Signatures of Weak Spin-Phonon Coupling in 12R-BaTi0.4Mn0.6O3: A Raman Study

TL;DR

This study investigates weak spin-phonon coupling in 12R-BaTi0.4Mn0.6O3 using Raman spectroscopy, revealing deviations in phonon behaviour at low temperatures and estimating coupling strength, relevant for spintronic applications.

Contribution

It provides the first detailed analysis of spin-phonon coupling in 12R-BaTi0.4Mn0.6O3 through temperature-dependent Raman spectroscopy and magnetic measurements.

Findings

Weak antiferromagnetic interactions observed

Deviations in Raman-active phonons at low temperatures

Estimated spin-phonon coupling strength around 1.1-1.2 cm-1

Abstract

Antiferromagnetic materials with strong spin-phonon coupling have the potential for spintronic applications. Here, we report the structural, magnetic, and vibrational properties of 12R-BaTi0.4Mn0.6O3. Temperature-dependent magnetization data show the presence of weak antiferromagnetic interactions. Correlation between magnetic and vibrational properties are probed by using temperature-dependent Raman spectroscopic measurements. Two of the Raman active phonons show deviation from anharmonic behaviour at low temperatures which can be attributed to spin-phonon coupling. The strength of coupling is estimated using mean-field approximation and is found to be 1.1 and 1.2 cm-1 for phonons at 530 and 717 cm-1, respectively.