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Lecture Marcello Barbosa da Silva Neto


15 september 2005 FWN-Building 5118.-156, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. Marcello Barbosa da Silva Neto
Affiliation: Institute of Theoretical Physics, Universiteit Utrecht
Title: One-magnon Raman Spectrum of La(2)CuO(4): the origin of the field-induced mode
Date: Thu Sep 15, 2005
Start: 11.00
Location: FWN-Building 5118.-156
Host: T.T.M. Palstra
Telephone: +31 50 363 4419


In this talk I will describe the one-magnon Raman scattering in the layered antiferromagnetic compound La(2)CuO(4). As I am going to show, the Raman signal is composed by two one-magnon peaks: one in the B1g channel, corresponding to the Dzyaloshinskii-Moryia (DM) mode, and another in the B3g channel, corresponding to the XY mode. Furthermore, I will show that a peak corresponding to the XY mode can be induced in the planar (RR) geometry when a magnetic field is applied along the easy axis for the sublattice magnetization. The appearance of such field-induced mode (FIM) signals the existence of a new magnetic state above the Neel temperature TN, where the direction of the weak-ferromagnetic moment (WFM) lies within the CuO2 planes. To conclude I will compare the Raman spectrum in La(2)CuO(4) to the spectrum of a similar system, Sr(2)CuO(2)Cl(2), where no DM peak is observed.
Laatst gewijzigd:22 oktober 2012 14:31