Negative Hopping Magnetoresistance and Dimensional Crossover in Lightly Doped Cuprate Superconductors

Details Negative Hopping Magnetoresistance and Dimensional Crossover in Lightly Doped Cuprate Superconductors Negative Hopping Magnetoresistance and Dimensional Crossover in Lightly Doped Cuprate Superconductors

2006-10-29

arxiv.org/abs/cond-mat/0610818v5

Physical Review B 76, 224512 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 3 figures; published version

Scientific paper

10.1103/PhysRevB.76.224512

We show that, due to the weak ferromagnetism of La$_{2-x}$Sr$_x$CuO$_4$, an external magnetic field leads to a dimensional crossover 2D $\to$ 3D for the in-plane transport. The crossover results in an increase of the hole's localization length and hence in a dramatic negative magnetoresistance in the variable range hopping regime. This mechanism quantitatively explains puzzling experimental data on the negative magnetoresistance in the N\'eel phase of La$_{2-x}$Sr$_x$CuO$_4$.

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