Anomalous Ca Content Dependence of Dielectric Properties of Charge-Ordered Pr<sub>1−<i>x</i></sub>Ca<i><sub>x</sub></i>MnO<sub>3</sub> as a Signature of Charge-Ordered Phase Modulation
Low-temperature dielectric properties of charge/orbital-ordered manganite, Pr<sub>1−<i>x</i></sub>Ca<i><sub>x</sub></i>MnO<sub>3</sub> for 0.40 ≤ <i>x</i> ≤ 0.50, was investigated systematically as a function of Ca content, <...
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MDPI AG
2022-10-01
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| Series: | Condensed Matter |
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| Online Access: | https://www.mdpi.com/2410-3896/7/4/58 |
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| author | Ankit Kumar Singh Partha Sarathi Mondal |
| author_facet | Ankit Kumar Singh Partha Sarathi Mondal |
| author_sort | Ankit Kumar Singh |
| collection | DOAJ |
| description | Low-temperature dielectric properties of charge/orbital-ordered manganite, Pr<sub>1−<i>x</i></sub>Ca<i><sub>x</sub></i>MnO<sub>3</sub> for 0.40 ≤ <i>x</i> ≤ 0.50, was investigated systematically as a function of Ca content, <i>x</i>. The Ca content dependence of dielectric permittivity and dissipation factor exhibited distinct maxima near <i>x</i>~0.45. The overall dielectric response of charge-ordered Pr<sub>1−<i>x</i></sub>Ca<i><sub>x</sub></i>MnO<sub>3</sub> was dominated by dielectric polarization induced by polaron hopping and exhibited thermally activated relaxation behaviour. The thermally activated dielectric relaxation behaviour over the investigated temperature range was further analysed with the help of two models: the small polaron hopping model and the Mott three-dimensional variable range hopping model. The estimated polaron transport parameters also displayed non-monotonic variation with <i>x</i> and exhibited a broad minima between <i>x</i> = 0.425 and 0.45. Considering the previous work reported so far, the charge order pattern of Pr<sub>1−<i>x</i></sub>Ca<i><sub>x</sub></i>MnO<sub>3</sub> below <i>x</i> = 0.425 was most likely to be of Zener-polaron type, while near <i>x</i> = 0.50 was checker-board type and for in-between compositions; neither pure checker-board type nor pure Zener-polaron type can be considered a ground state. The observed results suggest that a modulation of the checkerboard-type charge/orbital ordering pattern in Pr<sub>1−<i>x</i></sub>Ca<i><sub>x</sub></i>MnO<sub>3</sub> possibly takes place in the Ca content range of investigation, 0.40 ≤ <i>x</i> ≤ 0.50. |
| first_indexed | 2024-03-09T17:10:44Z |
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| institution | Directory Open Access Journal |
| issn | 2410-3896 |
| language | English |
| last_indexed | 2024-03-09T17:10:44Z |
| publishDate | 2022-10-01 |
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| record_format | Article |
| series | Condensed Matter |
| spelling | doaj.art-d5ed6321faf142b3b584fed3d666395c2023-11-24T14:07:44ZengMDPI AGCondensed Matter2410-38962022-10-01745810.3390/condmat7040058Anomalous Ca Content Dependence of Dielectric Properties of Charge-Ordered Pr<sub>1−<i>x</i></sub>Ca<i><sub>x</sub></i>MnO<sub>3</sub> as a Signature of Charge-Ordered Phase ModulationAnkit Kumar Singh0Partha Sarathi Mondal1Department of Applied Sciences and Humanities, National Institute of Advanced Manufacturing Technology, Ranchi 834003, IndiaDepartment of Applied Sciences and Humanities, National Institute of Advanced Manufacturing Technology, Ranchi 834003, IndiaLow-temperature dielectric properties of charge/orbital-ordered manganite, Pr<sub>1−<i>x</i></sub>Ca<i><sub>x</sub></i>MnO<sub>3</sub> for 0.40 ≤ <i>x</i> ≤ 0.50, was investigated systematically as a function of Ca content, <i>x</i>. The Ca content dependence of dielectric permittivity and dissipation factor exhibited distinct maxima near <i>x</i>~0.45. The overall dielectric response of charge-ordered Pr<sub>1−<i>x</i></sub>Ca<i><sub>x</sub></i>MnO<sub>3</sub> was dominated by dielectric polarization induced by polaron hopping and exhibited thermally activated relaxation behaviour. The thermally activated dielectric relaxation behaviour over the investigated temperature range was further analysed with the help of two models: the small polaron hopping model and the Mott three-dimensional variable range hopping model. The estimated polaron transport parameters also displayed non-monotonic variation with <i>x</i> and exhibited a broad minima between <i>x</i> = 0.425 and 0.45. Considering the previous work reported so far, the charge order pattern of Pr<sub>1−<i>x</i></sub>Ca<i><sub>x</sub></i>MnO<sub>3</sub> below <i>x</i> = 0.425 was most likely to be of Zener-polaron type, while near <i>x</i> = 0.50 was checker-board type and for in-between compositions; neither pure checker-board type nor pure Zener-polaron type can be considered a ground state. The observed results suggest that a modulation of the checkerboard-type charge/orbital ordering pattern in Pr<sub>1−<i>x</i></sub>Ca<i><sub>x</sub></i>MnO<sub>3</sub> possibly takes place in the Ca content range of investigation, 0.40 ≤ <i>x</i> ≤ 0.50.https://www.mdpi.com/2410-3896/7/4/58manganitecharge/orbital orderingdielectric propertiespolaron |
| spellingShingle | Ankit Kumar Singh Partha Sarathi Mondal Anomalous Ca Content Dependence of Dielectric Properties of Charge-Ordered Pr<sub>1−<i>x</i></sub>Ca<i><sub>x</sub></i>MnO<sub>3</sub> as a Signature of Charge-Ordered Phase Modulation Condensed Matter manganite charge/orbital ordering dielectric properties polaron |
| title | Anomalous Ca Content Dependence of Dielectric Properties of Charge-Ordered Pr<sub>1−<i>x</i></sub>Ca<i><sub>x</sub></i>MnO<sub>3</sub> as a Signature of Charge-Ordered Phase Modulation |
| title_full | Anomalous Ca Content Dependence of Dielectric Properties of Charge-Ordered Pr<sub>1−<i>x</i></sub>Ca<i><sub>x</sub></i>MnO<sub>3</sub> as a Signature of Charge-Ordered Phase Modulation |
| title_fullStr | Anomalous Ca Content Dependence of Dielectric Properties of Charge-Ordered Pr<sub>1−<i>x</i></sub>Ca<i><sub>x</sub></i>MnO<sub>3</sub> as a Signature of Charge-Ordered Phase Modulation |
| title_full_unstemmed | Anomalous Ca Content Dependence of Dielectric Properties of Charge-Ordered Pr<sub>1−<i>x</i></sub>Ca<i><sub>x</sub></i>MnO<sub>3</sub> as a Signature of Charge-Ordered Phase Modulation |
| title_short | Anomalous Ca Content Dependence of Dielectric Properties of Charge-Ordered Pr<sub>1−<i>x</i></sub>Ca<i><sub>x</sub></i>MnO<sub>3</sub> as a Signature of Charge-Ordered Phase Modulation |
| title_sort | anomalous ca content dependence of dielectric properties of charge ordered pr sub 1 i x i sub ca i sub x sub i mno sub 3 sub as a signature of charge ordered phase modulation |
| topic | manganite charge/orbital ordering dielectric properties polaron |
| url | https://www.mdpi.com/2410-3896/7/4/58 |
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