Composite spin and quadrupole wave in the ordered phase of Tb${}_{2+x}$Ti${}_{2-x}$O${}_{7+y}$

H. Kadowaki, H. Takatsu, T. Taniguchi +2

The hidden ordered state of the frustrated pyrochlore oxide Tb${}_{2+x}$Ti${}_{2-x}$O${}_{7+y}$ is possibly one of the two electric multipolar, or quadrupolar, states of the effective ps…