Magnetization, Nernst effect and vorticity in the cuprates

Details Magnetization, Nernst effect and vorticity in the cuprates Magnetization, Nernst effect and vorticity in the cuprates

2006-11-28

arxiv.org/abs/cond-mat/0611731v1

J. Magn. Magn. Mater. 310, 460-466 (2007)

Physics

Condensed Matter

Superconductivity

Symposium talk, Int. Conf. Magnetism Kyoto 2006, 6.3 pages, 7 figures

Scientific paper

Nernst and magnetization experiments reveal the existence of a large region of the cuprate phase diagram above the $T_c$ curve in which vorticity and weak diamagnetism exist without phase coherence. We discuss the implication that the transition at $T_c$ is caused by the loss of long-range phase coherence caused by spontaneous vortex creation. Below $T_c$, these measurements provide an estimate of the depairing field $H_{c2}$ 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 $T\to 0$ are reported as well.

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