Abstract
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 wave function 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.
| Original language | English |
|---|---|
| Article number | 156701 |
| Journal | Physical Review Letters |
| Volume | 132 |
| Issue number | 15 |
| DOIs | |
| State | Published - Apr 12 2024 |
Funding
This research was primarily supported by the National Science Foundation through the Center for Dynamics and Control of Materials: an NSF MRSEC under Cooperative Agreement No. DMR-1720595 and DMR-2308817. J.\u2009B.\u2009G. was supported by the Welch Foundation (F-1066). J.\u2009G. thanks Ministerio de Ciencia e Innovaci\u00F3n (MICINN) for granting the contract PRE2018-083398. J.\u2009A.\u2009A. thanks the Spanish Ministry of Science and Innovation for granting the project No. PID2021-122477OB-I00. NSF\u2019s ChemMatCARS, Sector 15 at the Advanced Photon Source (APS), Argonne National Laboratory (ANL) is supported by the Divisions of Chemistry (CHE) and Materials Research (DMR), National Science Foundation, under Grant No. NSF/CHE-1834750. Use of APS, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science by ANL, was supported by the U.S. DOE under Contract No. DE-AC02-06CH11357. Neutron powder diffraction measurements used resources at the Spallation Neutron Source (NOMAD instrument), a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. MANA is funded by MEXT\u2019s WPI, Japan. Synchrotron radiation at SPring-8 (BL02B2) was used under Japan Synchrotron Radiation Research Institute approval (2023A2361, 2023B1676). All simulations were performed on the high-performance computational clusters of Texas Advanced Computing Center (TACC). J.\u2009S.\u2009Z. is grateful for the enlightening discussion with Allan MacDonald.