Nernst and magnetization experiments reveal the existence of a large region of the cuprate phase diagram above the Tc curve in which vorticity and weak diamagnetism exist without phase coherence. We discuss the implication that the transition at Tc is caused by the loss of long-range phase coherence caused by spontaneous vortex creation. Below Tc, these measurements provide an estimate of the depairing field Hc 2 which is found to be very large (40 - 100 T depending on doping). We discuss the high-field Nernst and magnetization results, binding energy, and the phase diagram of hole-doped cuprates. Some new magnetization results on the vortex liquid in very underdoped LSCO in the limit T → 0 are reported as well.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Nernst effect
- Torque magnetometry
- Upper critical field
- Vortex liquid