Strong Magneto-Elastic Coupling in Mn${}_3$X (X = Ge, Sn)

Abstract

We measure the full elastic tensors of Mn${}_3$Ge and Mn${}_3$Sn as a function of temperature through their respective antiferromagnetic phase transitions. Large discontinuities in the bulk moduli at the Néel transitions indicate strong magnetoelastic coupling in both compounds. Strikingly, the discontinuities are nearly a factor of 10 larger in Mn${}_3$Ge than in Mn${}_3$Sn. We use the magnitudes of the discontinuities to calculate the pressure derivatives of the Néel temperature, which are 39 K/GPa 14.3 K/GPa for Mn${}_3$Ge and Mn${}_3$Sn, respectively. We measured in-plane shear modulus $c_{66}$, which couples strongly to the magnetic order, in magnetic fields up to 18 T and found quantitatively similar behavior in both compounds. Recent measurements have demonstrated strong piezomagnetism in Mn${}_3$Sn: our results suggest that Mn${}_3$Ge may be an even better candidate for this effect.

17 pages, 8 figures

References in corpus (3)

• Pressure tuning of the anomalous Hall effect in the chiral antiferromagnet Mn3Ge
• Magnon-polaron excitations in the noncollinear antiferromagnet Mn${}_3$Ge
• Effect of Pressure on Magnetism of UIrGe

Cited by in corpus (8)

• Theory of nematic charge orders in kagome metals
• Magnetostriction, piezomagnetism and domain nucleation in a kagome antiferromagnet
• Resonant Ultrasound Spectroscopy for Irregularly-Shaped Samples and its Application to Uranium Ditelluride
• Magnetic interactions in AB-stacked kagome lattices: magnetic structure, symmetry, and duality
• Anisotropic Piezomagnetism in Noncollinear Antiferromagnets
• Rapid Method for Computing the Mechanical Resonances of Irregular Objects
• Hydrostatic and chemical pressure driven crossover from commensurate to the incommensurate state of the Weyl semimetal Mn${}_{3+x}$Sn${}_{1-x}$
• Uniaxial stress tuning of the anomalous Hall effect in Mn3Ge