Strictly In-Plane Vortex-like Excitations in Pseudogap Region of Underdoped La2-xSrxCuO4 Single Crystals
H. H. Wen, Z. Y. Liu, Z. A. Xu, Z. Y. Weng, F. Zhou, Z. X. Zhao
Abstract
Nernst effect has been measured for an underdoped and an optimally doped La2-xSrxCuO4 single crystal with the magnetic field applied along different directions. For both samples, when H \| c, a significant Nernst voltage appears above Tc and keeps measurable up to a high temperature (100 K) as reported by Xu et al.[ Nature 406, 486(2000) ]. However, when H \| a-b plane the Nernst signal drops below the noise level quickly above Tc 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 strong indication for strictly in-plane vortex-like excitations in pseudo-gap region.
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