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Phys. Rev. Lett. 92, 227003 (2004) [4 pages]

Spin-Flop Transition and the Anisotropic Magnetoresistance of Pr1.3-xLa0.7CexCuO4: Unexpectedly Strong Spin-Charge Coupling in the Electron-Doped Cuprates

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A. N. Lavrov1, H. J. Kang2,3, Y. Kurita1,*, T. Suzuki1,*, Seiki Komiya1, J. W. Lynn4, S.-H. Lee4, Pengcheng Dai2,3,†, and Yoichi Ando1,‡
1Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, Japan
2Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA
3Condensed Matter Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, USA
4NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA

Received 20 October 2003; published 4 June 2004

We use transport and neutron-scattering measurements to show that a magnetic-field-induced transition from noncollinear to collinear spin arrangement in adjacent CuO2 planes of lightly electron-doped Pr1.3-xLa0.7CexCuO4 (x=0.01) crystals affects significantly both the in-plane and out-of-plane resistivity. In the high-field collinear state, the magnetoresistance (MR) does not saturate but exhibits an intriguing fourfold-symmetric angular dependence, oscillating from being positive at B‖[100] to being negative at B‖[110]. The observed MR of more than 30% at low temperatures induced by a modest modification of the spin structure indicates an unexpectedly strong spin-charge coupling in electron-doped cuprates.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.227003
DOI:
10.1103/PhysRevLett.92.227003
PACS:
74.25.Fy, 74.20.Mn, 74.72.Jt, 75.25.+z

*Also at Department of Physics, Tokyo University of Science, Shinjuku-ku, Tokyo 162-8601, Japan.

†Electronic address: daip@ornl.gov

‡Electronic address: ando@criepi.denken.or.jp

 
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