Effects of magnetic field and twin domains on magnetostructural phase mixture inMn3O4: Raman scattering studies of untwinned crystals
| Autor: | Alexander Thaler, S. L. Gleason, S. L. Cooper, Gregory MacDougall, Taylor Byrum |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Condensed matter physics Melting temperature Spinel Degenerate energy levels 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Magnetic field Condensed Matter::Materials Science symbols.namesake Ferrimagnetism Condensed Matter::Superconductivity Phase (matter) 0103 physical sciences engineering symbols 010306 general physics 0210 nano-technology Anisotropy Raman scattering |
| Zdroj: | Physical Review B. 93 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.93.184418 |
| Popis: | The ferrimagnetic spinel ${\mathrm{Mn}}_{3}{\mathrm{O}}_{4}$ exhibits large and anisotropic changes in electronic and structural properties in response to an applied magnetic field. These changes are thought to result from the field-dependent tuning---via strong spin-lattice coupling---between two nearly degenerate magnetostructural phases. Recent variable-magnetic-field studies of ${\mathrm{Mn}}_{3}{\mathrm{O}}_{4}$ have been performed on melt-grown crystals, which can exhibit twin domains due to a Jahn-Teller structural transition below the melting temperature. Because of the near degeneracy of the magnetostructural phases, however, strain associated with the twin domains likely affects the magnetic responses of ${\mathrm{Mn}}_{3}{\mathrm{O}}_{4}$. In this report, we present a variable-magnetic-field Raman scattering study of untwinned ${\mathrm{Mn}}_{3}{\mathrm{O}}_{4}$ crystals grown out of a flux below the Jahn-Teller structural transition. We measure distinct $\mathbf{q}=0$ magnetic and vibrational excitation spectra for each isolated magnetostructural phase of untwinned ${\mathrm{Mn}}_{3}{\mathrm{O}}_{4}$ crystals and determine the symmetries of the observed excitations. We determine how the magnetostructural phase mixture changes in response to magnetic fields applied in the magnetic easy plane. Last, by comparing results on flux- and melt-grown ${\mathrm{Mn}}_{3}{\mathrm{O}}_{4}$ crystals, we show that the intrinsic mixture of the two magnetostructural phases is indeed strongly influenced by the presence of twin domains. |
| Databáze: | OpenAIRE |
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