Evidence from mechanical measurements for flux-lattice melting in single-crystal YBa2Cu3O7 and Bi2.2Sr2Ca0.8Cu2O8

P. L. Gammel; L. F. Schneemeyer; J. V. Wasczak; D. J. Bishop

doi:10.1103/PhysRevLett.61.1666

Evidence from mechanical measurements for flux-lattice melting in single-crystal YBa2Cu3O7 and Bi2.2Sr2Ca0.8Cu2O8

P. L. Gammel, L. F. Schneemeyer, J. V. Wasczak, D. J. Bishop

Chemistry and Biochemistry

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Abstract

We have studied flux-lattice melting in single crystals of YBa2Cu3O7 and Bi2.2Sr2Ca0.8Cu2O8 using a high-Q mechanical oscillator. In YBa2Cu3O7 with an applied magnetic field Hc^, flux-lattice melting occurs at Hc2 as in a conventional three-dimensional superconductor. However, for Hc^ flux-lattice melting occurs 3.2 K below Hc2. We believe that this is evidence for a transition into a vortex-liquid state similar to that seen in two-dimensional superconducting films. For Bi2.2Sr2Ca0.8Cu2O8 the effect is even more pronounced; with a bulk superconducting transition of 75 K, the flux-lattice melting in this material occurs in both orientations near 30 K.

Original language	English
Pages (from-to)	1666-1669
Number of pages	4
Journal	Physical Review Letters
Volume	61
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevLett.61.1666
State	Published - 1988

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title = "Evidence from mechanical measurements for flux-lattice melting in single-crystal YBa2Cu3O7 and Bi2.2Sr2Ca0.8Cu2O8",

abstract = "We have studied flux-lattice melting in single crystals of YBa2Cu3O7 and Bi2.2Sr2Ca0.8Cu2O8 using a high-Q mechanical oscillator. In YBa2Cu3O7 with an applied magnetic field Hc\textasciicircum{}, flux-lattice melting occurs at Hc2 as in a conventional three-dimensional superconductor. However, for Hc\textasciicircum{} flux-lattice melting occurs 3.2 K below Hc2. We believe that this is evidence for a transition into a vortex-liquid state similar to that seen in two-dimensional superconducting films. For Bi2.2Sr2Ca0.8Cu2O8 the effect is even more pronounced; with a bulk superconducting transition of 75 K, the flux-lattice melting in this material occurs in both orientations near 30 K.",

author = "Gammel, \{P. L.\} and Schneemeyer, \{L. F.\} and Wasczak, \{J. V.\} and Bishop, \{D. J.\}",

year = "1988",

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T1 - Evidence from mechanical measurements for flux-lattice melting in single-crystal YBa2Cu3O7 and Bi2.2Sr2Ca0.8Cu2O8

AU - Gammel, P. L.

AU - Schneemeyer, L. F.

AU - Wasczak, J. V.

AU - Bishop, D. J.

PY - 1988

Y1 - 1988

N2 - We have studied flux-lattice melting in single crystals of YBa2Cu3O7 and Bi2.2Sr2Ca0.8Cu2O8 using a high-Q mechanical oscillator. In YBa2Cu3O7 with an applied magnetic field Hc^, flux-lattice melting occurs at Hc2 as in a conventional three-dimensional superconductor. However, for Hc^ flux-lattice melting occurs 3.2 K below Hc2. We believe that this is evidence for a transition into a vortex-liquid state similar to that seen in two-dimensional superconducting films. For Bi2.2Sr2Ca0.8Cu2O8 the effect is even more pronounced; with a bulk superconducting transition of 75 K, the flux-lattice melting in this material occurs in both orientations near 30 K.

AB - We have studied flux-lattice melting in single crystals of YBa2Cu3O7 and Bi2.2Sr2Ca0.8Cu2O8 using a high-Q mechanical oscillator. In YBa2Cu3O7 with an applied magnetic field Hc^, flux-lattice melting occurs at Hc2 as in a conventional three-dimensional superconductor. However, for Hc^ flux-lattice melting occurs 3.2 K below Hc2. We believe that this is evidence for a transition into a vortex-liquid state similar to that seen in two-dimensional superconducting films. For Bi2.2Sr2Ca0.8Cu2O8 the effect is even more pronounced; with a bulk superconducting transition of 75 K, the flux-lattice melting in this material occurs in both orientations near 30 K.

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Evidence from mechanical measurements for flux-lattice melting in single-crystal YBa2Cu3O7 and Bi2.2Sr2Ca0.8Cu2O8

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