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Establishment of strongly overdoped states in the HgBa2Ca2Cu3O8+δ superconductor

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Fujinami, K.
dc.contributor.author Ito, T.
dc.contributor.author Suematsu, H.
dc.contributor.author Matsuura, K.
dc.contributor.author Karppinen, M.
dc.contributor.author Yamauchi, H.
dc.date.accessioned 2018-05-22T14:49:06Z
dc.date.available 2018-05-22T14:49:06Z
dc.date.issued 1997-12-01
dc.identifier.citation Fujinami , K , Ito , T , Suematsu , H , Matsuura , K , Karppinen , M & Yamauchi , H 1997 , ' Establishment of strongly overdoped states in the HgBa 2 Ca 2 Cu 3 O 8+δ superconductor ' , Physical Review B , vol. 56 , no. 22 , pp. 14790-14796 . https://doi.org/10.1103/PhysRevB.56.14790 en
dc.identifier.issn 0163-1829
dc.identifier.issn 1550-235X
dc.identifier.other PURE UUID: d19618e2-793f-44ba-9ddf-135a66db9b7b
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/d19618e2-793f-44ba-9ddf-135a66db9b7b
dc.identifier.other PURE LINK: http://www.scopus.com/inward/record.url?scp=0000364511&partnerID=8YFLogxK
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/14777372/PhysRevB.56.14790.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/31184
dc.description.abstract Strongly overdoped HgBa2Ca2Cu3O8+δ (Hg-1223) samples with superconducting transitions as low as 97 K were successfully obtained by using HgO, Ca2CuO3, CuO, and mixtures of highly oxidized BaCuO2+∈ (∈ ≈0.13) and/or BaO2 powders as starting materials for the high-pressure synthesis at 5 CPa and 950°C. The overdoped state was confirmed by observing negative values for the Seebeck coefficient throughout the temperature range from Tc to 320 K in a thermoelectric power measurement. Also, both of the cell parameters a and c were found to decrease with decreasing Tc, reflecting, respectively, an increase in hole concentration in the CuO2 planes and the incorporation of oxygen into the HgOδ layer. The oxygen excess δ as determined by the Cu(+I)/Cu(+II) coulometric titration method, was ∼0.19 in the overdoped sample with Tc=107 K. Subsequent reducing annealing in an Ar atmosphere at 280°C increased the Tc to 131 K. Consistently, only positive Seebeck coefficient values were observed up to 320 K for the Ar-annealed sample. A clearly underdoped material with Tc=118 K was obtained by annealing the same sample in Ar at a higher temperature (∼400°C). Finally, high-pressure synthesis starting from less-oxidized BaCuO2+∈ (∈≈0.06) yielded a Hg-1223 material with δ≈0.10 and Tc= 132 K. en
dc.format.extent 7
dc.format.extent 14790-14796
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries PHYSICAL REVIEW B en
dc.relation.ispartofseries Volume 56, issue 22 en
dc.rights openAccess en
dc.title Establishment of strongly overdoped states in the HgBa2Ca2Cu3O8+δ superconductor en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Tokyo Institute of Technology
dc.contributor.department Hokkaido Electric Power Co.
dc.contributor.department Department of Chemistry
dc.identifier.urn URN:NBN:fi:aalto-201805222624
dc.identifier.doi 10.1103/PhysRevB.56.14790
dc.type.version publishedVersion

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