Abstract
We report measurements of the coefficient of linear thermal expansion, , 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 axis. The large values of the step sizes 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 show at grows rapidly, which indicates the character of the ferromagnetic transition becomes first orderlike.
- Received 1 June 2010
DOI:https://doi.org/10.1103/PhysRevB.82.052502
©2010 American Physical Society