329 citations
- Gustavo E. Romero2 profiles11 · h 8
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5 papers · 1 filter
Ab initio study of ferromagnetism induced by magnetic impurities in rutile TiO2
L. A. Errico, M. Weissmann, M. Renteria
Using the first-principles density-functional approach, magnetic properties of Mn-, Fe-, Co-, and Ni-doped rutile TiO2 were investigated for two different impurity concentrations (…
The role of metallic impurities in oxide semiconductors: first-principles calculations and PAC experiments
L. A. Errico, G. Fabricius, M. Renteria
We report an ab-initio comparative study of the electric-field-gradient tensor (EFG) and structural relaxations introduced by acceptor (Cd) and donor (Ta) impurities when they repl…
XAS study of the local environment of impurities in doped TiO2 thin films
C. E. Rodríguez Torres, A. F. Cabrera, L. A. Errico +4
In this work we present an X-ray Absorption Spectroscopy characterization of the local environment of the impurity in room temperature ferromagnetic anatase TiO2 thin films doped w…
Phonon Activity and a Possible Lattice Arrangement in the Intermediate Phase of YVO3
Nestor E. Massa, Cinthia Piamonteze, Helio C. N. Tolentino +3
We show that in YVO3 new hard phonons gradually become zone center active below ~210 K verifying that a lattice phase transition takes place at about that temperature. The Debye-Wa…
Small Polaron Localization, Jahn-Teller Distortion and Defects in La0.67Ca0.33MnO3: An Infrared Spectroscopy and X-ray Absorption Analysis
Nestor E. Massa, Helio C. N. Tolentino, Horacio Salva +3
We combine infrared reflectivity and EXAFS (Extended X-ray Absorption Fine Structure) techniques to study the solid solution La0.67Ca0.33MnO3 prepared by different methods yielding…