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Anisotropic exchange in frustrated pyrochlore Yb2Ti2O7

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H B Cao1, A Gukasov1, I Mirebeau1 and P Bonville2,3

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The 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.


PACS

75.30.Gw Magnetic anisotropy

75.30.Et Exchange and superexchange interactions

75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)

75.30.Cr Saturation moments and magnetic susceptibilities

Subjects

Condensed matter: electrical, magnetic and optical

Dates

Issue 49 (9 December 2009)

Received 29 September 2009, in final form 5 November 2009

Published 19 November 2009



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