Destruction of chain-superconductivity in YBa_2Cu_4O_8 in a weak magnetic field

Details Destruction of chain-superconductivity in YBa_2Cu_4O_8 in a weak magnetic field Destruction of chain-superconductivity in YBa_2Cu_4O_8 in a weak magnetic field

2010-08-20

arxiv.org/abs/1008.3532v1

Phys. Rev. B 82, 140506(R) (2010)

Physics

Condensed Matter

Superconductivity

5 pages

Scientific paper

10.1103/PhysRevB.82.140506

We report measurements of the temperature dependent components of the magnetic penetration depth {\lambda}(T) in single crystal samples of YBa_2Cu_4O_8 using a radio frequency tunnel diode oscillator technique. We observe a downturn in {\lambda}(T) at low temperatures for currents flowing along the b and c axes but not along the a axis. The downturn in {\lambda}_b is suppressed by a small dc field of ~0.25 T. This and the zero field anisotropy of {\lambda}(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.

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