Localized Magnetic Excitations in the Fully Frustrated Dimerized Magnet Ba2CoSi2O6Cl2

Nobuyuki Kurita, Daisuke Yamamoto, Takuya Kanesaka, Nobuo Furukawa, Seiko Ohira-Kawamura, Kenji Nakajima, and Hidekazu Tanaka
Phys. Rev. Lett. 123, 027206 – Published 11 July 2019
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Abstract

Magnetic excitations of the effective spin S=1/2 dimerized magnet Ba2CoSi2O6Cl2 have been probed directly via inelastic neutron scattering experiments at temperatures down to 4 K. We observed five types of excitation at 4.8, 5.8, 6.6, 11.4, and 14.0 meV, which are all dispersionless within the resolution limits. The scattering intensities of the three low-lying excitations were found to exhibit different Q dependencies. Detailed analysis has demonstrated that Ba2CoSi2O6Cl2 is a two-dimensional spin dimer system described only by a single dimer site, where the triplet excitations are localized owing to the almost perfect frustration of the interdimer exchange interactions and the undimerized spins, even in small concentration, make an essential contribution to the excitation spectrum.

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  • Received 23 August 2018
  • Revised 8 April 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.027206

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Nobuyuki Kurita1, Daisuke Yamamoto2, Takuya Kanesaka2, Nobuo Furukawa2, Seiko Ohira-Kawamura3, Kenji Nakajima3, and Hidekazu Tanaka1

  • 1Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan
  • 2Department of Physics and Mathematics, Aoyama-Gakuin University, Sagamihara, Kanagawa 252-5258, Japan
  • 3Materials and Life Science Division, J-PARC Center, Tokai, Ibaraki 319-1195, Japan

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Issue

Vol. 123, Iss. 2 — 12 July 2019

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