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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Optical Studies on the Phase Transitions in YBaMn2O6 Single Crystals
Rea Divina Mero1, Kirari Ogawa2, Shigeki Yamada2
1Department of Physics, National Taiwan Normal University, Taipei 11677, Taiwan.
ACS Omega
|September 9, 2021
Summary
This study reveals how optical properties and Raman spectroscopy track complex phase transitions in YBaMn2O6. Lattice, charge, and spin interactions are crucial for understanding Yttrium Barium Manganese Oxide behavior.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- YBaMn2O6 is a double perovskite material known for complex structural, magnetic, and charge/orbital ordering phase transitions.
- Understanding the interplay of these transitions is key to its potential applications.
Purpose of the Study:
- To investigate the correlation between temperature-dependent optical response and phase transitions in YBaMn2O6 single crystals.
- To elucidate the roles of lattice, charge, and spin interactions in this material.
Main Methods:
- Spectroscopic ellipsometry was used to analyze optical absorption spectra.
- Raman scattering spectroscopy was employed to study phonon modes and their temperature dependence.
Main Results:
- Optical absorption spectrum showed three bands (1.50, 4.05, 5.49 eV) attributed to d-d and charge-transfer transitions.
- Raman spectroscopy revealed temperature-dependent changes in phonon modes, including increased intensity of MnO6 octahedral modes below 200 K, new peaks associated with charge ordering, and magnetic order-induced changes in breathing modes.
- The Jahn-Teller mode showed hardening below 200 K, indicating spin-phonon coupling.
Conclusions:
- Lattice-charge-spin interactions significantly influence the phase transitions in YBaMn2O6.
- Spectroscopic methods effectively probe the complex interplay of electronic and structural properties in this material.
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