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Hysteresis and Anisotropic Magnetoresistance in Antiferromagnetic Nd_(2-x)Ce_xCuO₄

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arxiv cond-mat/0412605 v1 pith:5IZ7IHXQ submitted 2004-12-22 cond-mat.str-el cond-mat.supr-con

Hysteresis and Anisotropic Magnetoresistance in Antiferromagnetic $Nd_{2-x}Ce_xCuO_{4}$

X. H. Chen , C. H. Wang , G. Y. Wang , X. G. Luo , J. L. Luo , G. T. Liu , N. L. Wang This is my paper
classification cond-mat.str-el cond-mat.supr-con
keywords spinhysteresisantiferromangeticobservedreorientationsymmetrytemperaturestransition
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abstract

The out-of-plane resistivity ($\rho_c$) and magnetoresistivity (MR) are studied in antiferromangetic (AF) $Nd_{2-x}Ce_xCuO_{4}$ single crystals, which have three types of noncollinear antiferromangetic spin structures. The apparent signatures are observed in $\rho_c(T)$ measured at the zero-field and 14 T at the spin structure transitions, giving a definite evidence for the itinerant electrons directly coupled to the localized spins. One of striking feature is an anisotropy of the MR with a fourfold symmetry upon rotating the external field (B) within ab plane in the different phases, while twofold symmetry at spin reorientation transition temperatures. The intriguing thermal hysteresis in $\rho_c(T,B)$ and magnetic hysteresis in MR are observed at spin reorientation transition temperatures.

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