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Distinct field-induced ferroquadrupolar states for two different magnetic-field directions in DyNiAl

Ishii, I.; Suzuki, D.; Umeno, T.; Kurata, Y.; Wada, Y.; Suzuki, T.; Andreev, A. V.; Gorbunov, D.; Miyata, A.; Zherlitsyn, S.; Wosnitza, J.

The hexagonal Dy-based compound DyNiAl undergoes ferromagnetic and antiferromagnetic-type magnetic phase transitions at TC = 30 K and T1 = 15 K, respectively. To investigate the 4f -electronic state and quadrupole interactions in DyNiAl, we carried out ultrasonic measurements versus temperature and applied magnetic field. The transverse elastic moduli C44 and C66 show a prominent elastic softening originating from an interlevel ferroquadrupolar-type interaction between the ground state and excited Kramers doublets, clarified by a crystal field analysis. In magnetic fields applied along the [100] and [001] axes, we observed a field-induced phase transition. Because the quadrupole interaction is enhanced in high magnetic fields according to our calculations, we suggest a magnetic-field-induced ferroquadrupolar ordering of the electric quadrupoles Oxy and Oyz for fields applied along [100] and [001], respectively, with different quadrupolar order parameters depending on the field direction.

Permalink: https://www.hzdr.de/publications/Publ-32692
Publ.-Id: 32692