Anisotropic effect of field on the orthorhombic-to-tetragonal transition in the striped cuprate (La,Nd)_{2-x}Sr_xCuO_4

H. Eisaki; N. P. Ong (Princeton University); S. Uchida (University of Tokyo); T. Noda; Z. A. Xu

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Anisotropic effect of field on the orthorhombic-to-tetragonal transition in the striped cuprate (La,Nd)_{2-x}Sr_xCuO_4

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arxiv cond-mat/9910123 v1 pith:2WJH62EZ submitted 1999-10-07 cond-mat.supr-con

Z. A. Xu , N. P. Ong (Princeton University) , T. Noda , H. Eisaki , S. Uchida (University of Tokyo) This is my paper

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The Nd-doped cuprate La_{2-y-x}Nd_ySr_xCuO_4 displays a first-order phase transition at T_d (= 74 K for x=0.10, y = 0.60) to a low-temperature tetragonal (LTT) phase. A magnetic field H applied || the a-axis leads to an increase in T_d, whereas T_d is decreased when H || c. These effects show that magnetic ordering involving both Nd and Cu spins plays a key role in driving the LTO-LTT transition. Related anisotropic effects are observed in the uniform susceptibility and the in-plane magnetoresistance.

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