Observation of a first-order phase transition deep within the vortex-solid region of YBa2Cu3O7
M. Reibelt, S. Weyeneth, A. Erb, A. Schilling
TL;DR
This study provides thermodynamic evidence for a temperature-dependent first-order phase transition deep within the vortex-solid region of YBa2Cu3O7, suggesting a possible structural change in the vortex lattice.
Contribution
It reports the discovery of a first-order phase transition inside the vortex-solid phase of YBa2Cu3O7 using magneto-caloric and magnetization measurements.
Findings
Identification of a first-order phase transition line within the vortex-solid region.
Discontinuities in entropy proportional to magnetic flux density.
Evidence suggesting a structural transition of the vortex lattice.
Abstract
We have investigated the magnetic phase diagram of a fully oxygenated detwinned YBa2Cu3O7 single crystal by means of magneto-caloric and magnetization measurements, and found thermodynamic evidence for a temperature dependent first-order phase-transition line deep within the vortex-solid region. The associated discontinuities in the entropy are apparently proportional to the magnetic flux density, which may hint at a structural transition of the vortex lattice.
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