A new perovskite KOsO3 has been stabilized under high-pressure and high temperature conditions. It is cubic at 500 K (Pm-3m) and undergoes subsequent phase transitions to tetragonal at 320 K (P4/mmm) and rhombohedral (R-3m) at 230 K as shown from refining synchrotron X-ray powder diffraction (SXRD) data. The larger orbital overlap integral and the extended wavefunction of 5d electrons in the perovskite KOsO3 allow to explore physics from the regime where Mott and Hund's rule couplings dominate to the state where the multiple interactions are on equal footing. We demonstrate an exotic magnetic ordering phase found by neutron powder diffraction along with physical properties via a suite of measurements including magnetic and transport properties, differential scanning calorimetry, and specific heat, which provide comprehensive information for a system at the crossover from localized to itinerant electronic behavior.
@article{arxiv.2403.13239,
title = {Exotic magnetism in perovskite KOsO3},
author = {Jie Chen and Hongze Li and Javier Gainza and Angel Munoz and Jose A. Alonso and Jue Liu and Yu-Sheng Chen and Alexei A. Belik and Kazunari Yamaura and Jiaming He and Xinyu Li and John B. Goodenough and J. -S. Zhou},
journal= {arXiv preprint arXiv:2403.13239},
year = {2024}
}