NMR observation of ferro-quadrupole order in PrTi2Al20

Takanori Taniguchi, Makoto Yoshida, Hikaru Takeda, Masashi Takigawa, Masaki Tsujimoto, Akito Sakai, Yosuke Matsumoto, Satoru Nakatsuji

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21 Citations (Scopus)


We report the results of 27Al-NMR measurements on a single crystal of PrTi2Al20. This compound shows a phase transition near 2 K associated with the quadrupole degree of freedom of Pr ions, for which the ground state of the crystalline electric field is a nonmagnetic doublet. When a magnetic field is applied along the '111' direction, the NMR lines split upon entering the low-temperature phase, indicating the breaking of the three fold rotation symmetry due to the field-induced magnetic dipole perpendicular to the field. This provides microscopic evidence for a ferro order of the O20 quadrupole. Although a first-order transition is expected theoretically, the line splitting evolves continuously within the experimental resolution.

Original languageEnglish
Article number113703
JournalJournal of the Physical Society of Japan
Issue number11
Publication statusPublished - 2016 Nov 15


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