Dimensional evolution of spin correlations in the magnetic pyrochlore Yb2Ti2O7

Publication: Research - peer-reviewJournal article – Annual report year: 2011

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The pyrochlore material Yb2Ti2O7 displays unexpected quasi-two-dimensional (2D) magnetic correlations within a cubic lattice environment at low temperatures, before entering an exotic disordered ground state below T=265 mK. We report neutron scattering measurements of the thermal evolution of the 2D spin correlations in space and time. Short-range three-dimensional (3D) spin correlations develop below 400 mK, accompanied by a suppression in the quasielastic (QE) scattering below ∼0.2 meV. These show a slowly fluctuating ground state with spins correlated over short distances within a kagome-triangular-kagome (KTK) stack along [111], which evolves to isolated kagome spin stars at higher temperatures. Furthermore, low-temperature specific heat results indicate a sample dependence to the putative transition temperature that is bounded by 265 mK, which we discuss in the context of recent mean field theoretical analysis. ©2011 American Physical Society
Original languageEnglish
JournalPhysical Review B (Condensed Matter and Materials Physics)
Volume84
Issue number17
Pages (from-to)174442
ISSN1098-0121
DOIs
StatePublished - 2011
Peer-reviewedYes

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Copyright 2011 American Physical Society. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Physical Society

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