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Anisotropic effect of field on the orthorhombic-to-tetragonal transition in the striped cuprate (La,Nd)2-xSrxCuO4

Z. A. Xu, N. P. Ong, T. Noda, H. Eisaki, S. Uchida

cond-mat.supr-conarXiv:cond-mat/9910123

Abstract

The Nd-doped cuprate La2-y-xNdySrxCuO4 displays a first-order phase transition at Td (= 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 Td, whereas Td 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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