The question whether ferroelectricity (FE) may coexist with a metallic or highly conducting state or rather it must be suppressed by the screening from the free charges is the focus of a rapidly increasing number of theoretical studies and is finally receiving positive experimental responses. The issue is closely related to the thermoelectric and multiferroic (also magnetic) applications of FE materials where the electrical conductivity is required or spurious. In these circumstances, the traditional methods for probing ferroelectricity are hampered or made totally ineffective by the free charges, which screen the polar response to an external electric field. This fact may explain why more than 40 years passed among the first proposals of FE metals and the present experimental and theoretical activities. The measurement of the elastic moduli, Young's modulus in the present case, versus temperature is an effective method for studying the influence of doping on a FE transition because the elastic properties are unaffected by electrical conductivity. In this manner, it is shown that the FE transitions of BaTiO3-δ are not suppressed by electron doping through O vacancies; only the onset temperatures are depressed, but the magnitudes of the softenings, and hence of the piezoelectric activity, are initially even increased.

Probing ferroelectricity in highly conducting materials through their elastic response: Persistence of ferroelectricity in metallic BaTiO3-δ / Cordero, F.; Trequattrini, F.; Craciun, F.; Langhammer, H. T.; Quiroga, D. A. B.; Silva, P. S.. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 99:6(2019), pp. 1-10. [10.1103/PhysRevB.99.064106]

Probing ferroelectricity in highly conducting materials through their elastic response: Persistence of ferroelectricity in metallic BaTiO3-δ

Trequattrini, F.
Membro del Collaboration Group
;
2019

Abstract

The question whether ferroelectricity (FE) may coexist with a metallic or highly conducting state or rather it must be suppressed by the screening from the free charges is the focus of a rapidly increasing number of theoretical studies and is finally receiving positive experimental responses. The issue is closely related to the thermoelectric and multiferroic (also magnetic) applications of FE materials where the electrical conductivity is required or spurious. In these circumstances, the traditional methods for probing ferroelectricity are hampered or made totally ineffective by the free charges, which screen the polar response to an external electric field. This fact may explain why more than 40 years passed among the first proposals of FE metals and the present experimental and theoretical activities. The measurement of the elastic moduli, Young's modulus in the present case, versus temperature is an effective method for studying the influence of doping on a FE transition because the elastic properties are unaffected by electrical conductivity. In this manner, it is shown that the FE transitions of BaTiO3-δ are not suppressed by electron doping through O vacancies; only the onset temperatures are depressed, but the magnitudes of the softenings, and hence of the piezoelectric activity, are initially even increased.
2019
Condensed Matter Physics; Ferroelectricity; elastic properties
01 Pubblicazione su rivista::01a Articolo in rivista
Probing ferroelectricity in highly conducting materials through their elastic response: Persistence of ferroelectricity in metallic BaTiO3-δ / Cordero, F.; Trequattrini, F.; Craciun, F.; Langhammer, H. T.; Quiroga, D. A. B.; Silva, P. S.. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 99:6(2019), pp. 1-10. [10.1103/PhysRevB.99.064106]
File allegati a questo prodotto
File Dimensione Formato  
Probing_ferroelectricity_2019.pdf

solo gestori archivio

Tipologia: Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 677.36 kB
Formato Adobe PDF
677.36 kB Adobe PDF   Contatta l'autore

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1240963
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 22
  • ???jsp.display-item.citation.isi??? 22
social impact