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TT: Fachverband Tiefe Temperaturen

TT 9: Correlated Magnetism – Low-Dimensional Systems

TT 9.12: Vortrag

Montag, 17. März 2025, 18:00–18:15, H33

Evidence of multiple phase transition in Sr₂BB’O₆ — •Aprajita Joshi, Shalini Badola, Akriti Singh, and Surajit Saha — Indian Institute of Science Education and Research Bhopal, India

The manifestation of phase transition is well mimicked by the lattice, thus by phonons, which requires its correlation with other degrees of freedom (spins, phonons etc.). Often, one can study the behavior of associated phonons with external perturbation to get more insight into the ground state of the material. Thus, any changes in the phase can be tracked with the external stimuli. Keeping this in mind, we explored the structural and magnetic attributes of Sr₂BB’O₆ with the help of Raman spectroscopy, using temperature as an external perturbation. The obtained phonon parameter shows the signature of a series of structural phase transitions. Magnetic measurements reveal that it also stabilizes in an antiferromagnetic ground state. An apparent deviation in Raman modes was seen around both the magnetic transitions, acting as a signature of spin-phonon coupling in the system. Additionally, temperature-dependent Raman gave insight into the local distortion in the lattice arising in the magnetically ordered state. This was also corroborated by temperature-dependent XRD measurements.

Keywords: Spin-phonon coupling; Antiferromagnetic; Structural transition; Raman; phonon