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.
@article{arxiv.cond-mat/0308607,
title = {Spurious magnetism in high-Tc superconductor},
author = {P. K. Mang and S. Larochelle and M. Greven},
journal= {arXiv preprint arXiv:cond-mat/0308607},
year = {2007}
}
Comments
Published in Nature 426, 139 (2003). Comment on "Antiferromagnetic order as the competing ground state in electron-doped Nd1.85Ce0.15CuO4", H.J. Kang et al., Nature 423, 522 (2003)