Calorimetric evidence for the occurrence of a first-order transition in the mixed state of untwinned YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}

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Using high-resolution differential thermal analysis (DTA) the authors have demonstrated directly, for the first time in a thermal experiment, that the vortex lattice of untwinned YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} in the mixed state (for magnetic fields H parallel and perpendicular to the c axis of the crystal) undergoes a first-order phase transition. The phase-transition line H{sub m}(T) in the magnetic phase diagram coincides with the vortex-lattice melting line that had been deduced previously from resistivity and magnetization measurements. The value obtained for the latent heat, L {approx} 0.5 k{sub B}T per vortex per superconducting layer for H{parallel}c, is consistent with ... continued below

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5 p.

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Schilling, A.; Fisher, R. A.; Phillips, N. E.; Welp, U.; Kwok, W. K. & Crabtree, G. W. August 1997.

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Using high-resolution differential thermal analysis (DTA) the authors have demonstrated directly, for the first time in a thermal experiment, that the vortex lattice of untwinned YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} in the mixed state (for magnetic fields H parallel and perpendicular to the c axis of the crystal) undergoes a first-order phase transition. The phase-transition line H{sub m}(T) in the magnetic phase diagram coincides with the vortex-lattice melting line that had been deduced previously from resistivity and magnetization measurements. The value obtained for the latent heat, L {approx} 0.5 k{sub B}T per vortex per superconducting layer for H{parallel}c, is consistent with that inferred from magnetization data using the Clapeyron equation, thus proving thermodynamic consistency. The specific heat of the vortex fluid is larger than that of the vortex solid. This specific-heat difference, {Delta}C/T, and the latent heat L, are independent of both the speed and the direction (up or down in T or H) of the traversal of the phase boundary H{sub m}(T), proving that the transition does not have the characteristics of a glass-like melting transition.

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5 p.

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INIS; OSTI as DE97007001

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  • International conference on materials and mechanisms of superconductivity: high temperature superconductors, Beijing (China), 28 Feb - 4 Mar 1997

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  • Other: DE97007001
  • Report No.: ANL/MSD/CP--93058
  • Report No.: CONF-970235--9
  • Grant Number: AC03-76SF00098;W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 521647
  • Archival Resource Key: ark:/67531/metadc692963

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  • August 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • April 5, 2016, 4:55 p.m.

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Schilling, A.; Fisher, R. A.; Phillips, N. E.; Welp, U.; Kwok, W. K. & Crabtree, G. W. Calorimetric evidence for the occurrence of a first-order transition in the mixed state of untwinned YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}, article, August 1997; California. (digital.library.unt.edu/ark:/67531/metadc692963/: accessed August 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.