Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-08-22
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 3 figures, to appear in Proc. 11th Int. Conf. on Muon Spin Rotation, Relaxation and Resonance (muSR2008)
Scientific paper
10.1016/j.physb.2008.11.167
Muon spin relaxation experiments have been performed in the pyrochlore iridate Pr_2Ir_2O_7 for temperatures in the range 0.025-250 K. Kubo-Toyabe relaxation functions are observed up to > 200 K, indicating static magnetism over this temperature range. The T -> 0 static muon spin relaxation rate Delta(0) ~ 8 mus^-1 implies a weak quasistatic moment (~0.1 mu_B). The temperature dependence of Delta is highly non-mean-field-like, decreasing smoothly by orders of magnitude but remaining nonzero below ~150 K. The data rule out ordering of the full Pr^3+ CEF ground-state moment (3.0 mu_B) down to 0.025 K. The weak static magnetism is most likely due to hyperfine-enhanced ^141Pr nuclear magnetism. The dynamic relaxation rate lambda increases markedly below ~20 K, probably due to slowing down of spin fluctuations in the spin-liquid state. At low temperatures lambda is strong and temperature-independent, indicative of a high density of low-lying spin excitations as is common in frustrated antiferromagnets.
Bernal O. O.
Heffner Robert H.
Ishida Keiichi
Luke Graeme M.
Machida Yoshinori
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