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Journal of Physics: Condensed Matter Volume 19 Number 45 Create an alert RSS this journal

A Poole et al 2007 J. Phys.: Condens. Matter 19 452201 doi:10.1088/0953-8984/19/45/452201

Magnetic ordering in the XY pyrochlore antiferromagnet Er2Ti2O7: a spherical neutron polarimetry study

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A Poole1,2, A S Wills1,2,4 and E Lelièvre-Berna3

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Abstract References Cited By

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Er2Ti2O7 has been proposed as a realization of the XY \langle 111\rangle pyrochlore antiferromagnet with dipolar interactions, where the spins of Er3+ lie perpendicular to the \langle 111\rangle local axes. Below a Néel temperature of TN = 1.173 K magnetic order with the propagation vector \vec {k}=(000) occurs. Previous powder neutron diffraction studies were not able to determine details of the magnetic ordering beyond its symmetry due to powder averaging. In an attempt to resolve the questions as regards the ordering in this model magnet we performed a spherical neutron polarimetry experiment using CRYOPAD. The analysis of these data and a proposed magnetic order are presented.


PACS

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

75.30.Et Exchange and superexchange interactions

75.25.+z Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)

75.50.Ee Antiferromagnetics

Subjects

Condensed matter: electrical, magnetic and optical

Dates

Issue 45 (14 November 2007)

Received 16 July 2007, in final form 28 August 2007

Published 11 October 2007



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