High-pressure magnetism of the double perovskite Sr2FeOsO6 studied by synchrotron Fe 57 Mössbauer spectroscopy
Adler P, Medvedev SA, Naumov PG, Mohitkar S, Rueffer R, Jansen M, Felser C (2019)
Publication Type: Journal article
Publication year: 2019
Journal
Book Volume: 99
Article Number: 134443
Journal Issue: 13
DOI: 10.1103/PhysRevB.99.134443
Abstract
The pressure dependence of the magnetism of the double perovskite Sr2FeOsO6 was investigated by temperature- and magnetic-field-dependent synchrotron Fe57 Mössbauer spectroscopy in the energy domain up to ∼50 GPa. Sr2FeOsO6 is known to feature antiferromagnetic ordering below TN∼140 K and a change in spin structure from AF1 to AF2 near 70 K at ambient pressure. Previous Os L2,3 x-ray magnetic circular dichroism (XMCD) spectra [Veiga, Phys. Rev. B 91, 235135 (2015)10.1103/PhysRevB.91.235135] indicated a pressure-driven change from the antiferromagnetic to the ferrimagnetic state. Raman spectra of Sr2FeOsO6 collected at room temperature and up to 34 GPa are in agreement with previous x-ray-diffraction studies which verified that the tetragonal ambient pressure crystal structure is retained at high pressure. The Mössbauer investigations show that the Fe ions remain in the +3 high-spin (t2g3eg2) state over the whole pressure range. The magnetic ordering is strongly stabilized by high pressure and for p>30 GPa the ordering temperature is increased to above room temperature. Broad magnetic hyperfine patterns as well as coexistence of magnetic and paramagnetic signals at high pressures indicate the formation of inhomogeneous magnetic states. The shapes of applied-field Mössbauer spectra at low temperature are similar at 2 and 33 GPa and do not allow resolution of distinct antiferromagnetic and ferrimagnetic components. Pressure-induced spin canting in a basically antiferromagnetic spin structure or magnetic phase separation involving a pressure-induced minority ferrimagnetic phase may be the origin for the ferromagnetic XMCD signal.
Involved external institutions
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
European Synchrotron Radiation Facility (ESRF)
France (FR)
Germany (DE)
European Synchrotron Radiation Facility (ESRF)
France (FR)
How to cite
APA:
Adler, P., Medvedev, S.A., Naumov, P.G., Mohitkar, S., Rueffer, R., Jansen, M., & Felser, C. (2019). High-pressure magnetism of the double perovskite Sr2FeOsO6 studied by synchrotron Fe 57 Mössbauer spectroscopy. Physical Review B, 99(13). https://doi.org/10.1103/PhysRevB.99.134443
MLA:
Adler, Peter, et al. "High-pressure magnetism of the double perovskite Sr2FeOsO6 studied by synchrotron Fe 57 Mössbauer spectroscopy." Physical Review B 99.13 (2019).
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