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20 April 2024

» arxiv » cond-mat/9912194

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High-Field Quasiparticle Tunneling in Bi_2Sr_2CaCu_2O_8+delta: Negative Magnetoresistance in the Superconducting State
N. Morozov ; L. Krusin-Elbaum ; T. Shibauchi ; L.N. Bulaevskii ; M.P. Maley ; Yu.I. Latyshev ; T. Yamashita ;
Date:	11 Dec 1999
Subject:	Superconductivity \| cond-mat.supr-con
Abstract:	We report on the c-axis resistivity rho_c(H) in Bi_2Sr_2CaCu_2O_{8+delta} that peaks in quasi-static magnetic fields up to 60 T. By suppressing the Josephson part of the two-channel (Cooper pair/quasiparticle) conductivity sigma_c (H), we find that the negative slope of ho_c(H) above the peak is due to quasiparticle tunneling conductivity sigma_q(H) across the CuO_2 layers below H_{c2}. At high fields (a) sigma_q(H) grows linearly with H, and (b) ho_c(T) tends to saturate (sigma_c eq 0) as T->0, consistent with the scattering at the nodes of the d-gap. A superlinear sigma_q(H) marks the normal state above T_c.
Source:	arXiv, cond-mat/9912194
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