论文标题
MN $ _3 $ x（x = ge，sn）中的强磁弹性耦合
Strong Magneto-Elastic Coupling in Mn$_3$X (X = Ge, Sn)
论文作者
论文摘要
我们通过各自的抗磁性相变的温度来测量MN $ _3 $ ge和Mn $ _3 $ sn的完整弹性张量。 Néel跃迁的大块模量中的大不连续性表明两种化合物中的磁弹性耦合很强。令人惊讶的是，在MN $ _3 $ GE中的不连续性几乎比Mn $ _3 $ SN大10倍。我们使用不连续性的大小来计算Néel温度的压力衍生物，分别为39 k/gpa 14.3 k/gpa，分别为MN $ _3 $ _3 $ GE和MN $ _3 $ SN。我们测量了平面内剪切模量$ c_ {66} $，该模量与磁性顺序强烈，在最高18吨的磁场中，并在两种化合物中都在定量相似的行为。最近的测量结果表明，MN $ _3 $ SN中的强烈压电：我们的结果表明，MN $ _3 $ GE可能是更好的候选这一效果。
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.
