Destruction of chain superconductivity in YBa2Cu4O8 in a weak magnetic field

A. Serafin; J. D. Fletcher; S. Adachi; N. E. Hussey; A. Carrington

doi:10.1103/PhysRevB.82.140506

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Destruction of chain superconductivity in YBa2Cu4O8 in a weak magnetic field

A. Serafin, J. D. Fletcher, S. Adachi, N. E. Hussey, A. Carrington

DOI 10.1103/PhysRevB.82.140506 · Physical Review B

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Abstract

We report measurements of the temperature-dependent components of the magnetic penetration depth λ(T) in single-crystal samples of YBa2Cu4O8 using a radio-frequency tunnel diode oscillator technique. We observe a downturn in λ(T) at low temperatures for currents flowing along the b and c axes but not along the a axis. The downturn in λb is suppressed by a small dc field of ∼0.25 T. This and the zero field anisotropy of λ(T) likely result from proximity induced superconducting on the CuO chains. However we also discuss the possibility that a significant part of the anisotropy might originate from the CuO2 planes.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	80	Pressure unresolved	unknown
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
PrBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown