DC Field | Value | Language |
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dc.contributor.author | von Nidda, HAK | - |
dc.contributor.author | Kraus, S | - |
dc.contributor.author | Schaile, S | - |
dc.contributor.author | Dengler, E | - |
dc.contributor.author | Pascher, N | - |
dc.contributor.author | Hemmida, M | - |
dc.contributor.author | Eom, MJ | - |
dc.contributor.author | Kim, JS | - |
dc.contributor.author | Jeevan, HS | - |
dc.contributor.author | Gegenwart, P | - |
dc.contributor.author | Deisenhofer, J | - |
dc.contributor.author | Loidl, A | - |
dc.date.accessioned | 2017-07-19T11:12:42Z | - |
dc.date.available | 2017-07-19T11:12:42Z | - |
dc.date.created | 2013-03-15 | - |
dc.date.issued | 2012-09-10 | - |
dc.identifier.issn | 1098-0121 | - |
dc.identifier.uri | https://oasis.postech.ac.kr/handle/2014.oak/35009 | - |
dc.description.abstract | The phase diagrams of EuFe2-xCoxAs2 (0 <= x <= 0.4) and EuFe2As2-yPy (0 <= y <= 0.43) are investigated by Eu2+ electron spin resonance (ESR) in single crystals. From the temperature dependence of the linewidth Delta H(T) of the exchange narrowed ESR line, the spin-density wave (SDW) (T < T-SDW) and the normal metallic regime (T > T-SDW) are clearly distinguished. AtT > T-SDW the isotropic linear increase of the linewidth is driven by the Korringa relaxation which measures the conduction-electron density of states at the Fermi level. For T < T-SDW the anisotropy probes the local ligand field, while the coupling to the conduction electrons is strongly weakened. With increasing substitution of x or y the transition temperature T-SDW decreases linearly accompanied by a linear decrease of the Korringa-relaxation rate from 8 Oe/K at x = y = 0 down to 3 Oe/K at the onset of superconductivity. Forx > 0.2 andy > 0.3 it remains nearly constant. Comparative ESR measurements on single crystals of the Eu diluted SDWcompound Eu0.2Sr0.8Fe2As2 and superconducting (SC) Eu0.22Sr0.78Fe1.72Co0.28As2 corroborate the leading influence of the ligand field on the Eu2+ spin relaxation in the SDW regime as well as the Korringa relaxation in the normal metallic regime. A coherence peak is not detected in the latter compound below T-c = 21 K, which is in agreement with the expected complex anisotropic SC gap structure. In contrast, indications for phase coexistence and BCS-type superconductivity are found in EuFe2As1.57P0.43. | - |
dc.language | English | - |
dc.publisher | American Physical Society | - |
dc.relation.isPartOf | PHYSICAL REVIEW B | - |
dc.title | Electron spin resonance in Eu-based iron pnictides | - |
dc.type | Article | - |
dc.identifier.doi | 10.1103/PHYSREVB.86.094411 | - |
dc.type.rims | ART | - |
dc.identifier.bibliographicCitation | PHYSICAL REVIEW B, v.86, no.9, pp.94411 | - |
dc.identifier.wosid | 000308527600003 | - |
dc.date.tcdate | 2019-03-01 | - |
dc.citation.number | 9 | - |
dc.citation.startPage | 94411 | - |
dc.citation.title | PHYSICAL REVIEW B | - |
dc.citation.volume | 86 | - |
dc.contributor.affiliatedAuthor | Kim, JS | - |
dc.identifier.scopusid | 2-s2.0-84866081551 | - |
dc.description.journalClass | 1 | - |
dc.description.journalClass | 1 | - |
dc.description.wostc | 8 | - |
dc.description.scptc | 7 | * |
dc.date.scptcdate | 2018-05-121 | * |
dc.type.docType | Article | - |
dc.subject.keywordPlus | PARAMAGNETIC-RESONANCE | - |
dc.subject.keywordPlus | SUPERCONDUCTIVITY | - |
dc.subject.keywordPlus | FIELDS | - |
dc.subject.keywordPlus | GD | - |
dc.relation.journalWebOfScienceCategory | Materials Science, Multidisciplinary | - |
dc.relation.journalWebOfScienceCategory | Physics, Applied | - |
dc.relation.journalWebOfScienceCategory | Physics, Condensed Matter | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Materials Science | - |
dc.relation.journalResearchArea | Physics | - |
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