Phonon activity upon reducing ARuO3-δ (A = Ca, Sr)

We present infrared reflectivity and transmission spectra from 30 to 25000 cm-1 of the perovskites CaRuO3-δ and SrRuO3-δ annealed in argon atmosphere and measured at room temperature and 77 K. The structural and physical consequences upon deoxygenation of CaRuO3-δ and SrRuO3-δ are found in the infra...

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Autores principales: De La Cruz, F.P., Massa, N.E., Nassif, V.M., Cuffini, S.L., Carbonio, R.E., Salva, H.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_03701972_v220_n1_p603_DeLaCruz
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_03701972_v220_n1_p603_DeLaCruz2023-10-03T15:28:34Z Phonon activity upon reducing ARuO3-δ (A = Ca, Sr) De La Cruz, F.P. Massa, N.E. Nassif, V.M. Cuffini, S.L. Carbonio, R.E. Salva, H. We present infrared reflectivity and transmission spectra from 30 to 25000 cm-1 of the perovskites CaRuO3-δ and SrRuO3-δ annealed in argon atmosphere and measured at room temperature and 77 K. The structural and physical consequences upon deoxygenation of CaRuO3-δ and SrRuO3-δ are found in the infrared spectra as a decrease of the plasma frequency, implying fewer effective carriers, and the appearance of phonon bands at 337, 873, and 1436 cm-1. This allows us to infer that deoxygenation mechanisms generate metal-insulator transitions and perhaps spin reordering. Comparing with the data of untreated CaRuO3 and SrRuO3 samples, the influence of the lattice on the optical conductivity became evident. Our overall results suggest that a polaronic environment may provide for the lower energy extra anomalies in the electrodynamic quantities as recently established by Ahn et al. (Phys. Rev. Lett. 82, 5321 (1999)). JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03701972_v220_n1_p603_DeLaCruz
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description We present infrared reflectivity and transmission spectra from 30 to 25000 cm-1 of the perovskites CaRuO3-δ and SrRuO3-δ annealed in argon atmosphere and measured at room temperature and 77 K. The structural and physical consequences upon deoxygenation of CaRuO3-δ and SrRuO3-δ are found in the infrared spectra as a decrease of the plasma frequency, implying fewer effective carriers, and the appearance of phonon bands at 337, 873, and 1436 cm-1. This allows us to infer that deoxygenation mechanisms generate metal-insulator transitions and perhaps spin reordering. Comparing with the data of untreated CaRuO3 and SrRuO3 samples, the influence of the lattice on the optical conductivity became evident. Our overall results suggest that a polaronic environment may provide for the lower energy extra anomalies in the electrodynamic quantities as recently established by Ahn et al. (Phys. Rev. Lett. 82, 5321 (1999)).
format JOUR
author De La Cruz, F.P.
Massa, N.E.
Nassif, V.M.
Cuffini, S.L.
Carbonio, R.E.
Salva, H.
spellingShingle De La Cruz, F.P.
Massa, N.E.
Nassif, V.M.
Cuffini, S.L.
Carbonio, R.E.
Salva, H.
Phonon activity upon reducing ARuO3-δ (A = Ca, Sr)
author_facet De La Cruz, F.P.
Massa, N.E.
Nassif, V.M.
Cuffini, S.L.
Carbonio, R.E.
Salva, H.
author_sort De La Cruz, F.P.
title Phonon activity upon reducing ARuO3-δ (A = Ca, Sr)
title_short Phonon activity upon reducing ARuO3-δ (A = Ca, Sr)
title_full Phonon activity upon reducing ARuO3-δ (A = Ca, Sr)
title_fullStr Phonon activity upon reducing ARuO3-δ (A = Ca, Sr)
title_full_unstemmed Phonon activity upon reducing ARuO3-δ (A = Ca, Sr)
title_sort phonon activity upon reducing aruo3-δ (a = ca, sr)
url http://hdl.handle.net/20.500.12110/paper_03701972_v220_n1_p603_DeLaCruz
work_keys_str_mv AT delacruzfp phononactivityuponreducingaruo3dacasr
AT massane phononactivityuponreducingaruo3dacasr
AT nassifvm phononactivityuponreducingaruo3dacasr
AT cuffinisl phononactivityuponreducingaruo3dacasr
AT carboniore phononactivityuponreducingaruo3dacasr
AT salvah phononactivityuponreducingaruo3dacasr
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