Raman Scattering from Higgs Mode Oscillations in the Two-Dimensional Antiferromagnet Ca2RuO4

• Authors: SOULIOU S.M.; CHALOUPKA Jiří; KHALIULLIN G.; RYU G.; JAIN A.; KIM B.J.; LE TACON M.; KEIMER B.
• Year of publication: 2017
• Type: Article in Periodical
• Magazine / Source: Physical Review Letters
• MU Faculty or unit: Faculty of Science
• Web: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.119.067201
• Doi: http://dx.doi.org/10.1103/PhysRevLett.119.067201
• Field: Solid matter physics and magnetism
• Keywords: ruthenates; Raman scattering; magnetic model; magnon; amplitude mode
• Description: We present and analyze Raman spectra of the Mott insulator Ca2RuO4, whose quasi-two-dimensional antiferromagnetic order has been described as a condensate of low-lying spin-orbit excitons with angular momentum J(eff) = 1. In the A(g) polarization geometry, the amplitude (Higgs) mode of the spin-orbit condensate is directly probed in the scalar channel, thus avoiding infrared-singular magnon contributions. In the B-1g geometry, we observe a single-magnon peak as well as two-magnon and two-Higgs excitations. Model calculations using exact diagonalization quantitatively agree with the observations. Together with recent neutron scattering data, our study provides strong evidence for excitonic magnetism in Ca2RuO4 and points out new perspectives for research on the Higgs mode in two dimensions.

Related projects

• Mikroskopické modely magnetismu supravodivých pniktidů železa a vrstevnatých oxidů iridia
• CEITEC 2020