Abstract
Despite a well-ordered pyrochlore crystal structure and strong magnetic interactions between the or ions, no long-range magnetic order has been detected in the pyrochlore titanates and . To explore the actual magnetic phase formed by cooling these materials, we measure their magnetization dynamics using toroidal, boundary-free magnetization transport techniques. We find that the dynamical magnetic susceptibility of both compounds has the same distinctive phenomenology, which is indistinguishable in form from that of the dielectric permittivity of dipolar glass-forming liquids. Moreover, and both exhibit microscopic magnetic relaxation times that increase along the super-Arrhenius trajectories analogous to those observed in glass-forming dipolar liquids. Thus, upon cooling below about 2 K, and both appear to enter the same magnetic state exhibiting the characteristics of a glass-forming spin liquid.
- Received 3 January 2018
- Revised 13 September 2018
DOI:https://doi.org/10.1103/PhysRevB.98.214430
©2018 American Physical Society