Weak quasistatic magnetism in the frustrated Kondo lattice Pr 2Ir 2O 7 - Condensed Matter > Strongly Correlated ElectronsReport as inadecuate




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Abstract: Muon spin relaxation experiments have been performed in the pyrochloreiridate Pr 2Ir 2O 7 for temperatures in the range 0.025-250 K. Kubo-Toyaberelaxation functions are observed up to > 200 K, indicating static magnetismover this temperature range. The T -> 0 static muon spin relaxation rateDelta0 ~ 8 mus^-1 implies a weak quasistatic moment ~0.1 mu B. Thetemperature dependence of Delta is highly non-mean-field-like, decreasingsmoothly by orders of magnitude but remaining nonzero below ~150 K. The datarule out ordering of the full Pr^3+ CEF ground-state moment 3.0 mu B down to0.025 K. The weak static magnetism is most likely due to hyperfine-enhanced^141Pr nuclear magnetism. The dynamic relaxation rate lambda increases markedlybelow ~20 K, probably due to slowing down of spin fluctuations in thespin-liquid state. At low temperatures lambda is strong andtemperature-independent, indicative of a high density of low-lying spinexcitations as is common in frustrated antiferromagnets.



Author: D. E. MacLaughlin, Y. Ohta, Y. Machida, S. Nakatsuji, G. M. Luke, K. Ishida, R. H. Heffner, Lei Shu, O. O. Bernal

Source: https://arxiv.org/







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