Elastic and magnetoelastic properties of TbMnO3 single crystal by nanosecond time resolved acoustics and first-principles calculations

TL;DR

This study combines nanosecond time-resolved acoustics and first-principles calculations to determine the elastic and magnetoelastic properties of TbMnO3 single crystals, revealing detailed elastic constants and insights into their magnetoelastic behavior.

Contribution

It provides a comprehensive experimental and theoretical analysis of the elastic and magnetoelastic properties of TbMnO3, including precise elastic constants and their relation to magnetic order.

Findings

Determined six diagonal elastic constants of TbMnO3.

Measured sound velocities along multiple high-symmetry directions.

Provided first-principles insights into magnetoelastic interactions.

Abstract

Time resolved pump and probe acoustics and first-principles calculations were employed to assess elastic properties of the TbMnO3 perovskite manganite having orthorhombic symmetry. Measuring sound velocities of bulk longitudinal and shear acoustic waves propagating along at least two different directions in the high symmetry planes (100), (010) and (001), provided a powerful mean to selectively determine the six diagonal elastic constants C11= 227 GPa, C22= 349 GPa, C33= 274 GPa, C44= 71 GPa, C55= 57 GPa, C66= 62 GPa. Among the three remaining off-diagonal ones, C23= 103 GPa was determined with a bissectrice direction. Density functional theory calculations with colinear spin-polarized provided complementary insights on their optical, elastic and magnetoelastic properties.