Point defect distribution in high-mobility conductive SrTiO3 crystals

Znanstveni rad - Izvorni znanstveni rad

• Autor: A. Gentils
• Autor: O. Copie
• Autor: G. Herranz
• Autor: F. Fortuna
• Autor: M. Bibes
• Autor: K. Bouzehouane
• Autor: E. Jacquet
• Autor: C. Carretero
• Autor: Mario Basletić
• Autor: Emil Tafra
• Autor: Amir Hamzić
• Autor: A. Barthelemy
• Autorova ustanova: Sveučilište u Zagrebu; Prirodoslovno-matematički fakultet; (Fizički odsjek)
• Znanstveno / umjetničko područje, polje i grana: PRIRODNE ZNANOSTI; Fizika

Sažetak (engleski)

We have carried out positron annihilation spectroscopy to characterize the spatial distribution and the nature of vacancy defects in insulating as-received as well as in reduced SrTiO3 substrates exhibiting high-mobility conduction. The substrates were reduced either by ion etching the substrate surfaces or by doping with vacancies during thin film deposition at low pressure and high temperature. We show that Ti-vacancies are native defects homogeneously distributed in as-received substrates. In contrast, the dominant vacancy defects are the same both in ion-etched and substrates reduced during the film growth, and they consist of non-homogeneous distributions of cation-oxygen vacancy complexes. Their spatial extension is tuned from a few microns in ion-etched samples to the whole substrate in specimens reduced during film deposition. Our results shed light on the transport mechanisms of conductive SrTiO3 crystals and on strategies for defect-engineered oxide quantum wells, wires and dots.

• Ključne riječi (engleski): positron annihilation; point defects; defect clusters; ion radiation effects
• Jezik: engleski
• Vrsta publikacije: Znanstveni rad - Izvorni znanstveni rad
• Status objave: Objavljen
• Vrsta recenzije: Recenziran - međunarodna recenzija
• Verzija publikacije: Objavljena verzija rada (izdavačev PDF)
• Naslov časopisa: Physical review B: Condensed matter and materials physics
• Brojčani podaci: vol. 81, br. 14, 144109
• p-ISSN: 1098-0121
• e-ISSN: 1550-235X
• DOI: https://doi.org/10.1103/PhysRevB.81.144109
• URN:NBN: urn:nbn:hr:217:711002
• Datum objave publikacije: 2010
• Projekt: Šifra: 119-1191458-1023; Naziv (hrvatski): Sustavi s prostornim i dimenzijskim ograničenjima: korelacije i spinski efekti; Voditelj: Amir Hamzić; Pravna nadležnost: Hrvatska; Financijer: MZOS; Linija financiranja: ZP
• URL dokumenta: http://link.aps.org/doi/10.1103/PhysRevB.81.144109
• Vrsta resursa: Tekst
• Prava pristupa: Otvoreni pristup
• Javna napomena: Copyright (2010) by the American Physical Society. Received 20 January 2010; revised manuscript received 8 March 2010; published 13 April 2010.
• Datum i vrijeme pohrane: 2019-11-02 17:35:49