Charge and Spin Excitations in Double-Layer Manganites
D B. Romero, V B. Podobedov, A Weber, J.F. Mitchell, Y Moritomo, H D. Drew
Charge and spin dynamics in La2-2xSr1+2xMn2O7 (x=0.4,0.5) are probed by magneto-Raman spectroscopy. A competition between charge-order, antiferromagnetic superexchange and ferromagnetic double-exchange correlations characterize a regime of short-range order in the paramagnetic-insulating state. An electronic continuum in the ferromagnetic-metal state is suppressed at low frequencies, indicating unconventional dynamics associated with 2D strongly-interacting electrons.
Physical Review Letters
layered manganites, Raman spectroscopy, strongly-correlated systems
, Podobedov, V.
, Weber, A.
, Mitchell, J.
, Moritomo, Y.
and Drew, H.
Charge and Spin Excitations in Double-Layer Manganites, Physical Review Letters
(Accessed October 2, 2023)