Quadrupole Order in the Frustrated Pyrochlore Tb${}_{2+x}$Ti${}_{2-x}$O${}_{7+y}$

H. Takatsu, S. Onoda, S. Kittaka +10

A hidden order that emerges in the frustrated pyrochlore Tb${}_{2+x}$Ti${}_{2-x}$O${}_{7+y}$ with $T_{\text{c}}=0.53$ K is studied using specific heat, magnetization, and neutron scatter…