Driving magnetic order in a manganite by ultrafast lattice excitation

作者：Foerst M^*; Tobey R I; Wall S; Bromberger H; Khanna V; Cavalieri A L; Chuang Y D; Lee W S; Moore R; Schlotter W F; Turner J J; Krupin O; Trigo M; Zheng H; Mitchell J F; Dhesi S S; Hill J P; Cavalleri A

来源：Physical Review B, 2011, 84(24): 241104.

DOI：10.1103/PhysRevB.84.241104

Femtosecond midinfrared pulses are used to directly excite the lattice of the single-layer manganite La(0.5)Sr(1.5)MnO(4). Magnetic and orbital orders, as measured by femtosecond resonant soft x-ray diffraction with an x-ray free-electron laser, are reduced within a few picoseconds. This effect is interpreted as a displacive exchange quench, a prompt shift in the equilibrium value of the magnetic-and orbital-order parameters after the lattice has been distorted. Control of magnetism through ultrafast lattice excitation may be of use for high-speed optomagnetism.

• 出版日期2011-12-2