Oxygen isotope effect in high temperature superconductors - phonons or magnons?

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dc.contributor.authorBarber, FJen_AU
dc.contributor.authorTallon, JLen_AU
dc.contributor.authorMallett, BPPen_AU
dc.contributor.authorAvdeev, Men_AU
dc.date.accessioned2021-10-08T04:38:20Zen_AU
dc.date.available2021-10-08T04:38:20Zen_AU
dc.date.issued2012-11-07en_AU
dc.date.statistics2021-09-27en_AU
dc.descriptionNot available online. Conference Handbook is held by ANSTO Library at DDC 539.758/9.en_AU
dc.description.abstractThe oxygen isotope effect displayed in the critical temperature, Tϲ, by high temperature superconducting (HTS) cuprates was studied using polycrystalline samples of YBa2Cu3O6. The dominant perspective within the community is that this isotope effect is resultant from lattice vibrations or 'phonons'. In contrast, our treatment assesses the viability of explaining this effect by an indirectly acting magnetic mechanism. This proposed mechanism involves an increase in the anti- ferromagnetic super-exchange interaction energy, J, between adjacent Cu(2) ions as a result of decreasing unit cell basal area from a decrease in lattice vibration magnitudes. Polycrystalline YBa2Cu3O6 samples of similar mass were synthesised under identical conditions, then co-annealed under 16O and 18O gas respectively. Neutron diffraction experiments were performed on these samples at 3K, 50K and 100K to accurately determine structural parameters. Rietveld refinement produced inferred critical temperature isotope exponents, α = of α-(3K)=(3.6±0.4)x103, α(50K)=(4.3±0.6)x103, and α (100K)=(7.2±0.9)x103. Comparison with the experimentally measured isotope effect of α=0.06 in the overdoped region indicates that our mechanism is unlikely to be sufficient to account for the isotope effect in Tϲ. We note, however, that there remains a possibility of a secondary contribution from this mechanism. This project plans for further back-exchange and repeated diffraction measurements, which will aid in confirming and comparing these results.en_AU
dc.identifier.citationBarber, F. J., Tallon, J. L., Mallett, B. P. P., & Avdeev, M. (2012). Oxygen isotope effect in high temperature superconductors - phonons or magnons? Paper presented at the 10th AINSE-ANBUG Neutron Scattering Symposium (AANSS), Sydney, 7- 9 November 2012, (pp.25)en_AU
dc.identifier.conferenceenddate9 November 2012en_AU
dc.identifier.conferencename10th AINSE-ANBUG Neutron Scattering Symposium (AANSS)en_AU
dc.identifier.conferenceplaceSydney, Australiaen_AU
dc.identifier.conferencestartdate7 November 2012en_AU
dc.identifier.pagination25en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11904en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Nuclear Science and Engineering (AINSE)en_AU
dc.subjectIsotope effectsen_AU
dc.subjectSuperconductorsen_AU
dc.subjectIonsen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectOxygen isotopesen_AU
dc.subjectPhononsen_AU
dc.subjectPolycrystalsen_AU
dc.subjectMagnetismen_AU
dc.titleOxygen isotope effect in high temperature superconductors - phonons or magnons?en_AU
dc.typeConference Presentationen_AU
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