Strictly In-Plane Vortex-like Excitations in Pseudogap Region of Underdoped $La_{2-x}Sr_xCuO_4$ Single Crystals

Details Strictly In-Plane Vortex-like Excitations in Pseudogap Region of Underdoped $La_{2-x}Sr_xCuO_4$ Single Crystals Strictly In-Plane Vortex-like Excitations in Pseudogap Region of Underdoped $La_{2-x}Sr_xCuO_4$ Single Crystals

2003-01-21

arxiv.org/abs/cond-mat/0301367v2

Europhys. Letts. 63, 583-589(2003)

Physics

Condensed Matter

Superconductivity

5 Pages, 4 Figures, Revised Feb.4, 2003

Scientific paper

10.1209/epl/i2003-00569-0

Nernst effect has been measured for an underdoped and an optimally doped $La_{2-x}Sr_xCuO_4$ single crystal with the magnetic field applied along different directions. For both samples, when $H \|$ c, a significant Nernst voltage appears above $T_c$ 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 $T_c$ 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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