Dimensional Evolution of Spin Correlations in the Magnetic Pyrochlore Yb2Ti2O7

Published

November 30, 2011

Author(s)

K. A. Ross, L. R. Yaraskavitch, M. Laver, Jason S. Gardner, J. A. Quilliam, S. Meng, J. B. Kycia, Deepak Singh, Th. Proffen, H. A. Dabkowska, B. D. Gaulin

Abstract

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=265mK. We report neutron scattering measurements of the tehrmal evolution of the 2D spin correlations in space and time. Short range three dimensional (3D) spin correlations develop below 400mK, accompanied by a suppression in teh quasi-elastic (QE) scattering below 0.2 meV. These show a slowly fluctuating ground state with spins correlated over short distances within a kagome-trangular-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 265mK, which we discuss in the context of recent mean filed theoretical analysis.

Citation

Physical Review B

Volume

84

Issue

17

Pub Type

Journals

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Keywords

pyrochlore, neutron diffraction

Citation

Ross, K. , Yaraskavitch, L. , Laver, M. , Gardner, J. , Quilliam, J. , Meng, S. , Kycia, J. , Singh, D. , Proffen, T. , Dabkowska, H. and Gaulin, B. (2011), Dimensional Evolution of Spin Correlations in the Magnetic Pyrochlore Yb₂Ti₂O₇, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=909371 (Accessed December 14, 2024)