$^{93}$Nb NMR investigation of the multiferroic system Ba$_3$NbFe$_3$Si$_2$O$_{14}$
POSTER
Abstract
We present $^{93}$Nb nuclear magnetic resonance spectroscopy and relaxation data on the new multiferroic system Ba$_3$NbFe$_3$Si$_2$O$_{14}$. The spin-lattice relaxation rate $^{93}$1/T$_1$ and spin-spin relaxation rate $^{93}$1/T$_2$ show a peak at 26 K accompanied by broadening of the NMR lineshapes, characteristic of N\'{e}el ordering. Salient features of $^{93}$Nb NMR lineshapes in the ordered phase and temperature-dependent $^{93}$Nb Knight shifts will be discussed in relation to the possible bulking or tilting of the NbO$_6$ octahedra (caused by magneto-lattice coupling) around the transition.
*This work was supported in part by NSF DMR-0602859 and performed at the National High Magnetic Field Laboratory, which is supported by NSF Cooperative Agreement No. DMR-0084173, EIEG grant, by the State of Florida, and by the DOE.