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Gapless magnetic excitations in the kagome antiferromagnet Ca-kapellasite probed by Cl-35 NMR spectroscopy

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Title: Gapless magnetic excitations in the kagome antiferromagnet Ca-kapellasite probed by Cl-35 NMR spectroscopy
Authors: Ihara, Y. Browse this author →KAKEN DB
Sasaki, T. Browse this author
Noguchi, N. Browse this author
Ishii, Y. Browse this author
Oda, M. Browse this author
Yoshida, H. Browse this author
Issue Date: 14-Nov-2017
Publisher: American Physical Society (APS)
Journal Title: Physical Review B
Volume: 96
Issue: 18
Start Page: 180409
Publisher DOI: 10.1103/PhysRevB.96.180409
Abstract: The low-energy magnetic excitations of the spin-1/2 kagome antiferromagnet CaCu3(OH)(6)Cl-2 center dot 0.6H(2)O (Ca-kapellasite) have been investigated by a Cl-35 NMR experiment in fields up to 18.9 T. Recently, Ca-kapellasite was found to be one of the most promising candidates to explore the intrinsic magnetic properties in kagome antiferromagnets, because magnetic defects, which deteriorate the intrinsic magnetic properties, are minimized by choosing Ca ions with a large ionic radius as the counterions. From our nuclear spin-lattice relaxation rate 1/T-1 measurement, we found a power-law temperature dependence below the magnetic ordering temperature T-M = 7.2 K, which leads us to suggest that gapless magnetic excitations survive even in the ordered state. This power-law behavior is suppressed in high magnetic fields. We discuss a possible magnetic state that can generate gapless excitations at low fields.
Rights: ©2017 American Physical Society
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 井原 慶彦

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