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Probing bipyramid microstructure of pure and Dy-doped HoMnO$_3$ using high pressure and low temperature studies
ARKADEV ROY HIMAL BHATT V SRIHARI H K POSWAL S R VISHWAKARMA
Volume 45 Published: 7 November 2022 Article ID 0224
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Keywords
Multiferroics ;low temperature ;infrared spectroscopy ;phonons ;manganites ;high pressure XRD. -
Abstract
Bipyramidal distortions play the governing role in physical properties of HoMnO$_3$ multiferroics. We have carried out angle-dispersive high pressure synchrotron X-ray diffraction experiments on hexagonal HoMnO$_3$ to find the evolution of bipyramidal parameters upon external compression. It is found that the average bond-lengths and bond-angles between Mn and O atoms depict significant reduction, which results in the distortion in MnO$_5$ bipyramidal structure athigh pressures. Further, since subtle variations in these distortions are used to compare the properties of hexagonal HoMnO$_3$ manganite series, in-situ low temperature infrared spectroscopic studies of 10% Dy-doped HoMnO$_3$ have beencarried out to study the effect of further increase in R-site cationic radius on MnO$_5$ deformations. It is found that the phonon modes specifically related to the motion of Mn and O atoms in ab-plane display irregularities near magnetic transition temperatures ($T_N$ and T$_{SR}$) via spin phonon coupling. Even a small increase in average ionic radius of rare-earth atom suppresses this anomalous behaviour and follows the trend of undoped hexagonal rare-earth manganites.
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Author Affiliations
ARKADEV ROY HIMAL BHATT1 V SRIHARI H K POSWAL S R VISHWAKARMA
- High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
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Dates
- Published
- 7 November 2022
- Manuscript received
- 29 June 2022
- Accepted
- 16 August 2022
- Final version published online
- 7 November 2022
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