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NEUTRON MEASUREMENTS OF THE VORTEX LATTICE IN YBA2CU3O7

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Abstract

Neutron diffraction has been used to measure the vortex lattice scattering for YBa2Cu3O7. A square pattern is found when the field is applied along the c axis, while a triangular pattern is found when the field is applied well away from the c axis. High-resolution measurements for the square pattern show that the vortex lattice has long-range orientational order but only short-range positional order. The temperature dependence of the penetration depth is not that expected for a superconductor with a conventional s-wave BCS-type gap. Preliminary measurements for temperatures near the irreversibility line are consistent with the occurrence of melting of the vortex lattice or glass phase

Topics: QC
Publisher: AMER INST PHYSICS
OAI identifier: oai:wrap.warwick.ac.uk:21313
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