Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-01-04
New J. Phys. 9, 76 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
15 pages, 6 figures
Scientific paper
10.1088/1367-2630/9/3/076
The temperature dependence of eigenfrequencies and intensities of the IR active modes has been investigated for the antiferromagnetic chromium spinel compounds CdCr2O4, ZnCr2O4, ZnCr2S4, ZnCr2Se4, and HgCr2S4 by IR spectroscopy for temperatures from 5 K to 300 K. At the transition into the magnetically ordered phases, and driven by spin-phonon coupling, most compounds reveal significant splittings of the phonon modes. This is true for geometrically frustrated CdCr2O4, and ZnCr2O4, for bond frustrated ZnCr2S4 and for ZnCr2Se4, which also is bond frustrated, but dominated by ferromagnetic exchange. The pattern of splitting is different for the different compounds and crucially depends on the nature of frustration and of the resulting spin order. HgCr2S4, which is almost ferromagnetic, exhibits no splitting of the eigenfrequencies, but shows significant shifts due to ferromagnetic spin fluctuations.
Hemberger Joachim
Kant Ch.
Loidl Alois
Mayr Franz
Rudolf Torsten
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