vortex Matter in Superconducting MgB2 Tuned by Disorder

T. Klein, R. Marlaud, C. Marcenat, H. Cercellier, M. Konczykowski, C. J. van der Beek, V. Mosser, H. S. Lee, S. I. Lee

DOI 10.1103/PhysRevLett.105.047001 · Physical Review Letters

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Abstract

The field-driven transition from an ordered Bragg glass to a disordered vortex phase in single-crystalline MgB2 is tuned by an increasing density of point defects, introduced by electron irradiation. The discontinuity observed in magnetization attests to the first-order nature of the transition. The temperature and defect density dependences of the transition field point to vortex pinning mediated by fluctuations in the quasiparticle mean free path, and reveal the mechanism of the transition in the absence of complicating factors such as layeredness or thermal fluctuations.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	35.5	Pressure unresolved	onset
NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown