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  Effective masses of electrons in n-type SrTiO3 determined from low-temperature specific heat capacities

Ahrens, M., Merkle, R., Rahmati, B., & Maier, J. (2007). Effective masses of electrons in n-type SrTiO3 determined from low-temperature specific heat capacities. Physica B, 393(1-2), 239-248.

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Ahrens, M.1, Autor           
Merkle, R.1, Autor           
Rahmati, B.1, Autor           
Maier, J.1, Autor           
Affiliations:
1Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370483              

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Schlagwörter: effective mass; band structure; phonon states; heat capacity; defect levels
 Zusammenfassung: We measured the low-temperature specific heat of Nb-doped and reduced (hydrogen treated) n-type SrTiO3 ranging from about 1.5 to 100 K. Displaying the data by the usual C-p/T vs. T-2 plot and applying a linear fit to the proper temperature range, the electronic density-of-states effective mass MD is derived resulting in m(D)/m(0) = 1.9 (+/- 0.1) for polycrystalline SrTiO3:Nb (5 at%) and m(D)/m(0) = 1.8 (+/- 0.2) for a reduced SrTiO3 single crystal. These results are in reasonable agreement with theoretical predictions, while in parts significantly deviating from experimentally obtained values, presented in literature. As far as specific heat measurements are concerned, we suggest that the higher values stated in most literature studies are due to an incorrect evaluation of specific heat data, as in n-type SrTiO3 one has to take care about a specific heat anomaly below about 5 K. Thermo-gravimetric oxidation of a reduced crystal combined with a Hall effect measurement leads to the conclusion that oxygen vacancies in this sample were doubly ionised even at liquid helium temperatures. (c) 2007 Elsevier B.V. All rights reserved.

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Sprache(n): eng - English
 Datum: 2007
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: eDoc: 338593
ISI: 000246242500040
 Art des Abschluß: -

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Titel: Physica B
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 393 (1-2) Artikelnummer: - Start- / Endseite: 239 - 248 Identifikator: ISSN: 0921-4526