%0 Journal Article %1 PhysRevLett.126.157201 %A Yanagisawa, T %A Matsumori, H %A Saito, H %A Hidaka, H %A Amitsuka, H %A Nakamura, S %A Awaji, S %A Gorbunov, D I %A Zherlitsyn, S %A Wosnitza, J %A Uhlířová, K %A Vališka, M %A Sechovský, V %D 2021 %I American Physical Society %J Phys. Rev. Lett. %K b %N 15 %P 157201 %R 10.1103/PhysRevLett.126.157201 %T Electric quadrupolar contributions in the magnetic phases of UNi$_4$B %U https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.126.157201 %V 126 %X We present acoustic signatures of the electric quadrupolar degrees of freedom in the honeycomb-layer compound UNi4B. The transverse ultrasonic mode C66 shows softening below 30 K both in the paramagnetic phase and antiferromagnetic phases down to ∼0.33 K. Furthermore, we traced magnetic field-temperature phase diagrams up to 30 T and observed a highly anisotropic elastic response within the honeycomb layer. These observations strongly suggest that Γ6(E2g) electric quadrupolar degrees of freedom in localized 5f2 (J = 4) states are playing an important role in the magnetic toroidal dipole order and magnetic-field-induced phases of UNi4B, and evidence some of the U ions remain in the paramagnetic state even if the system undergoes magnetic toroidal ordering.

@article{PhysRevLett.126.157201, abstract = {We present acoustic signatures of the electric quadrupolar degrees of freedom in the honeycomb-layer compound UNi4B. The transverse ultrasonic mode C66 shows softening below 30 K both in the paramagnetic phase and antiferromagnetic phases down to ∼0.33 K. Furthermore, we traced magnetic field-temperature phase diagrams up to 30 T and observed a highly anisotropic elastic response within the honeycomb layer. These observations strongly suggest that Γ6(E2g) electric quadrupolar degrees of freedom in localized 5f2 (J = 4) states are playing an important role in the magnetic toroidal dipole order and magnetic-field-induced phases of UNi4B, and evidence some of the U ions remain in the paramagnetic state even if the system undergoes magnetic toroidal ordering.}, added-at = {2023-03-14T15:45:21.000+0100}, author = {Yanagisawa, T and Matsumori, H and Saito, H and Hidaka, H and Amitsuka, H and Nakamura, S and Awaji, S and Gorbunov, D I and Zherlitsyn, S and Wosnitza, J and Uhlířová, K and Vališka, M and Sechovský, V}, biburl = {https://www.bibsonomy.org/bibtex/28965ced2e7f4d520c619e4914afbfb0c/ctqmat}, day = 12, description = {Electric quadrupolar contributions in the magnetic phases of UNi4B}, doi = {10.1103/PhysRevLett.126.157201}, interhash = {20576186fe68dc94b833d63d4999795b}, intrahash = {8965ced2e7f4d520c619e4914afbfb0c}, journal = {Phys. Rev. Lett.}, keywords = {b}, month = {04}, number = 15, numpages = {6}, pages = 157201, publisher = {American Physical Society}, timestamp = {2023-10-19T10:16:37.000+0200}, title = {Electric quadrupolar contributions in the magnetic phases of UNi$_{\mathbf{4}}$B}, url = {https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.126.157201}, volume = 126, year = 2021 }