Optical Study of the Electronic Structure and Lattice Dynamics of NdBaMn2O6 Single Crystals
We investigated the electronic structure and lattice dynamics of double perovskite NdBaMn 2 O 6 single crystals through spectroscopic ellipsometry and Raman scattering spectroscopy. The optical absorption band centered at approximately 0.88 eV was assigned to on-site d – d transitions in Mn, whereas...
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Published in | Scientific reports Vol. 9; no. 1; pp. 1 - 11 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
London
Nature Publishing Group UK
03.12.2019
Nature Publishing Group |
Subjects | |
Online Access | Get full text |
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Summary: | We investigated the electronic structure and lattice dynamics of double perovskite NdBaMn
2
O
6
single crystals through spectroscopic ellipsometry and Raman scattering spectroscopy. The optical absorption band centered at approximately 0.88 eV was assigned to on-site
d
–
d
transitions in Mn, whereas the optical feature at approximately 4.10 eV was assigned to charge-transfer transitions between the 2
p
state of O and 3
d
state of Mn. Analysis of the temperature dependence of the
d-d
transition indicated anomalies at 290 and 235 K. The activated phonon mode, which appeared at approximately 440 cm
−1
alongside with the enhancement of the 270 cm
−1
phonon mode, coupled strongly to the metal–insulator transition at 290 K, which was associated with a charge/orbital ordering. Moreover, the MnO
6
octahedral breathing mode at 610 cm
−1
exhibited softening at a temperature lower than 235 K (temperature of the antiferromagnetic phase transition), which revealed the strong coupling between the lattice and magnetic degrees of freedom. The spin–phonon coupling constant obtained was
λ
= 2.5 cm
−1
. These findings highlight the importance of charge–orbital–spin interactions in establishing NdBaMn
2
O
6
phases with novel properties. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 2045-2322 2045-2322 |
DOI: | 10.1038/s41598-019-54524-0 |