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Frustration driven lattice distortion: an NMR investigation of Y(2)Mo(2)O(7)
1Department of Physics, Technion-Israel Institute of Technology, Haifa 32000, Israel.
Physical Review Letters
|November 3, 2001
Abstract:
We have investigated the (89)Y NMR spectrum and spin lattice relaxation, T(1), in the magnetically frustrated pyrochlore Y(2)Mo(2)O(7). We find that upon cooling the spectrum shifts, and broadens asymmetrically. A detailed examination of the low T spectrum reveals that it is constructed from multiple peaks, each shifted by a different amount. We argue that this spectrum is due to discrete lattice distortions and speculate that these distortions relieve the frustration and reduce the system's energy.