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


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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