The high-field phase diagram of the cuprates derived from the Nernst effect

Details The high-field phase diagram of the cuprates derived from the Nernst effect The high-field phase diagram of the cuprates derived from the Nernst effect

2002-05-14

arxiv.org/abs/cond-mat/0205299v1

Phys. Rev. Lett. 88, 257003 (2002).

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.88.257003

Measurements of the Nernst signal in the vortex-liquid state of the cuprates to high fields (33 T) reveal that vorticity extends to very high fields even close to the zero-field critical temperature $T_{c0}$. In overdoped $\rm La_{2-x}Sr_xCuO_4$ (LSCO) we show that the upper critical field $H_{c2}(T)$ curve does not end at $T_{c0}$, but at a much higher temperature. These results imply that $T_{c0}$ corresponds to a loss in phase rigidity rather than a vanishing of the pairing amplitude. An intermediate field $H^*(T)\ll H_{c2}(T)$ is shown to be the field scale for the flux-flow resistivity.

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