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.
Description
Electric quadrupolar contributions in the magnetic phases of UNi4B
%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
}