Thermal expansion of the superconducting ferromagnet UCoGe

Abstract

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.

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

References in corpus (7)

• Superconductivity on the border of weak itinerant ferromagnetism in UCoGe
• Extremely Large and Anisotropic Upper Critical Field and the Ferromagnetic Instability in UCoGe
• Unusual upper critical field of the ferromagnetic superconductor UCoGe
• Enhancement of superconductivity near the ferromagnetic quantum critical point in UCoGe
• Field Re-entrant Superconductivity Induced by the Enhancement of Effective Mass in URhGe
• On the theory of superconductivity in ferromagnetic superconductors with triplet pairing
• Paramagnetic limiting in ferromagnetic superconductors with triplet pairing

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• Enhancement of superconductivity by pressure-induced critical ferromagnetic fluctuations in UCoGe
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• Existence of Anisotropic Spin Fluctuations at Low Temperature in the Normal Phase of the Superconducting Ferromagnet UCoGe
• Magnetoelastic phenomena in antiferromagnetic uranium intermetallics: the $\mathrm{UA}{\mathrm{u}}_2\mathrm{S}{\mathrm{i}}_2$ case
• Angular variation of the magnetoresistance of the superconducting ferromagnet UCoGe
• Superconducting and ferromagnetic phase diagram of UCoGe probed by thermal expansion
• Localization of 5f-electrons and pressure effects on magnetism in U intermetallics in the light of spin-fluctuation theory