Angular Dependence of the c -axis Normal State Magnetoresistance in Single Crystal Tl 2 Ba 2 </…
1996; American Physical Society; Volume: 76; Issue: 1 Linguagem: Inglês
10.1103/physrevlett.76.122
ISSN1092-0145
AutoresN. E. Hussey, J. R. Cooper, J. M. Wheatley, I. R. Fisher, A. Carrington, A. P. Mackenzie, C. T. Lin, O. Milat,
Tópico(s)Rare-earth and actinide compounds
ResumoWe report measurements of the normal state magnetoresistance (MR) from 30 to 340 K in fields B up to 13 T for single crystals of overdoped ${\mathrm{Tl}}_{2}{\mathrm{Ba}}_{2}{\mathrm{CuO}}_{6}$ $({T}_{c}\ensuremath{\le}25\mathrm{K})$. For out-of-plane current flow, the transverse MR $\ensuremath{\Delta}{\ensuremath{\rho}}_{c}/{\ensuremath{\rho}}_{c}$ is large and positive. On rotating B within the a-b plane, $\ensuremath{\Delta}{\ensuremath{\rho}}_{c}/{\ensuremath{\rho}}_{c}$ exhibits a striking anisotropy with fourfold symmetry. The amplitude of this effect increases as ${B}^{4}$ and the maximum MR occurs for B along the [110] crystallographic directions, i.e., at 45\ifmmode^\circ\else\textdegree\fi{} to the Cu-O-Cu bonds. This the first direct evidence for anisotropy of the in-plane mean free path in the cuprates.
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