2010/09/12 by A. Levchenko, M. R. Norman, A. A. Varlamov · 1 citation
Physics and Astronomy · #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.83.020506
published as Phys. Rev. B 83, 020506(R) (2011) · 4 pages, 2 figures
arxiv created 2010/09/12 · arxiv updated 2015/05/19
The observation of a large Nernst signal in cuprates above the superconducting transition temperature has attracted much attention. A potential explanation is that it originates from superconducting fluctuations. Although the Nernst signal is indeed consistent with gaussian fluctuations for overdoped cuprates, gaussian theory fails to describe the temperature dependence seen for underdoped cuprates. Here, we consider the vertex correction to gaussian theory resulting from the pseudogap. This yields a Nernst signal in good agreement with the data.