Effect of annealing on the magnetic and superconducting properties of single-crystalline UCoGe
N.T. Huy, Y.K. Huang, A. de Visser
TL;DR
This study investigates how annealing improves the quality and properties of single-crystalline UCoGe, revealing enhanced ferromagnetic and superconducting characteristics after heat treatment.
Contribution
It demonstrates that heat treatment significantly enhances the sample quality and clarifies the magnetic and superconducting properties of UCoGe.
Findings
Increased residual resistance ratio from ~5 to ~30 after annealing
Ferromagnetic transition at T_C = 2.8 K with a small ordered moment
Superconductivity observed below T_s = 0.65 K
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 T_C is 2.8 K. The ordered moment of 0.06 mu_B is directed along the orthorhombic c-axis. Superconductivity is found below a resistive transition temperature T_s = 0.65 K.
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