Magnetostructural coupling and spin dynamics in the 'breathing' pyrochlore antiferromagnets LiInCr4O8 and LiGaCr4O8
The chromium spinels of general formula ACr2O4 exemplify the pyrochlore antiferromagnet with strong spin-lattice coupling. We have prepared the A-site ordered compounds LiInCr4O8 and LiGaCr4O8, which realize the so-called "breathing" pyrochlore lattice; a pyrochlore lattice where the Cr-Cr bond lengths alternate on adjacent tetrahedra. Both of these materials are found to order with an accompanying change in the cell parameters at TN~14 K, but at higher T exhibit rather different behavior. The magnetic susceptibility of the In compound may be described by isolated tetrahedra, while the Ga compound is well fitted by by classical Monte Carlo simulations. This difference may be traced back to the difference in the amount of alternation in bond lengths between small and large tetrahedra. We propose here an investigation of the nuclear/magnetic structure and dynamics of both at low T using the D2B diffractometer and the IN4 spectrometer. In particular, we are interested in the low temperature magnetic structures, changes in nuclear structure across TN, and the possible presence of a "resonant" mode from the tetrahedra. We thus ask 6 days of beamtime: 3 days on D2B and 3 days on IN4.
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NILSEN Goran; Thomas C. Hansen; HIROI Z.; MASUDA Takatsugu; MUTKA Hannu; OKAMOTO Yoshihiko and TASSEL Cedric. (2013). Magnetostructural coupling and spin dynamics in the 'breathing' pyrochlore antiferromagnets LiInCr4O8 and LiGaCr4O8. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2275
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