A close look at antiferromagnetism in multidimensional phase diagram of electron-doped copper oxide

Heshan Yu; Ge He; Ziquan Lin; Jie Yuan; Beiyi Zhu; Yi-feng Yang; Tao Xiang; Feo. V. Kusmartsev; Liang Li; Junfeng Wang; Kui Jin

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arXiv · 1510.07388

A close look at antiferromagnetism in multidimensional phase diagram of electron-doped copper oxide

Heshan Yu·Ge He·Ziquan Lin·Jie Yuan·Beiyi Zhu·Yi-feng Yang·Tao Xiang·Feo. V. Kusmartsev·Liang Li·Junfeng Wang·Kui Jin

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Abstract

Emergency of superconductivity at the instabilities of antiferromagnetism (AFM), spin/charge density waves has been widely recognized in unconventional superconductors. In copper-oxide superconductors, spin fluctuations play a predominant role in electron pairing with electron dopants yet composite orders veil the nature of superconductivity for hole-doped family. However, in electron-doped ones the ending point of AFM is still in controversy for different probes or its sensitivity to oxygen content. Here, by carefully tuning the oxygen content, a systematic study of Hall signal and magnetoresistivity up to 58 Tesla on optimally doped La2-xCexCuO4+-{\delta} (x = 0.10) thin films identifies two characteristic temperatures at 62.5+-7.5 K and 25+-5 K. The former is quite robust whereas the latter becomes flexible with increasing magnetic field, thereby linked to two- and three-dimensional AFM, evident from the multidimensional phase diagram as a function of oxygen as well as Ce dopants. Consequently, the observation of extended AFM phase in contrast to {\mu}SR probe corroborates an elevated critical doping in field, providing an unambiguous picture to understand the interactions between AFM and superconductivity.

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Heshan Yu, Ge He, Ziquan Lin, Jie Yuan, Beiyi Zhu, Yi-feng Yang, Tao Xiang, Feo. V. Kusmartsev, Liang Li, Junfeng Wang, Kui Jin. 2015-10-26. A close look at antiferromagnetism in multidimensional phase diagram of electron-doped copper oxide. https://arxiv.org/abs/1510.07388

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