Thermal expansion of the superconducting ferromagnet UCoGe

Details Thermal expansion of the superconducting ferromagnet UCoGe Thermal expansion of the superconducting ferromagnet UCoGe

2010-08-16

arxiv.org/abs/1008.2635v1

Phys. Rev. B 82, 052502 (2010)

Physics

Condensed Matter

Superconductivity

5 pages; 5 figures; accepted for publication in Phys. Rev. B

Scientific paper

We report measurements of the coefficient of linear thermal expansion, $\alpha (T)$, of the superconducting ferromagnet UCoGe. The data taken on a single-crystalline sample along the orthorhombic crystal axes reveal a pronounced anisotropy, with the largest length changes along the $b$ axis. The large values of the step sizes $\Delta \alpha$ at the magnetic and superconducting phase transitions provide solid evidence for bulk magnetism and superconductivity. Specific-heat measurements corroborate bulk superconductivity. Thermal-expansion measurements in magnetic fields $B \parallel a,b$ show $\Delta \alpha$ at $T_C$ grows rapidly, which indicates the character of the ferromagnetic transition becomes first-order-like.

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