Paramagnetic to Antiferromagnetic Phase Transition in Non-Fermi Liquid Perovskites Induced by Strong Electronic Correlation*

A fourfold symmetric in-plane anisotropic magnetoresistance (AMR) is consistently measured from CaIrO₃ perovskite thin films grown on SrTiO₃(001) substrate, whose bulk property is known to be a paramagnetic semimetal. We demonstrate that the origin of this AMR signal is a spin-flop of antiferromagnetic phase in the localization regime of this material, which is supported by magnetometry data. We further discuss the fourfold symmetric in-plane AMR to be a universal behaviour observable from other perovskite compounds having neighbouring properties with CaIrO₃ when those materials are grown into ultrathin films to reach the localization regime. This work provides an experimental linkage between AMR and the tuning of quantum critical phase transition by electron-electron correlations.

In collaboration with: C.J. Li, Z. Huang, R. Guo, H. Wang, W.N. Lin, H.J. Harsan Ma, S.W. Zeng, W.X. Zhou, K. Han, Ping Yang, T. Venkatesan, J.S. Chen, S. J. Pennycook