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Inherent Relation between Nernst Signal and Nodal Quasiparticle Transport in Pseudogap Region of Underdoped High Temperature Superconductors

Hai-Hu Wen·Hong Gao·Hao Jin·Lei Shan·Fang Zhou·Jiwu Xiong·Wenxin Ti
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Abstract

In-plane Nernst signal and resistivity have been measured for three $La_{2-x}Sr_xCuO_4$ single crystals (x=0.09, 0.11 and 0.145) with the magnetic field parallel to c-axis. A quadratic temperature dependence of resistivity, i.e., $ρ=ρ_0+aT^2$ is observed below a certain temperature $T_R$. It is found that the upper boundary of the Nernst signal $T_n$ coincides with $T_R$, which points to an inherent relation between the anomalous Nernst signal and the nodal quasiparticle transport in the pseudogap region. Finally a phase diagram together with the pseudogap temperature $T^*$ is presented, which suggests a second energy scale in the pseudogap region.

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Hai-Hu Wen, Hong Gao, Hao Jin, Lei Shan, Fang Zhou, Jiwu Xiong, Wenxin Ti. 2004-10-03. Inherent Relation between Nernst Signal and Nodal Quasiparticle Transport in Pseudogap Region of Underdoped High Temperature Superconductors. https://arxiv.org/abs/cond-mat/0410013

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