Speaker
Description
Investigating the phase transitions of magnetic materials offers valuable insights into their fundamental physical mechanisms, thereby broadening the scope of their potential applications. While neutron scattering techniques are commonly employed by researchers for such studies, resonant elastic scattering using synchrotron radiation also proves highly effective in this field. The double-perovskite YBaCuFeO5 exhibits two magnetic phase transitions at TN1 ~ 455 K and TN2 ~ 175 K, respectively. Below TN2, the magnetic structure transforms from commensurate into a spiral magnetic structure with a propagation vector of (h/2 k/2 l/2+δ), incommensurability δ depending on temperature. Using elastic neutron scattering and resonant elastic x-ray scattering, this spiral structure was observed to consist of two spiral spin orderings originating from Fe3+ and Cu2+, respectively, i.e., forming a double-spiral spin ordering. In addition, under an applied magnetic field, neutron scattering measurements reveal more intricate magnetic structures, accompanied by pronounced thermal and magnetic hysteresis effects. We have successfully constructed the H-T phase diagram by employing high-quality single-crystal samples, offering deeper insights into the material’s magnetic behavior.
| Field of Condensed Matter | Magnetism |
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