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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 universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
Max Planck Inst Solid State Res, Stuttgart Ctr Electron Microscopy, Heisenbergstr 1, D-70569 Stuttgart, Germany.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik. Royal Inst Technol KTH, Dept Mat & Engn, Appl Mat, S-10044 Stockholm, Sweden.ORCID-id: 0000-0003-1231-9994
2019 (engelsk)Inngår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, nr 14, artikkel-id 144108Artikkel i tidsskrift (Fagfellevurdert) 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.

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AMER PHYSICAL SOC , 2019. Vol. 100, nr 14, artikkel-id 144108
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URN: urn:nbn:se:uu:diva-397304DOI: 10.1103/PhysRevB.100.144108ISI: 000493514400002OAI: oai:DiVA.org:uu-397304DiVA, id: diva2:1375913
Forskningsfinansiär
Swedish Research CouncilTilgjengelig fra: 2019-12-06 Laget: 2019-12-06 Sist oppdatert: 2019-12-06bibliografisk kontrollert

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