Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2022

Идентификатор DOI: 10.1103/PhysRevResearch.4.013004

Аннотация: Orthorhombic PbMnBO4 is a rare example of an insulating ferromagnet in which the magnetic properties, in particular the strong magnetic anisotropy, are determined by the Mn3+ Jahn-Teller ion. Here, we report on the detailed investigation of magnetic excitations in the subterahertz and terahertz frequency ranges, as well as lattice excitations in the terahertz range. Using polarized azimuthally resolved Raman spectroscopy, four branches of magnetic excitations were observed and assigned to one acoustic and three optical one-magnon modes. The coupling between ferromagnetic ordering at T-c = 31 K and the Jahn-Teller distortions of [MnO6] octahedra due to the spin-phonon interaction was directly observed for some specific phonon modes involved in these distortions. A spin-wave Hamiltonian was developed that allowed us to determine a unique set of exchange and effective anisotropy parameters. The intensity ratio of the anti-Stokes to Stokes acoustic magnon peaks is found to be anomalous and directly indicates the involvement of the magneto-optical parameters in the magnetic Raman scattering process. Orthorhombic PbMnBO4 is a rare example of an insulating ferromagnet in which the magnetic properties, in particular the strong magnetic anisotropy, are determined by the Mn3+ Jahn-Teller ion. Here, we report on the detailed investigation of magnetic excitations in the subterahertz and terahertz frequency ranges, as well as lattice excitations in the terahertz range. Using polarized azimuthally resolved Raman spectroscopy, four branches of magnetic excitations were observed and assigned to one acoustic and three optical one-magnon modes. The coupling between ferromagnetic ordering at TC=31K and the Jahn-Teller distortions of [MnO6] octahedra due to the spin-phonon interaction was directly observed for some specific phonon modes involved in these distortions. A spin-wave Hamiltonian was developed that allowed us to determine a unique set of exchange and effective anisotropy parameters. The intensity ratio of the anti-Stokes to Stokes acoustic magnon peaks is found to be anomalous and directly indicates the involvement of the magneto-optical parameters in the magnetic Raman scattering process. ©American Physical Society

Журнал: PHYSICAL REVIEW RESEARCH

Выпуск журнала: Vol. 4, Is. 1

Номера страниц: 13004

Место издания: AMER PHYSICAL SOC

Издатель: 0

• Prosnikov M.A. (Radboud Univ Nijmegen, High Field Magnet Lab, EMFL, Toernooiveld 7, NL-6525 ED Nijmegen, Netherlands; Radboud Univ Nijmegen, Inst Mol & Mat, Heyendaalseweg 135, NL-6525 AJ Nijmegen, Netherlands; Ioffe Inst, St Petersburg 194021, Russia)
• Bal M.E. (Radboud Univ Nijmegen, High Field Magnet Lab, EMFL, Toernooiveld 7, NL-6525 ED Nijmegen, Netherlands; Radboud Univ Nijmegen, Inst Mol & Mat, Heyendaalseweg 135, NL-6525 AJ Nijmegen, Netherlands)
• Kolkov M.I (Russian Acad Sci, Siberian Branch, Fed Res Ctr KSC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Sch Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia)
• Pankrats A.I (Russian Acad Sci, Siberian Branch, Fed Res Ctr KSC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Sch Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia)
• Pisarev R.V (Ioffe Inst, St Petersburg 194021, Russia)
• Christianen P.C.M. (Radboud Univ Nijmegen, High Field Magnet Lab, EMFL, Toernooiveld 7, NL-6525 ED Nijmegen, Netherlands; Radboud Univ Nijmegen, Inst Mol & Mat, Heyendaalseweg 135, NL-6525 AJ Nijmegen, Netherlands)

• Web of Science Core Collection
• Scopus
• Ядро РИНЦ (eLIBRARY.RU)