Localized magnetic excitations in the fully frustrated dimerized magnet Ba$_2$CoSi$_2$O$_6$Cl$_2$

Nobuyuki Kurita; Daisuke Yamamoto; Takuya Kanesaka; Nobuo Furukawa; Seiko Ohira-Kawamura; Kenji Nakajima; Hidekazu Tanaka

doi:10.1103/PhysRevLett.123.027206

paper

Localized magnetic excitations in the fully frustrated dimerized magnet Ba $_{2}$ CoSi $_{2}$ O $_{6}$ Cl $_{2}$

arXiv:1809.00519 · doi:10.1103/PhysRevLett.123.027206

Abstract

Magnetic excitations of the effective spin $S$ =1/2 dimerized magnet Ba $_{2}$ CoSi $_{2}$ O $_{6}$ Cl $_{2}$ 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 $Q$ -dependences. Detailed analysis has demonstrated that Ba $_{2}$ CoSi $_{2}$ O $_{6}$ Cl $_{2}$ 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.

arXiv comment6 pages, 3 figures, accepted for publication in Phys. Rev. Lett

Localized magnetic excitations in the fully frustrated dimerized magnet Ba $_{2}$ CoSi $_{2}$ O $_{6}$ Cl $_{2}$

Abstract

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Localized magnetic excitations in the fully frustrated dimerized magnet Ba2​CoSi2​O6​Cl2​

Abstract

References in corpus (18)

Cited by in corpus (4)

Localized magnetic excitations in the fully frustrated dimerized magnet Ba $_{2}$ CoSi $_{2}$ O $_{6}$ Cl $_{2}$