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Nernst and Seebeck Coefficients of the Cuprate SuperconductorYBa$ 2$Cu$ 3$O$ {6.67}$: A Study of Fermi Surface Reconstruction by Chang, J.; Daou, R.; Proust, Cyril; LeBoeuf, David; Doiron-Leyraud, Nicolas; Laliberte, Francis; Pingault, B.; Ramshaw, B. J.; Liang, Ruixing; Bonn, D. A.; Hardy, W. N.; Takagi, H.; Antunes, A.; Sheikin, I.; Behnia, K.; Taillefer, Louis is a scholarly article available to read on EtoBox.

What is Nernst and Seebeck Coefficients of the Cuprate SuperconductorYBa$ 2$Cu$ 3$O$ {6.67}$: A Study of Fermi Surface Reconstruction about?

The Seebeck and Nernst coefficients $S$ and $\nu$ of the cuprate superconductor YBa$_2$Cu$_3$O$_y$ (YBCO) were measured in a single crystal with doping $p = 0.12$ in magnetic fields up to H = 28 T. Down to T=9 K, $\nu$ becomes independent of field by $H \simeq 30$ T, showing that superconducting fluctuations have become negligible. In this field-induced normal state, $S/T$ and $\nu/T$ are both large and negative in the $T \to 0$ limit, with the magnitude and sign of $S/T$ consistent with the small electron-like Fermi surface pocket detected previously by quantum oscillations and the Hall effect. The change of sign in $S(T)$ at $T \simeq 50$ K is remarkably similar to that observed in La$_{2-x}$Ba$_x$CuO$_4$, La$_{2-x-y}$Nd$_y$Sr$_x$CuO$_4$ and La$_{2-x-y}$Eu$_y$Sr$_x$CuO$_4$, where it is clearly associated with the onset of stripe order. We propose that a similar density-wave mechanism causes the Fermi surface reconstruction in YBCO.

Author

Chang, J.; Daou, R.; Proust, Cyril; LeBoeuf, David; Doiron-Leyraud, Nicolas; Laliberte, Francis; Pingault, B.; Ramshaw, B. J.; Liang, Ruixing; Bonn, D. A.; Hardy, W. N.; Takagi, H.; Antunes, A.; Sheikin, I.; Behnia, K.; Taillefer, Louis

Published

2009

Language

EN