Density of states and isotope effect in BiO superconductors: Evidence for nonphonon mechanism

B. Batlogg; R. J. Cava; L. W. Rupp; A. M. Mujsce; J. J. Krajewski; J. P. Remeika; W. F. Peck; A. S. Cooper; G. P. Espinosa

doi:10.1103/PhysRevLett.61.1670

Density of states and isotope effect in BiO superconductors: Evidence for nonphonon mechanism

B. Batlogg, R. J. Cava, L. W. Rupp, A. M. Mujsce, J. J. Krajewski, J. P. Remeika, W. F. Peck, A. S. Cooper, G. P. Espinosa

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Abstract

We report measurements of the physical properties of the 30-K superconductor Ba0.6K0.4BiO3, including upper and lower critical fields and normal-state susceptibility. From the results and from comparison with BaPb0.75Bi0.25O3 and band-structure calculations it is concluded that the BiO superconductors are in the weak-coupling limit, implying that the anomalously high Tc's are not due to conventional, strong electron-phonon coupling. A sizable oxygen isotope effect of very similar magnitude is found for both compounds (=0.2-0.25). We speculate that "phononic" effects in these materials are actually only indicative of dressed electronic excitations mediating superconducting pairing.

Original language	English (US)
Pages (from-to)	1670-1673
Number of pages	4
Journal	Physical review letters
Volume	61
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevLett.61.1670
State	Published - 1988
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.61.1670

Cite this

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title = "Density of states and isotope effect in BiO superconductors: Evidence for nonphonon mechanism",

abstract = "We report measurements of the physical properties of the 30-K superconductor Ba0.6K0.4BiO3, including upper and lower critical fields and normal-state susceptibility. From the results and from comparison with BaPb0.75Bi0.25O3 and band-structure calculations it is concluded that the BiO superconductors are in the weak-coupling limit, implying that the anomalously high Tc's are not due to conventional, strong electron-phonon coupling. A sizable oxygen isotope effect of very similar magnitude is found for both compounds (=0.2-0.25). We speculate that {"}phononic{"} effects in these materials are actually only indicative of dressed electronic excitations mediating superconducting pairing.",

author = "B. Batlogg and Cava, \{R. J.\} and Rupp, \{L. W.\} and Mujsce, \{A. M.\} and Krajewski, \{J. J.\} and Remeika, \{J. P.\} and Peck, \{W. F.\} and Cooper, \{A. S.\} and Espinosa, \{G. P.\}",

year = "1988",

doi = "10.1103/PhysRevLett.61.1670",

language = "English (US)",

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TY - JOUR

T1 - Density of states and isotope effect in BiO superconductors

T2 - Evidence for nonphonon mechanism

AU - Batlogg, B.

AU - Cava, R. J.

AU - Rupp, L. W.

AU - Mujsce, A. M.

AU - Krajewski, J. J.

AU - Remeika, J. P.

AU - Peck, W. F.

AU - Cooper, A. S.

AU - Espinosa, G. P.

PY - 1988

Y1 - 1988

N2 - We report measurements of the physical properties of the 30-K superconductor Ba0.6K0.4BiO3, including upper and lower critical fields and normal-state susceptibility. From the results and from comparison with BaPb0.75Bi0.25O3 and band-structure calculations it is concluded that the BiO superconductors are in the weak-coupling limit, implying that the anomalously high Tc's are not due to conventional, strong electron-phonon coupling. A sizable oxygen isotope effect of very similar magnitude is found for both compounds (=0.2-0.25). We speculate that "phononic" effects in these materials are actually only indicative of dressed electronic excitations mediating superconducting pairing.

AB - We report measurements of the physical properties of the 30-K superconductor Ba0.6K0.4BiO3, including upper and lower critical fields and normal-state susceptibility. From the results and from comparison with BaPb0.75Bi0.25O3 and band-structure calculations it is concluded that the BiO superconductors are in the weak-coupling limit, implying that the anomalously high Tc's are not due to conventional, strong electron-phonon coupling. A sizable oxygen isotope effect of very similar magnitude is found for both compounds (=0.2-0.25). We speculate that "phononic" effects in these materials are actually only indicative of dressed electronic excitations mediating superconducting pairing.

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JO - Physical review letters

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ER -

Density of states and isotope effect in BiO superconductors: Evidence for nonphonon mechanism

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