Coexisting Magnetic Order and Cooperative Paramagnetism in the Stuffed Pyrochlore Tb₂₊ₓTi₂₋₂ₓNbₓO₇
Ueland, B. G. · Gardner, J. S. · Williams, A. J. · Dahlberg, M. L. · Kim, J. G. · Qiu, Y. · Copley, J. R. D. · Schiffer, P. · Cava, R. J.
Original · EN
Neutron scattering and magnetization measurements have been performed on the stuffed pyrochlore system Tb2+xTi2-2xNbxO7. We find that despite the introduction of chemical disorder and increasingly antiferromagnetic interactions, a spin glass transition does not occur for T >= 1.5 K and cooperative paramagnetic behavior exists for all x. For x = 1, Tb3NbO7, an antiferromagnetically ordered state coexisting with cooperative paramagnetic behavior is seen without applying any external fields or pressure, a situation advantageous for studying this cooperative behavior.
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