Effect of annealing on the magnetic and superconducting properties of single-crystalline UCoGe
Abstract
Single-crystals of the new ferromagnetic superconductor UCoGe have been grown. The quality of as-grown samples can be significantly improved by a heat-treatment procedure, which increases the residual resistance ratio (RRR) from ~5 to ~30. Magnetization and resistivity measurements show the annealed samples have a sharp ferromagnetic transition with a Curie temperature TC is 2.8 K. The ordered moment of 0.06 muB is directed along the orthorhombic c-axis. Superconductivity is found below a resistive transition temperature Ts = 0.65 K.
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