Dielectric response to the low-temperature magnetic defect structure and spin state transition in polycrystalline LaCoO_(3)
| dc.contributor.author | Schmidt, Rainer | |
| dc.contributor.author | Wu, J. | |
| dc.contributor.author | Leighton, C. | |
| dc.contributor.author | Terry, I. | |
| dc.date.accessioned | 2023-06-20T03:56:58Z | |
| dc.date.available | 2023-06-20T03:56:58Z | |
| dc.date.issued | 2009-03 | |
| dc.description | © 2009 The American Physical Society. The authors wish to thank Neil Hyatt, Derek Sinclair, and Sean Giblin for useful discussions. | |
| dc.description.abstract | The dielectric and magnetic properties and their correlations were investigated in polycrystalline perovskite LaCoO_(3). The intrinsic bulk and grain-boundary (GB) dielectric relaxation processes were deconvoluted using impedance spectroscopy between 20 and 120 K, and resistivity and capacitance were analyzed separately. A thermally induced magnetic transition from a Co^(3+) low-spin (LS) (S=0;t^(6)_(2g)e^(0)_(g)) to a higher spin state occurs at T_(s1) ≈ 80 K, which is controversial in nature and has been suggested to be an intermediate-spin (IS) state (S=1;t^(5)_(2g)e^(1)_(g)) or a high-spin(HS) state (S=2;t^(4)_(2g)e^(2)_(g)) transition. This spin state transition was confirmed by magnetic-susceptibility measurements and was reflected in the impedance by a split of the single GB relaxation process into two coexisting contributions. This apparent electronic phase coexistence at T > 80 K was interpreted as a reflection of the coexistence of magnetic LS and IS/HS states. At lower temperatures (T ≤ 40 K) perceptible variation in bulk dielectric permittivity with temperature appeared to be correlated with the magnetic susceptibility associated with a magnetic defect structure. At 40 K < T < T_(s1), separated GB and bulk resistivity vs T curves were consistent with localized polaron Mott variable-range hopping (VRH) based on impurity conduction. Below 40 K, a crossover from impurity Mott’s VRH to another type of thermally activated charge transport was detected, which was correlated with the appearance of the defect-related magnetism. | |
| dc.description.department | Depto. de Estructura de la Materia, Física Térmica y Electrónica | |
| dc.description.faculty | Fac. de Ciencias Físicas | |
| dc.description.refereed | TRUE | |
| dc.description.status | pub | |
| dc.eprint.id | https://eprints.ucm.es/id/eprint/32655 | |
| dc.identifier.doi | 10.1103/PhysRevB.79.125105 | |
| dc.identifier.issn | 1098-0121 | |
| dc.identifier.officialurl | http://dx.doi.org/10.1103/PhysRevB.79.125105 | |
| dc.identifier.relatedurl | http://journals.aps.org/ | |
| dc.identifier.uri | https://hdl.handle.net/20.500.14352/44712 | |
| dc.issue.number | 12 | |
| dc.journal.title | Physical review B | |
| dc.language.iso | spa | |
| dc.publisher | American Physical Society | |
| dc.rights.accessRights | open access | |
| dc.subject.cdu | 537 | |
| dc.subject.keyword | Metal transition. | |
| dc.subject.ucm | Electricidad | |
| dc.subject.ucm | Electrónica (Física) | |
| dc.subject.unesco | 2202.03 Electricidad | |
| dc.title | Dielectric response to the low-temperature magnetic defect structure and spin state transition in polycrystalline LaCoO_(3) | |
| dc.type | journal article | |
| dc.volume.number | 79 | |
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| dspace.entity.type | Publication | |
| relation.isAuthorOfPublication | 4d468566-fa66-4e1c-8463-382517edca6e | |
| relation.isAuthorOfPublication.latestForDiscovery | 4d468566-fa66-4e1c-8463-382517edca6e |
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