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- W2022221507 abstract "We present an exhaustive analysis of transport measurements performed in twinned ${mathrm{YBa}}_{2}{mathrm{Cu}}_{3}{mathrm{O}}_{7}$ single crystals which establishes that the vortex solid-liquid transition is first order when the magnetic field H is applied at an angle $ensuremath{theta}$ away from the direction of the twin planes. We show that the resistive transitions are hysteretic and the $Vensuremath{-}I$ curves are nonlinear, displaying a characteristic S shape at the melting line ${H}_{m}(T),$ which scales as $ensuremath{varepsilon}(ensuremath{theta}{)H}_{m}(T,ensuremath{theta}),$ where $ensuremath{varepsilon}(ensuremath{theta})$ is the anisotropy factor. These features are gradually lost when the critical point ${H}^{*}(ensuremath{theta})$ is approached. Above ${H}^{*}(ensuremath{theta})$ the $Vensuremath{-}I$ characteristics show a linear response in the experimentally accessible $Vensuremath{-}I$ 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 vortex-line melting in twinned ${mathrm{YBa}}_{2}{mathrm{Cu}}_{3}{mathrm{O}}_{7}$ crystals in contrast to a vortex sublimation as recently suggested for untwinned ${mathrm{La}}_{2ensuremath{-}x}{mathrm{Sr}}_{x}{mathrm{CuO}}_{4},{mathrm{YBa}}_{2}{mathrm{Cu}}_{3}{mathrm{O}}_{7}$ and ${mathrm{Bi}}_{2}{mathrm{Sr}}_{2}{mathrm{CaCu}}_{2}{mathrm{O}}_{8}$ [T. Sasagawa et al., Phys. Rev. Lett. $80,$ 4297 (1998)]." @default.
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- W2022221507 date "2000-05-01" @default.
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- W2022221507 title "First-order phase transition of the vortex lattice in twinned<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>O</mml:mi></mml:mrow…" @default.
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- W2022221507 doi "https://doi.org/10.1103/physrevb.61.12427" @default.
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