High Magnetic Field Phase of the Pyrochlore Quantum Magnet Tb$_2$Ti$_2$O$_7$
ORAL
Abstract
By means of ac magnetic-susceptibility and vibrating-sample magnetization measurements in magnetic fields along [111], we find a new magnetic phase of Tb$_2$Ti$_2$O$_7$ between 15T and 16T and below 2.5K with the existing magnetic transition at 1~2T and below 0.6mK. This new magnetic transition implies that the long-range ordering, which has been discussed in other reports, exists between 1T and 15T at low temperatures. Above the critical field of this transition, Tb$_2$Ti$_2$O$_7$ tends to be fully-polarized up to 35T or form an unknown spin-configuration. A new temperature-field phase diagram is established below 4~K and in a field up to 35T.
*The experiments were performed at the NHMFL High B/T Facility and DC-Field Facility, which are supported by NSF Grant DMR 0654118 and by the State of Florida.
–