First-Order Superconducting Transition near a Ferromagnetic Quantum Critical Point

Andrey V. Chubukov; Alexander M. Finkel’stein; Robert Haslinger; Dirk K. Morr

doi:10.1103/PhysRevLett.90.077002

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First-Order Superconducting Transition near a Ferromagnetic Quantum Critical Point

Andrey V. Chubukov, Alexander M. Finkel’stein, Robert Haslinger, Dirk K. Morr

DOI 10.1103/PhysRevLett.90.077002 · Physical Review Letters

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Abstract

We address the issue of how triplet superconductivity emerges in an electronic system near a ferromagnetic quantum critical point (FQCP). Previous studies found that the superconducting transition is of second order, and Tc is strongly reduced near the FQCP due to pair-breaking effects from thermal spin fluctuations. In contrast, we demonstrate that near the FQCP, the system avoids pair-breaking effects by undergoing a first order transition at a much larger Tc. A second order superconducting transition emerges only at some distance from the FQCP.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
UGe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
MnSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown