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Spin-entropy induced thermopower and spin-blockade effect in CoO
Max Planck Inst Solid State Res, Stuttgart Ctr Electron Microscopy, Heisenbergstr 1, D-70569 Stuttgart, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Max Planck Inst Solid State Res, Stuttgart Ctr Electron Microscopy, Heisenbergstr 1, D-70569 Stuttgart, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics. Royal Inst Technol KTH, Dept Mat & Engn, Appl Mat, S-10044 Stockholm, Sweden.ORCID iD: 0000-0003-1231-9994
2019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, no 14, article id 144108Article in journal (Refereed) Published
Abstract [en]

We report spin-entropy-induced thermopower and the occurrence of a spin-blockade effect in stoichiometric disordered CoO. Cation defect-driven distortion in the octahedral ligand field of CoO leads to a charge transfer process and favors the stabilization of Co+3 charge states at defect adjacent atomic sites. Moreover, a higher extent of local stoichiometric disruption triggers the spin crossover and magnetic collapse into a Co+3 state. Degenerated spin-orbital states on vacancy neighbored atomic sites render the spin-orbital degeneracy to enhance the thermopower in CoO. Furthermore, we unravel an operating spin-blockade effect in CoO. The localized combination of active magnetic states-high-spin Co+2 and neutral magnetic states-low-spin Co+3 on alternate atomic sites suppress the charge carrier hopping due to a spin blockade. In the pursuit of efficient thermoelectric material, the present investigation explores the potential of the recipe of spin entropy and defect-engineered CoO.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 100, no 14, article id 144108
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-397304DOI: 10.1103/PhysRevB.100.144108ISI: 000493514400002OAI: oai:DiVA.org:uu-397304DiVA, id: diva2:1375913
Funder
Swedish Research CouncilAvailable from: 2019-12-06 Created: 2019-12-06 Last updated: 2019-12-06Bibliographically approved

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Singh, DeobratAhuja, Rajeev

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