Abstract
The magnetic properties of tetragonal spinel, its metastable high-pressure modification , and of an modification with a high amount of lattice defects were investigated by direct current (dc) and alternating current (ac) magnetometry as well as by heat capacity measurements. An phase modification with a high amount of lattice defects instead of the desired metastable high pressure phase might unintentionally be obtained after the high-pressure application. The obtained results clarify strongly contradictory reports about the dc susceptibility data of in the literature. Further, in situ low-temperature x-ray diffraction experiments from 150 to 275 K and Mn K-edge x-ray absorption spectroscopy experiments at 80 and 300 K do not indicate any structural transition to be coupled with the magnetic transition at 210 K for the given sample. This is in contradiction with what was concluded from powder neutron diffraction alone in the literature, where a coupled structural transition accompanied with large atomic displacements of a Mn species was claimed to be accompanied to the magnetic transition.
- Received 6 February 2023
- Revised 15 March 2023
- Accepted 22 June 2023
DOI:https://doi.org/10.1103/PhysRevB.108.014417
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Published by the American Physical Society