Journal
PHYSICAL REVIEW B
Volume 61, Issue 18, Pages 12427-12432Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.61.12427
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We present an exhaustive analysis of transport measurements performed in twinned YBa2Cu3O7 single crystals which establishes that the vortex solid-liquid transition is first order when the magnetic field H is applied at an angle theta away from the direction of the twin planes. We show that the resistive transitions are hysteretic and the V-I curves are nonlinear, displaying a characteristic S shape at the melting line H-m(T), which scales as epsilon(theta)H-m(T,theta), where epsilon(theta) is the anisotropy factor. These features are gradually lost when the critical point H*(theta) is approached. Above H*(theta) the V-I characteristics show a linear response in the experimentally accessible V-l window, and the transition becomes reversible. Finally we show that the first order phase transition takes place between a highly correlated Vortex liquid in the field direction and a solid state of unknown symmetry. As a consequence, our data support the scenario for a ver-tex-line melting in twinned YBa2Cu3O7 crystals in contrast to a vortex sublimation as recently suggested for untwinned La2-xSrxCuO4, YBa2Cu3O7 and Bi2Sr2CaCu2O8 [T. Sasagawa et al., Phys. Rev. Lett. 80, 4297 (1998)].
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