Here, we report the temperature-dependent electrical resistivity and thermopower of hole (Sr) and electron (Hf) doped LaCoO3 in the range of 303–753 K. With increasing temperature, the insulating behavior (303–503 K) with dominance of small polaron hopping to metallic transition (>503 K) is observed. The electron doped sample shows an insulating behavior and positive thermopower (139 μV K−1) value due to the spin state blockade, i.e., electron hopping from high spin Co2+ to low spin Co3+ is strongly inhibited. The calculated weighted mobility of validates the observed spin blockade mechanism in electron doped LaCoO3. The fluctuation of spin/orbital ordering and point defect scattering results in the low thermal conductivity of for Hf doped LaCoO3. The spin state blockade observed in the electrical resistivity and low lattice thermal conductivity reveals that spin state transition drives the thermoelectric response in Mott insulator LaCoO3.
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15 July 2024
Research Article|
July 15 2024
Spin state driven weighted mobility and thermal conductivity properties of electron (Hf) doped strongly correlated Mott insulator LaCoO3 for thermoelectric applications
Mohamed Jibri K. P.
;
Mohamed Jibri K. P.
(Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Project administration, Resources, Software, Writing – original draft, Writing – review & editing)
1
Functional Materials and Energy Devices Laboratory, Department of Physics and Nanotechnology, SRM Institute of Science and Technology
, Kattankulathur 603203, India
2
Center of Excellence in Materials and Advanced Technologies (CeMAT), Faculty of Engineering and Technology, SRM institute of Science and Technology
, Kattankulathur 603203, India
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Simon Sajan John
;
Simon Sajan John
(Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Software, Writing – original draft, Writing – review & editing)
3
Nanotechnology Research Center (NRC), Faculty of Engineering and Technology, SRM institute of Science and Technology
, Kattankulathur 603203, India
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Archana J.
;
Archana J.
(Data curation, Formal analysis, Investigation, Resources, Software, Validation, Visualization)
1
Functional Materials and Energy Devices Laboratory, Department of Physics and Nanotechnology, SRM Institute of Science and Technology
, Kattankulathur 603203, India
2
Center of Excellence in Materials and Advanced Technologies (CeMAT), Faculty of Engineering and Technology, SRM institute of Science and Technology
, Kattankulathur 603203, India
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Harish S.;
Harish S.
a)
(Data curation, Formal analysis, Resources, Supervision, Validation, Visualization)
1
Functional Materials and Energy Devices Laboratory, Department of Physics and Nanotechnology, SRM Institute of Science and Technology
, Kattankulathur 603203, India
2
Center of Excellence in Materials and Advanced Technologies (CeMAT), Faculty of Engineering and Technology, SRM institute of Science and Technology
, Kattankulathur 603203, India
a)Authors to whom correspondence should be addressed: aravindharri@gmail.com and m.navaneethan@gmail.com
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Navaneethan M.
Navaneethan M.
a)
(Data curation, Formal analysis, Project administration, Resources, Supervision, Visualization, Writing – review & editing)
1
Functional Materials and Energy Devices Laboratory, Department of Physics and Nanotechnology, SRM Institute of Science and Technology
, Kattankulathur 603203, India
2
Center of Excellence in Materials and Advanced Technologies (CeMAT), Faculty of Engineering and Technology, SRM institute of Science and Technology
, Kattankulathur 603203, India
3
Nanotechnology Research Center (NRC), Faculty of Engineering and Technology, SRM institute of Science and Technology
, Kattankulathur 603203, India
a)Authors to whom correspondence should be addressed: aravindharri@gmail.com and m.navaneethan@gmail.com
Search for other works by this author on:
a)Authors to whom correspondence should be addressed: aravindharri@gmail.com and m.navaneethan@gmail.com
Appl. Phys. Lett. 125, 034101 (2024)
Article history
Received:
March 06 2024
Accepted:
June 15 2024
Citation
Mohamed Jibri K. P., Simon Sajan John, Archana J., Harish S., Navaneethan M.; Spin state driven weighted mobility and thermal conductivity properties of electron (Hf) doped strongly correlated Mott insulator LaCoO3 for thermoelectric applications. Appl. Phys. Lett. 15 July 2024; 125 (3): 034101. https://doi.org/10.1063/5.0207132
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