High-pressure evolution of the magnetic order in LaMnO.sub.3./sub.

0572066 - FZÚ 2024 RIV US eng J - Článek v odborném periodiku
Kozlenko, D. P. - Lukin, E.V. - Kichanov, S.E. - Jirák, Zdeněk - Golosova, N.O. - Savenko, B. N.
High-pressure evolution of the magnetic order in LaMnO₃.
Physical Review B. Roč. 107, č. 14 (2023), č. článku 144426. ISSN 2469-9950. E-ISSN 2469-9969
Institucionální podpora: RVO:68378271
Klíčová slova: manganites * Jahn-Teller distortions * insulator-metal transition
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 3.7, rok: 2022
Způsob publikování: Omezený přístup
http://doi.org/10.1103/PhysRevB.107.144426

A relationship between evolution of the long-range magnetic order, crystal structure, and lattice distortions in LaMnO3 was studied by a combination of neutron diffraction and Raman spectroscopy at high pressures up to 39 and 50 GPa, respectively, covering the temperature range 5 to 290 K. The Raman spectra reveal a gradual structural phase transformation evolving in the pressure range of 4 to 17 GPa, caused by a modification of the Jahn-Teller (JT) lattice distortions from the static cooperative character to the local one. A presence of residual JT-distorted regions associated with the initial phase is detected up to 32 GPa, where the insulator-metal transition occurs. At higher pressure, the local JT distortions also vanish completely at further compression up to 50 GPa. In the neutron diffraction data, a strong suppression of the A-type antiferromagnetic (AFM) phase is observed over the pressure region of the phase transformation.
Trvalý link: https://hdl.handle.net/11104/0342904