H B Cao et al 2009 J. Phys.: Condens. Matter 21 492202 doi:10.1088/0953-8984/21/49/492202
H B Cao1, A Gukasov1, I Mirebeau1 and P Bonville2,3
Show affiliationsThe local Yb3+ magnetic susceptibility tensor was recently measured in the frustrated pyrochlore compound Yb2Ti2O7 by means of in-field polarized neutron scattering in a single crystal. A very anisotropic effective exchange tensor was derived for the Yb3+ ion. Using this result, we reinterpret here the data for the powder susceptibility in Yb2Ti2O7. We show that, in the case of a well-isolated Kramers doublet with anisotropic g and exchange tensors, the inverse susceptibility for a powder sample does not strictly obey a Curie–Weiss law at low temperature. We discuss the consequences regarding the paramagnetic Curie temperature, usually taken as a measure of the exchange/dipolar interaction, and the exotic 'slow fluctuation' ground state of Yb2Ti2O7.
75.30.Et Exchange and superexchange interactions
75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
Issue 49 (9 December 2009)
Received 29 September 2009, in final form 5 November 2009
Published 19 November 2009
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