Europhys. Lett., 63 (4) , pp. 583-589 (2003)
Two-dimensional feature of the Nernst effect in normal state of underdoped 2-x x single crystalsH. H. Wen1, Z. Y. Liu1, Z. A. Xu2, Z. Y. Weng3, F. Zhou1 and Z. X. Zhao1
1 National Laboratory for Superconductivity, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences P.O. Box 603, Beijing 100080, PRC
2 Physics Department, Zhejiang University - Zhejiang, PRC
3 Center for Advanced Study, Tsinghua University - Beijing 100084, PRC
(Received 14 March 2003; accepted in final form 18 June 2003)
The Nernst effect has been measured for an underdoped and an optimally doped 2-x x single crystal with the magnetic field applied along different directions. For both samples, when , a significant Nernst voltage appears above and keeps measurable up to a high temperature (100 ). However, when -plane the Nernst signal along the c-axis drops below the noise level quickly above for the underdoped sample. Moreover, the in-plane Nernst data with field at different angles shows a nice scaling behavior with the c-axis component of the field. All these give a strong indication for a 2D feature of the Nernst signal in the normal state of underdoped cuprate superconductors.
74.40.+k - Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.).
74.25.Fy - Transport properties (electric and thermal conductivity, thermoelectric effects, etc.).
74.72.Dn - -based cuprates.
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