Giant Anisotropy of Magnetoresistance and "Spin Valve" effect in Antiferromagnetic $N{d}_{2-x}C{e}_{x}Cu{O}_4$

Abstract

We have studied anisotropic magnetoresistance (MR) and magnetization with rotating magnetic field (B) within $Cu{O}_2$ plane in lightly doped AF $N{d}_{2-x}C{e}_{x}Cu{O}_4$. \emph{A giant anisotropy} in MR is observed at low temperature below 5 K. The c-axis resistivity can be tuned about one order of magnitude just by changing B direction within $Cu{O}_2$ plane and a scaling behavior between out-of-plane and in-plane MR is found. A "Spin valve" effect is proposed to understand the giant anisotropy of out-of-plane MR and the evolution of scaling parameters with the external field. It is found that the field-induced spin-flop transition of Nd${}^{3+}$ layer under high magnetic field is the key to understand the giant anisotropy. These results suggest that a novel entanglement between charge and spin dominates the underlying physics.

arXiv comment7 pages, 8 figures

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