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

N. P. Ong; (Princeton University) T. Kakeshita; R. Liang; S. Uchida; (University of Tokyo) D. A. Bonn; W. N. Hardy (University of British Columbia); Yayu Wang; Z. A. Xu

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

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arxiv cond-mat/0205299 v1 pith:LMWFVZMX submitted 2002-05-14 cond-mat.supr-con cond-mat.str-el

Yayu Wang , N. P. Ong , Z. A. Xu , (Princeton University) T. Kakeshita , S. Uchida , (University of Tokyo) D. A. Bonn , R. Liang , W. N. Hardy (University of British Columbia) This is my paper · ORCID

classification cond-mat.supr-concond-mat.str-el

keywords fieldcriticalcupratesfieldshighnernstphasetemperature

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abstract

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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Preformed Cooper Pairs in a Triclinic Iron Pnictide Superconductor
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In a triclinic iron pnictide superconductor, a spin resonance precursor, Nernst signal, and NMR density-of-states reduction all point to preformed Cooper pairs persisting to T* = 45 K, above Tc = 30 K.

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