Superconducting magnetization above the irreversibility line in Tl2Ba2CuO6+δ

C. Bergemann; A. W. Tyler; A. P. Mackenzie; J. R. Cooper; S. R. Julian; D. E. Farrell

doi:10.1103/PhysRevB.57.14387

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Superconducting magnetization above the irreversibility line in Tl2Ba2CuO6+δ

C. Bergemann, A. W. Tyler, A. P. Mackenzie, J. R. Cooper, S. R. Julian, D. E. Farrell

DOI 10.1103/PhysRevB.57.14387 · Physical Review B

T1

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Abstract

Piezolever torque magnetometry has been used to measure the magnetization of superconducting Tl2Ba2CuO6+δ. Three crystals with different levels of oxygen overdoping were investigated in magnetic fields up to 10 T. In all cases, the magnetization above the irreversibility line was found to depart from the behavior M∼ln(ηHc2/H) of a simple London-like vortex liquid. In particular, for a strongly overdoped (Tc=15K) crystal, the remnant superconducting order above the irreversibility line is characterized by a linear diamagnetic response (M∼H) that persists well above Tc and also up to the highest field employed.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Tl2Ba2CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15	Pressure not reported	unknown
Tl2Ba2CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	25	Pressure not reported	unknown
Tl2Ba2CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	85	Pressure not reported	unknown