Critical dynamics of singlet and triplet excitations in strongly frustrated spin systems

Details Critical dynamics of singlet and triplet excitations in strongly frustrated spin systems Critical dynamics of singlet and triplet excitations in strongly frustrated spin systems

2001-11-02

arxiv.org/abs/cond-mat/0111025v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.66.054401

New data for the two-dimensional J1-J2 model shows that the critical points for singlet and triplet excitations near J2/J1=0.38 are very close together, or coincident. We propose that this is a more general result: in strongly frustrated spin systems the critical dynamics of singlet and triplet excitations are closely related. An effective field theory for such a critical point, or points, is developed, and its implications discussed. The analysis suggests the existance of gapless or almost gapless singlet excitations in the magnetically disordered phase.

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