Thermal expansion of the superconducting ferromagnet UCoGe

A. Gasparini; Y. K. Huang; J. Hartbaum; H. v. Löhneysen; A. de Visser

doi:10.1103/PhysRevB.82.052502

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Thermal expansion of the superconducting ferromagnet UCoGe

A. Gasparini, Y. K. Huang, J. Hartbaum, H. v. Löhneysen, A. de Visser

DOI 10.1103/PhysRevB.82.052502 · Physical Review B

T1

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Abstract

We report measurements of the coefficient of linear thermal expansion, α(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 Δα 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∥a,b show Δα at TC grows rapidly, which indicates the character of the ferromagnetic transition becomes first orderlike.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
UCoGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.8	Pressure unresolved	unknown
UCoGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.6	Pressure unresolved	onset
UCoGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.45	Pressure unresolved	midpoint
UCoGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.5	Pressure unresolved	onset
UCoGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.35	Pressure unresolved	midpoint
UCoGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.5	Pressure unresolved	zero_resistance
UCoGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.42	Pressure unresolved	midpoint
UGe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
UIr Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
URhGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure unresolved	unknown