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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


Romero, D. , Podobedov, V. , Weber, A. , Mitchell, J. , Moritomo, Y. and Drew, H. (2008), Charge and Spin Excitations in Double-Layer Manganites, Physical Review Letters (Accessed May 19, 2024)


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Created October 16, 2008