• 2015, T. U. Ito, W. Higemoto, A. Sakai, M. Tsujimoto, S. Nakatsuji, “Perturbation on Hyperfine-enhanced ${\displaystyle ^{141}}$Pr Nuclear Spin Dynamics Associated with Antiferroquadrupolar Order in PrV${\displaystyle _{2}}$Al${\displaystyle _{20}}$”, in arXiv[1]:
No explicit sign of time-reversal symmetry breaking was found below the multipolar order temperature ${\displaystyle T_{Q}\sim 0.6}$ K in a zero applied field as anticipated on the basis of the antiferroquadrupolar (AFQ) order picture proposed by Sakai and Nakatsuji [J.