STRUCTURAL CONVERSION IN HIGH Tc SUPERCONDUCTORS

Huong, Pham V.; Chaminade, Jean‐Pierre; Frison, Julien; Park, Y.K.; Park, J.C.; Kim, K.H.; Park, J.S.

doi:10.1016/b978-0-444-89353-6.50024-5

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…All three spectra are similar to that of its parent compound TlBa 2 CaCu 2 O 7 . [23][24][25] Although the bulk samples contain a trace of impurities, the selected microcrystals examined do not present Raman features corresponding to impurities. Particularly, the Raman modes for the carbonates are expected to appear around 1000 cm -1 .…”

Section: Experiments and Resultsmentioning

confidence: 99%

Charge-Transfer-Induced Insulator−Superconductor Transition in TlBa_2-xSr_xCa_0.4Pr_0.6Cu₂O_7-_δ: A Joint Neutron/X-ray Rietveld Refinement, Infrared Absorption, and Raman Scattering Studies

et al. 1997

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Insulator-superconductor transition in TlBa 2-x Sr x Ca 0.4 Pr 0.6 Cu 2 O 7-δ has been investigated by a joint Rietveld refinement of neutron and X-ray diffraction data, Raman scattering, and infrared absorption studies. For x ) 0, the system is an insulator. Substitution of the Ba 2+ ions by smaller Sr 2+ ions leads to a transition from semiconductor to metal then superconductor for x ) 1.0. Further, the superconducting transition temperature (T c ) increases with x. Results of the joint neutron/X-ray Rietveld refinement revealed that the Tl-O(1) apical bond length does not change appreciably while the Cu-O(1) bond length decreases largely when x increases, consistent with an electron transfer from Cu to Tl. This idea is supported by the Raman scattering measurements showing a large frequency shift of the phonon mode involving the motion of O(1) toward Tl, when Ba is replaced by Sr.

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Section: Experiments and Resultsmentioning

confidence: 99%

Charge-Transfer-Induced Insulator−Superconductor Transition in TlBa_2-xSr_xCa_0.4Pr_0.6Cu₂O_7-_δ: A Joint Neutron/X-ray Rietveld Refinement, Infrared Absorption, and Raman Scattering Studies

et al. 1997

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Anisotropy and Transport Properties in Substituted and Intercalated High Temperature Superconductors Studied by Raman Spectroscopy

Huong¹,

Ndiaye²

1999

Physics and Materials Science of Vortex States, Flux Pinning and Dynamics

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STRUCTURAL CONVERSION IN HIGH Tc SUPERCONDUCTORS

Cited by 2 publications

References 14 publications

Charge-Transfer-Induced Insulator−Superconductor Transition in TlBa_2-xSr_xCa_0.4Pr_0.6Cu₂O_7-_δ: A Joint Neutron/X-ray Rietveld Refinement, Infrared Absorption, and Raman Scattering Studies

Charge-Transfer-Induced Insulator−Superconductor Transition in TlBa_2-xSr_xCa_0.4Pr_0.6Cu₂O_7-_δ: A Joint Neutron/X-ray Rietveld Refinement, Infrared Absorption, and Raman Scattering Studies

Anisotropy and Transport Properties in Substituted and Intercalated High Temperature Superconductors Studied by Raman Spectroscopy

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STRUCTURAL CONVERSION IN HIGH Tc SUPERCONDUCTORS

Cited by 2 publications

References 14 publications

Charge-Transfer-Induced Insulator−Superconductor Transition in TlBa2-xSrxCa0.4Pr0.6Cu2O7-δ: A Joint Neutron/X-ray Rietveld Refinement, Infrared Absorption, and Raman Scattering Studies

Charge-Transfer-Induced Insulator−Superconductor Transition in TlBa2-xSrxCa0.4Pr0.6Cu2O7-δ: A Joint Neutron/X-ray Rietveld Refinement, Infrared Absorption, and Raman Scattering Studies

Anisotropy and Transport Properties in Substituted and Intercalated High Temperature Superconductors Studied by Raman Spectroscopy

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About

Charge-Transfer-Induced Insulator−Superconductor Transition in TlBa_2-xSr_xCa_0.4Pr_0.6Cu₂O_7-_δ: A Joint Neutron/X-ray Rietveld Refinement, Infrared Absorption, and Raman Scattering Studies

Charge-Transfer-Induced Insulator−Superconductor Transition in TlBa_2-xSr_xCa_0.4Pr_0.6Cu₂O_7-_δ: A Joint Neutron/X-ray Rietveld Refinement, Infrared Absorption, and Raman Scattering Studies