Unusual Magnetic-Field-Induced Phase Transition in the Mixed State of Superconducting NbSe2

A. V. Sologubenko; I. L. Landau; H. R. Ott; A. Bilusic; A. Smontara; H. Berger

doi:10.1103/PhysRevLett.91.197005

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Unusual Magnetic-Field-Induced Phase Transition in the Mixed State of Superconducting NbSe2

A. V. Sologubenko, I. L. Landau, H. R. Ott, A. Bilusic, A. Smontara, H. Berger

DOI 10.1103/PhysRevLett.91.197005 · Physical Review Letters

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Abstract

The thermal conductivity κ in the basal plane of single-crystalline hexagonal NbSe2 has been measured as a function of magnetic field H, oriented both along and perpendicular to the c axis, at several temperatures below Tc. With the magnetic field in the basal plane and oriented parallel to the heat flux we observed, in fields well below Hc2, an unexpected hysteretic behavior of κ(H) with all the generic features of a first order phase transition. The transition is not manifest in the κ(H) curves, if H is still in the basal plane but oriented perpendicularly to the heat-flux direction. The origin of the transition is not yet understood.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.2	Pressure not reported	unknown
NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.2	Pressure not reported	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown