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Dimensional Evolution of Spin Correlations in the Magnetic Pyrochlore Yb2Ti2O7



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


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.
Physical Review B


pyrochlore, neutron diffraction


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 Yb<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub>, Physical Review B, [online], (Accessed April 24, 2024)
Created November 29, 2011, Updated October 12, 2021