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Phys Rev Lett. 2000 Jun 19;84(25):5852-5.

Experimental evidence for the vortex glass phase in untwinned, proton irradiated YBa2Cu3O7-delta.

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1
Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008 and and Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.

Abstract

We report on magnetoresistance measurements of the effects of 9 MeV proton irradiation on a clean, untwinned single crystal of YBa2Cu3O7-delta. For the first time, evidence for a vortex glass transition is detected in an untwinned single crystal of YBa2Cu3O7-delta with induced pointlike disorder, in which the first order vortex melting transition is completely suppressed after proton irradiation. Our results suggest that a sufficiently high pinning disorder is required in order for the vortex glass phase to be observed.

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