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Weak magnetic transitions in pyrochlore Bi2Ir2O7

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arxiv 1302.6905 v2 pith:2OK4S5LE submitted 2013-02-27 cond-mat.str-el

Weak magnetic transitions in pyrochlore Bi2Ir2O7

P. J. Baker , J. S. Moeller , F. L. Pratt , W. Hayes , S. J. Blundell , T. Lancaster , T. F. Qi , G. Cao This is my paper
classification cond-mat.str-el
keywords magneticlow-temperaturerelaxationbi2ir2o7increasesmuonpyrochlorerate
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Muon spin relaxation measurements on Bi2Ir2O7 show that it undergoes a bulk magnetic transition at 1.84(3) K. This is accompanied by increases in the muon spin relaxation rate and the amplitude of the non-relaxing part of the signal. The magnetic field experienced by muons is estimated to be 0.7 mT at low-temperature, around two orders of magnitude smaller than that in other pyrochlore iridates. These results suggest that the low-temperature state represents ordering of exceptionally small magnetic moments with persistent weak dynamics. The relaxation rate increases further below 0.23(4) K, coincident with a growth in the specific heat, suggesting the existence of a second low-temperature magnetic transition.

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