Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, USA.
Phys Rev Lett. 2009 Oct 9;103(15):157401. doi: 10.1103/PhysRevLett.103.157401. Epub 2009 Oct 8.
We investigated magnetoelastic coupling through the field-driven transition to the fully polarized magnetic state in quasi-two-dimensional [Cu(HF2)(pyz)2]BF4 by magnetoinfrared spectroscopy. This transition modifies out-of-plane ring distortion and bending vibrational modes of the pyrazine ligand. The extent of these distortions increases with the field, systematically tracking the low-temperature magnetization. These distortions weaken the antiferromagnetic spin exchange, a finding that provides important insight into magnetic transitions in other copper halides.
我们通过磁红外光谱研究了通过磁场驱动过渡到近乎二维的[Cu(HF2)(pyz)2]BF4 的完全极化磁态的磁弹耦合。这种转变改变了吡嗪配体的面外环变形和弯曲振动模式。这些变形的程度随磁场增加而增加，系统地跟踪低温磁化。这些变形削弱了反铁磁自旋交换，这一发现为其他铜卤化物中的磁转变提供了重要的见解。
