Observation of a first-order phase transition deep within the vortex-solid region of YBa2Cu3O7

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.

References in corpus (11)

• Fulde-Ferrell-Larkin-Ovchinnikov Superconducting State in CeCoIn5
• Calorimetric Evidence for a Fulde-Ferrell-Larkin-Ovchinnikov Superconducting State in the Layered Organic Superconductor κ$-(BEDT-TTF)$_2$Cu(NCS)$_2$
• Two-Dimensional Geometry of Spin Excitations in the High Temperature Superconductor YBa2Cu3O6+x
• Real time magneto-optical imaging of vortices in superconductors
• Observation of a Triangular to Square Flux Lattice Phase Transition in YBCO
• Fermi surface and order parameter driven vortex lattice structure transitions in twin-free YBa2Cu3O7
• Real-space vortex glass imaging and the vortex phase diagram of SnMo6S8
• Effect of fluctuations on vortex lattice structural transitions in superconductors
• Low-frequency flux noise and visualization of vortices in a YBa2Cu3O7 dc SQUID washer with an integrated input coil
• Low-temperature differential-thermal analysis to measure variations in entropy
• Anomalous Paramagnetic Effects in the Mixed State of LuNi2B2C