Photoluminescence and time-resolved spectroscopy in multiferroic BiFeO3: Effects of electric fields and sample aging

Avneesh Anshul; Ashok Kumar; Bipin K. Gupta; R. K. Kotnala; J. F. Scott; R. S. Katiyar

doi:10.1063/1.4808450

Photoluminescence and time-resolved spectroscopy in multiferroic BiFeO3: Effects of electric fields and sample aging

Avneesh Anshul, Ashok Kumar^*, Bipin K. Gupta, R. K. Kotnala, J. F. Scott, R. S. Katiyar

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

We report photoluminescence and time-resolved spectroscopy in bismuth ferrite excited with a 325 nm source. The direct-bandgap recombinations near 2.55 eV and indirect-bandgap transitions near 2.67 eV are presented as functions of applied in-plane electric field with recombination time in the microsecond regime. The applied field moves some conduction electrons away from the Brillouin zone center, increasing significantly the intensity of indirect-gap recombination. An aging phenomenon is manifest in specimens stored for more than twelve months under ambient conditions. Effect of external magnetic field on the surface phase transition is negligible up to H = 0.5 T. (C) 2013 AIP Publishing LLC.

Original language	English
Article number	222901
Number of pages	5
Journal	Applied Physics Letters
Volume	102
Issue number	22
DOIs	https://doi.org/10.1063/1.4808450
Publication status	Published - 3 Jun 2013

Keywords

PMN-XPT
1ST-PRINCIPLES

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10.1063/1.4808450

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title = "Photoluminescence and time-resolved spectroscopy in multiferroic BiFeO3: Effects of electric fields and sample aging",

abstract = "We report photoluminescence and time-resolved spectroscopy in bismuth ferrite excited with a 325 nm source. The direct-bandgap recombinations near 2.55 eV and indirect-bandgap transitions near 2.67 eV are presented as functions of applied in-plane electric field with recombination time in the microsecond regime. The applied field moves some conduction electrons away from the Brillouin zone center, increasing significantly the intensity of indirect-gap recombination. An aging phenomenon is manifest in specimens stored for more than twelve months under ambient conditions. Effect of external magnetic field on the surface phase transition is negligible up to H = 0.5 T. (C) 2013 AIP Publishing LLC.",

keywords = "PMN-XPT, 1ST-PRINCIPLES",

author = "Avneesh Anshul and Ashok Kumar and Gupta, {Bipin K.} and Kotnala, {R. K.} and Scott, {J. F.} and Katiyar, {R. S.}",

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month = jun,

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doi = "10.1063/1.4808450",

language = "English",

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journal = "Applied Physics Letters",

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TY - JOUR

T1 - Photoluminescence and time-resolved spectroscopy in multiferroic BiFeO3

T2 - Effects of electric fields and sample aging

AU - Anshul, Avneesh

AU - Kumar, Ashok

AU - Gupta, Bipin K.

AU - Kotnala, R. K.

AU - Scott, J. F.

AU - Katiyar, R. S.

PY - 2013/6/3

Y1 - 2013/6/3

N2 - We report photoluminescence and time-resolved spectroscopy in bismuth ferrite excited with a 325 nm source. The direct-bandgap recombinations near 2.55 eV and indirect-bandgap transitions near 2.67 eV are presented as functions of applied in-plane electric field with recombination time in the microsecond regime. The applied field moves some conduction electrons away from the Brillouin zone center, increasing significantly the intensity of indirect-gap recombination. An aging phenomenon is manifest in specimens stored for more than twelve months under ambient conditions. Effect of external magnetic field on the surface phase transition is negligible up to H = 0.5 T. (C) 2013 AIP Publishing LLC.

AB - We report photoluminescence and time-resolved spectroscopy in bismuth ferrite excited with a 325 nm source. The direct-bandgap recombinations near 2.55 eV and indirect-bandgap transitions near 2.67 eV are presented as functions of applied in-plane electric field with recombination time in the microsecond regime. The applied field moves some conduction electrons away from the Brillouin zone center, increasing significantly the intensity of indirect-gap recombination. An aging phenomenon is manifest in specimens stored for more than twelve months under ambient conditions. Effect of external magnetic field on the surface phase transition is negligible up to H = 0.5 T. (C) 2013 AIP Publishing LLC.

KW - PMN-XPT

KW - 1ST-PRINCIPLES

U2 - 10.1063/1.4808450

DO - 10.1063/1.4808450

M3 - Article

SN - 0003-6951

VL - 102

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 22

M1 - 222901

ER -

Photoluminescence and time-resolved spectroscopy in multiferroic BiFeO3: Effects of electric fields and sample aging

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