Enhancement of superconductivity near the ferromagnetic quantum critical point in UCoGe

Details Enhancement of superconductivity near the ferromagnetic quantum critical point in UCoGe Enhancement of superconductivity near the ferromagnetic quantum critical point in UCoGe

2009-08-17

arxiv.org/abs/0908.2325v1

Phys. Rev. Lett. 103 (2009) 097003

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures; accepted for publication in PRL

Scientific paper

We report a high-pressure single crystal study of the superconducting ferromagnet UCoGe. Ac-susceptibility and resistivity measurements under pressures up to 2.2 GPa show ferromagnetism is smoothly depressed and vanishes at a critical pressure $p_c = 1.4$ GPa. Near the ferromagnetic critical point superconductivity is enhanced. Upper-critical field measurements under pressure show $B_{c2}(0)$ attains remarkably large values, which provides solid evidence for spin-triplet superconductivity over the whole pressure range. The obtained $p-T$ phase diagram reveals superconductivity is closely connected to a ferromagnetic quantum critical point hidden under the superconducting `dome'.

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