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Magnetic phase diagram of antiferro-quadrupole ordering in HoB2C2

The magnetic phase diagram for antiferro-quadrupole (AFQ) ordering in tetragonal HoB2C2 has been investigated by measurements of elastic constants C11, C44 and C66 in fields along the basal x-y plane as well as the principal [001]-axis. The hybrid magnet (GAMA) in Tsukuba Magnetic Laboratory was employed for high field measurements up to 30 T. The AFQ phase is no longer observed above 26.3 T along the principal [001] axis in contrast to the relatively small critical field of 3.9 T in fields applied along the basal [110] axis. The quadrupolar intersite interaction of Oxy and/or O 2 is consistent with the anisotropy in the magnetic phase diagram of the AFQ phase in HoB2C2.