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Phys Rev Lett
; 84(16): 3706-9, 2000 Apr 17.
Article
in English
| MEDLINE
| ID: mdl-11019182
ABSTRACT
The critical points in untwinned YBa(2)Cu(3)O(7-delta) crystals with dilute columnar defects are investigated. We find a convergence of a first order vortex melting line with an irreversibility line associated with the onset of the Bose glass critical regime at the lower critical point. In addition, we find that columnar defects raise the upper critical point, implying that vortex line meandering is a basic feature controlling its position.
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