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Weak magnetic transitions in pyrochlore Bi2Ir2O7.

Baker, P.J. and Möller, J.S. and Pratt, F.L. and Hayes, W. and Blundell, S.J. and Lancaster, T. and Qi, T.F. and Cao, G. (2013) 'Weak magnetic transitions in pyrochlore Bi2Ir2O7.', Physical review B., 87 (18). p. 180409.


Muon spin relaxation measurements on Bi 2 Ir 2 O 7 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 nonrelaxing 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 static magnetism of exceptionally small magnetic moments, ∼ 0.01μ B /Ir. The relaxation rate increases further below 0.23(4) K, coincident with an upturn in the specific heat, suggesting the existence of a second low-temperature magnetic transition.

Item Type:Article
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Publisher statement:© 2013 American Physical Society
Date accepted:No date available
Date deposited:24 January 2014
Date of first online publication:May 2013
Date first made open access:No date available

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