Antiferromagnetic order as the competing ground state in electron-doped Nd1.85Ce0.15CuO4

Nature
H J KangY Tokura

Abstract

Superconductivity in the high-transition-temperature (high-T(c)) copper oxides competes with other possible ground states. The physical explanation for superconductivity can be constrained by determining the nature of the closest competing ground state, and establishing if that state is universal among the high-T(c) materials. Antiferromagnetism has been theoretically predicted to be the competing ground state. A competing ground state is revealed when superconductivity is destroyed by the application of a magnetic field, and antiferromagnetism has been observed in hole-doped materials under the influence of modest fields. None of the previous experiments have revealed the quantum phase transition from the superconducting state to the antiferromagnetic state, because they failed to reach the upper critical field B(c2). Here we report the results of transport and neutron-scattering experiments on electron-doped Nd1.85Ce0.15CuO4 (refs 13, 14), where B(c2) can be reached. The applied field reveals a static, commensurate, anomalously conducting long-range ordered antiferromagnetic state, in which the induced moment scales approximately linearly with the field strength until it saturates at B(c2). This and previous experiments on th...Continue Reading

Citations

Jul 28, 2013·Scientific Reports·Yoshiharu KrockenbergerHideki Yamamoto
Sep 25, 2004·Solid State Nuclear Magnetic Resonance·G V M WilliamsSung-Ik Lee
Mar 15, 2011·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Khee-Kyun Voo
Nov 22, 2011·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Khee-Kyun Voo
Oct 13, 2007·Physical Review Letters·Elbert E M ChiaS-I Lee
Apr 20, 2004·Physical Review Letters·Han-Dong ChenShou-Cheng Zhang
May 23, 2006·Physical Review Letters·E M MotoyamaM Greven
Aug 7, 2007·Physical Review Letters·Pengcheng LiR L Greene
Apr 20, 2004·Physical Review Letters·David Sénéchal, A-M S Tremblay
Aug 25, 2004·Physical Review Letters·O N BakharevJ Zaanen
Nov 5, 2004·Physical Review Letters·R ProzorovR W Giannetta

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