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Tuning of the charge ordered state in the manganite thin films by internal or external strains
Author(s) -
Antonakos A.,
Filippi M.,
Aydogdu G. H.,
Prellier W.,
Habermeier H.U.,
Liarokapis E.
Publication year - 2009
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200880545
Subject(s) - manganite , hydrostatic pressure , thin film , materials science , doping , charge ordering , substrate (aquarium) , condensed matter physics , raman spectroscopy , charge (physics) , nanotechnology , optoelectronics , optics , ferromagnetism , thermodynamics , physics , oceanography , geology , quantum mechanics
We have investigated methods for tuning the charge ordered state in the R 1– x Ca x MnO 3 (R = La, Pr) manganite thin films grown on different substrates (SrTiO 3 (STO), LaAlO 3 (LAO), SrLaGaO 4 (SLGO) and SrLaAlO 4 (SLAO)). We have studied thin films of the Pr 1– x Ca x MnO 3 manganite under hydrostatic pressure for various doping levels in order to induce a delocalization of carriers and destroy the charge ordered state (CO). It appears that both doping and the strains from the substrate can alter the CO state and tune the electrical properties of the compound. We have also proved that the application of an external hydrostatic pressure induces similar spectral modifications to doping in the Pr 1– x Ca x MnO 3 (LCMO) thin films. By our systematic Raman studies under varying external (temperature and pressure) and internal (interfacial strains and doping) conditions, we investigate certain modes and extract direct information about the amount of the Jahn–Teller (JT) distortions, the CO state, and the strain or pressure induced phase separation in the manganite thin films. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)