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Nernst and seebeck coefficients of the cuprate superconductor YBa2Cu3O6.67: A Study of fermi surface reconstruction

Cornell Affiliated Author(s)


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


The Seebeck and Nernst coefficients S and ν of the cuprate superconductor YBa2Cu3Oy (YBCO) were measured in a single crystal with doping p=0.12 in magnetic fields up to H=28T. Down to T=9 K, ν becomes independent of field by H 30T, showing that superconducting fluctuations have become negligible. In this field-induced normal state, S/T and ν/T are both large and negative in the T→0 limit, with the magnitude and sign of S/T consistent with the small electronlike Fermi surface pocket detected previously by quantum oscillations and the Hall effect. The change of sign in S(T) at T 50 K is remarkably similar to that observed in La2-xBaxCuO4, La2-x-yNdySrxCuO4, and La2-x-yEuySrxCuO4, 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. © 2010 The American Physical Society.

Date Published


Physical Review Letters








Group (Lab)

Brad Ramshaw Group

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