Spurious magnetism in high-Tc superconductor

Details Spurious magnetism in high-Tc superconductor Spurious magnetism in high-Tc superconductor

2003-08-28

arxiv.org/abs/cond-mat/0308607v2

Physics

Condensed Matter

Published in Nature 426, 139 (2003). Comment on "Antiferromagnetic order as the competing ground state in electron-doped Nd1.8

Scientific paper

One challenge in condensed-matter physics is to unravel the interplay between magnetism and superconductivity in copper oxides with a high critical temperature (Tc). Kang et al. claim to have revealed a quantum phase transition from the superconducting to an antiferromagnetic state in the electron-doped material Nd2-xCexCuO4 (NCCO) based on the observation of magnetic-field-induced neutron scattering intensity at (1/2,1/2,0), (1/2,0,0), and related reflections. Here we argue that the observed magnetic intensity is due to a secondary phase of (Nd,Ce)2O3. We therefore contend that the effect is spurious and not intrinsic to superconducting NCCO.

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