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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 Univ, Dept Phys & Astron, Condensed Matter Theory Grp, Box 516, S-77120 Uppsala, Sweden..
Max Planck Inst Solid State Res, Stuttgart Ctr Electron Microscopy, Heisenbergstr 1, D-70569 Stuttgart, Germany..
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.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:kth:diva-264161DOI: 10.1103/PhysRevB.100.144108ISI: 000493514400002Scopus ID: 2-s2.0-85075009235OAI: oai:DiVA.org:kth-264161DiVA, id: diva2:1376922
Note

QC 20191210

Available from: 2019-12-10 Created: 2019-12-10 Last updated: 2020-01-29Bibliographically approved

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Ahuja, Rajeev

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