J. Phys. IV France 7 (1997) C2-529-C2-530
Electronic Structure of Manganese in GMR Perovskites as Seen by the Soft X-Ray Absorption SpectroscopyF. Studer1, O. Toulemonde1, V. Caignaert1, P. Srivastava2, J.B. Goedkoop3 and N.B. Brookes3
1 CRISMAT, ISMRA, 14050 Caen cedex, France
2 CMPL, University of Rajasthan, Jaipur 302004, India
3 ESRF, BP. 220, 38043 Grenoble cedex 09, France
The changes in the electronic structure of manganese perovskites Ln1-xAxMnO3 (Ln = La, Pr ; A = Ca, Sr, Ba; 0 ≤ x ≤ 0.33) exhibiting GMR properties have been investigated above and below the transition temperature by soft X-ray Absorption Spectroscopy at Mn L2,3-edge. The analysis of the Mn L3-edges both in the paramagnetic-insulating state and in the metallic-ferromagnetic state have been performed by a linear combination of a Mn(IV) reference and two simulated spectra corresponding to High Spin and Low Spin Mn(III). The results of the simulation, although not perfect, indicate that, upon crossing the transition, a change occurs in the ratio HS/LS of Mn(III) states.
© EDP Sciences 1997