Very low-frequency excitations in frustrated two-dimensional $S=1/2$ Heisenberg antiferromagnets

Details Very low-frequency excitations in frustrated two-dimensional $S=1/2$ Heisenberg antiferromagnets Very low-frequency excitations in frustrated two-dimensional $S=1/2$ Heisenberg antiferromagnets

2001-10-19

arxiv.org/abs/cond-mat/0110398v1

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.88.047601

muSR and 7Li NMR relaxation measurements in frustrated two-dimensional S=1/2 Heisenberg antiferromagnets on a square lattice are presented. It is found that both in Li2VOSiO4 and Li2VOGeO4, spin dynamics at frequencies well below the Heisenberg exchange frequency are present. These dynamics are associated with the motions of walls separating coexisting collinear domains with a magnetic wave vector rotated by 90 degrees.

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