Optical properties of small polaron in Mn1.56Co0.96Ni0.48O4 films investigated by temperature-dependent transmission spectra

J. Wu; C. Ouyang; W. Zhou; Y. Q. Gao; Y. Hou; Z. M. Huang; J. H. Chu

doi:10.1088/2053-1591/2/2/026301

Optical properties of small polaron in Mn_1.56Co_0.96Ni_0.48O₄ films investigated by temperature-dependent transmission spectra

J. Wu, C. Ouyang, W. Zhou, Y. Q. Gao, Y. Hou, Z. M. Huang, J. H. Chu

CAS - Shanghai Institute of Technical Physics

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

3 Scopus citations

Abstract

Temperature-dependent transmission spectra ofMn_1.56Co_0.96Ni_0.48O₄ (MCNO) films on Al₂O₃ substrate have been measured in 1.5-5.5 μmwavelength range. Adispersion relation that combines Lorentz oscillator model and Cauchy model is successfully adopted to describe the optical properties of small polaron in MCNO films. An absorption peak at around 0.8 eV which corresponds to the center energy of Lorentz oscillator is unveiled to be due to the small polaron hopping from Mn³⁺ state (lower Hubbard band ) toMn⁴⁺ state (upper Hubbard band). The regularity of temperature dependent peak position shows that above the magnetic transition temperature (∼200 K) the peak position varies slightly, while below this temperature it varies more obviously. This phenomenon can be explained by the fact that the buildup of magnetic order leads to the localized electron states gradually withdrawing from the Hubbard band gap.

Original language	English
Article number	026301
Journal	Materials Research Express
Volume	2
Issue number	2
DOIs	https://doi.org/10.1088/2053-1591/2/2/026301
State	Published - Feb 2015
Externally published	Yes

Keywords

Hopping conductivity
Small polaron
Transmission spectrum

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10.1088/2053-1591/2/2/026301

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@article{975abada969f4d81abeb6b694319c333,

title = "Optical properties of small polaron in Mn1.56Co0.96Ni0.48O4 films investigated by temperature-dependent transmission spectra",

abstract = "Temperature-dependent transmission spectra ofMn1.56Co0.96Ni0.48O4 (MCNO) films on Al2O3 substrate have been measured in 1.5-5.5 μmwavelength range. Adispersion relation that combines Lorentz oscillator model and Cauchy model is successfully adopted to describe the optical properties of small polaron in MCNO films. An absorption peak at around 0.8 eV which corresponds to the center energy of Lorentz oscillator is unveiled to be due to the small polaron hopping from Mn3+ state (lower Hubbard band ) toMn4+ state (upper Hubbard band). The regularity of temperature dependent peak position shows that above the magnetic transition temperature (∼200 K) the peak position varies slightly, while below this temperature it varies more obviously. This phenomenon can be explained by the fact that the buildup of magnetic order leads to the localized electron states gradually withdrawing from the Hubbard band gap.",

keywords = "Hopping conductivity, Small polaron, Transmission spectrum",

author = "J. Wu and C. Ouyang and W. Zhou and Gao, \{Y. Q.\} and Y. Hou and Huang, \{Z. M.\} and Chu, \{J. H.\}",

note = "Publisher Copyright: {\textcopyright} 2015 IOP Publishing Ltd.",

year = "2015",

month = feb,

doi = "10.1088/2053-1591/2/2/026301",

language = "英语",

volume = "2",

journal = "Materials Research Express",

issn = "2053-1591",

publisher = "IOP Publishing Ltd.",

number = "2",

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TY - JOUR

T1 - Optical properties of small polaron in Mn1.56Co0.96Ni0.48O4 films investigated by temperature-dependent transmission spectra

AU - Wu, J.

AU - Ouyang, C.

AU - Zhou, W.

AU - Gao, Y. Q.

AU - Hou, Y.

AU - Huang, Z. M.

AU - Chu, J. H.

PY - 2015/2

Y1 - 2015/2

N2 - Temperature-dependent transmission spectra ofMn1.56Co0.96Ni0.48O4 (MCNO) films on Al2O3 substrate have been measured in 1.5-5.5 μmwavelength range. Adispersion relation that combines Lorentz oscillator model and Cauchy model is successfully adopted to describe the optical properties of small polaron in MCNO films. An absorption peak at around 0.8 eV which corresponds to the center energy of Lorentz oscillator is unveiled to be due to the small polaron hopping from Mn3+ state (lower Hubbard band ) toMn4+ state (upper Hubbard band). The regularity of temperature dependent peak position shows that above the magnetic transition temperature (∼200 K) the peak position varies slightly, while below this temperature it varies more obviously. This phenomenon can be explained by the fact that the buildup of magnetic order leads to the localized electron states gradually withdrawing from the Hubbard band gap.

AB - Temperature-dependent transmission spectra ofMn1.56Co0.96Ni0.48O4 (MCNO) films on Al2O3 substrate have been measured in 1.5-5.5 μmwavelength range. Adispersion relation that combines Lorentz oscillator model and Cauchy model is successfully adopted to describe the optical properties of small polaron in MCNO films. An absorption peak at around 0.8 eV which corresponds to the center energy of Lorentz oscillator is unveiled to be due to the small polaron hopping from Mn3+ state (lower Hubbard band ) toMn4+ state (upper Hubbard band). The regularity of temperature dependent peak position shows that above the magnetic transition temperature (∼200 K) the peak position varies slightly, while below this temperature it varies more obviously. This phenomenon can be explained by the fact that the buildup of magnetic order leads to the localized electron states gradually withdrawing from the Hubbard band gap.

KW - Hopping conductivity

KW - Small polaron

KW - Transmission spectrum

UR - https://www.scopus.com/pages/publications/84953432583

U2 - 10.1088/2053-1591/2/2/026301

DO - 10.1088/2053-1591/2/2/026301

M3 - 文章

AN - SCOPUS:84953432583

SN - 2053-1591

VL - 2

JO - Materials Research Express

JF - Materials Research Express

IS - 2

M1 - 026301

ER -

Optical properties of small polaron in Mn_1.56Co_0.96Ni_0.48O₄ films investigated by temperature-dependent transmission spectra

Abstract

Keywords

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