Abstract
Neutron scattering, muon spin relaxation, and dc susceptibility studies have been carried out on polycrystalline , a pyrochlore antiferromagnet in which the moments reside on a network of corner-sharing tetrahedra. Unlike other geometrically frustrated systems, remains paramagnetic down to , rather than ordering into a conventional Néel or spin-glass-like state, despite the fact that short-range antiferromagnetic correlations (AFC) develop at . At the first AFC wave vector, its low-lying, relatively flat magnetic excitation spectrum softens partially below 30 K.
- Received 18 November 1997
DOI:https://doi.org/10.1103/PhysRevLett.82.1012
©1999 American Physical Society