Abstract
DC magnetic susceptibility (formula presented) and muon-spin-relaxation measurements (formula presented) on the geometrically frustrated systems (formula presented) and (formula presented) indicate a transition from a paramagnetic state to a quasistatic spin state at 12.5 K and 7.8 K, respectively. Comparison of low-temperature field strength measured by (formula presented) to that predicted by a dipole model suggests that only about 15% of the spin is static on the muon time scale. We observe slow spin fluctuations persisting to millikelvin temperatures, indicating that extremely low-energy magnetic excitations are present in these materials to the lowest temperatures. Our results demonstrate that substantial magnetic frustration remains, in spite of the tetragonal distortion occurring at (formula presented).
Original language | English |
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Pages (from-to) | 1-6 |
Number of pages | 6 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 66 |
Issue number | 17 |
DOIs | |
State | Published - 2002 |
Externally published | Yes |