%0 Journal Article %1 2021 %A Ihara, Yoshihiko %A Matsui, Kazuki %A Kohama, Yoshimitsu %A Luther, Sven %A Opherden, Daryna %A Wosnitza, Jochen %A Kühne, Hannes %A Yoshida, Hiroyuki K %D 2021 %I Physical Society of Japan %J J. Phys. Soc. Jpn. %K b %N 2 %P 023703 %R 10.7566/jpsj.90.023703 %T Emergence of frustrated short-range order above long-range order in the S = $\dfrac12$ kagome antiferromagnet CaCu$_3$(OD)$_6$Cl$_2·$0.6D$_2$O %U https://journals.jps.jp/doi/pdf/10.7566/JPSJ.90.023703 %V 90 %X We report on the low-energy dynamics in the kagome antiferromagnet CaCu3(OD)6Cl2∙0.6D2O (Ca-kapellasite) as studied by use of 2D-NMR measurements. Previous 35Cl-NMR measurements revealed that the nuclear spin–lattice relaxation rate (1/T1) shows two peaks at temperatures, T* = 7.2 K and Ts ≃ 25 K. While the low-temperature peak at T* is ascribed to the critical fluctuations near the long-range magnetic ordering, the origin of the high-temperature peak has not been fully understood. From the 1/T1 measurements on the D sites at the OD groups (DOD), we find no peak at Ts, evidencing that the high-temperature peak is not related to the molecular dynamics of the OD groups. We discuss the possibility of a frustration-induced short-range ordered state below Ts before the long-range order is stabilized by the Dzyaloshinskii–Moriya interaction. We also observed static internal fields at the DOD site in the long-range ordered state below T*, and confirm the previously proposed negative-chirality q = 0 magnetic structure.

@article{2021, abstract = {We report on the low-energy dynamics in the kagome antiferromagnet CaCu3(OD)6Cl2∙0.6D2O (Ca-kapellasite) as studied by use of 2D-NMR measurements. Previous 35Cl-NMR measurements revealed that the nuclear spin–lattice relaxation rate (1/T1) shows two peaks at temperatures, T* = 7.2 K and Ts ≃ 25 K. While the low-temperature peak at T* is ascribed to the critical fluctuations near the long-range magnetic ordering, the origin of the high-temperature peak has not been fully understood. From the 1/T1 measurements on the D sites at the OD groups (DOD), we find no peak at Ts, evidencing that the high-temperature peak is not related to the molecular dynamics of the OD groups. We discuss the possibility of a frustration-induced short-range ordered state below Ts before the long-range order is stabilized by the Dzyaloshinskii–Moriya interaction. We also observed static internal fields at the DOD site in the long-range ordered state below T*, and confirm the previously proposed negative-chirality q = 0 magnetic structure.}, added-at = {2021-10-14T16:48:12.000+0200}, author = {Ihara, Yoshihiko and Matsui, Kazuki and Kohama, Yoshimitsu and Luther, Sven and Opherden, Daryna and Wosnitza, Jochen and Kühne, Hannes and Yoshida, Hiroyuki K}, biburl = {https://www.bibsonomy.org/bibtex/2ef0e0d27f3dcae5930d6e89ed8315233/ctqmat}, day = 21, description = {Emergence of Frustrated Short-Range Order above Long-Range Order in the S = 1/2 Kagome Antiferromagnet CaCu3(OD)6Cl2*0.6D2O}, doi = {10.7566/jpsj.90.023703}, interhash = {f0923883422e56df6817116296be5c97}, intrahash = {ef0e0d27f3dcae5930d6e89ed8315233}, journal = {J. Phys. Soc. Jpn.}, keywords = {b}, month = {01}, number = 2, pages = 023703, publisher = {Physical Society of Japan}, timestamp = {2024-07-03T12:12:26.000+0200}, title = {Emergence of frustrated short-range order above long-range order in the S = $\mathbf{\dfrac{1}{2}}$ kagome antiferromagnet CaCu$_{\mathbf{3}}$(OD)$_{\mathbf{6}}$Cl$_{\mathbf{2}}·$0.6D$_{\mathbf{2}}$O}, url = {https://journals.jps.jp/doi/pdf/10.7566/JPSJ.90.023703}, volume = 90, year = 2021 }