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1Chemistry and structural modulations in Bi sub 2 Sr sub 2 CuO sub 6

Yunxiu Shen,David A Richards,D G Hinks,A W Mitchell

1992Journal of Materials Research（1992）引用：24

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2Structure and chemistry of Ba sub 0. 6 K sub 0. 4 BiO sub y at high temperature

Shiyou Pei,David A Richards,B Dabrowski,J D Jorgensen,D G Hinks,Ying Zheng,A W Mitchell

1991Journal of Solid State Chemistry引用：23

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3Determination of the local structure in Ba sub 1 minus x K sub x BiO sub 3 by x-ray-absorption spectroscopy

S Salemsugui,E E Alp,S M Mini, Murali Ramanathan,Juan Carlos Campuzano,Guy Jennings,M Faiz,Shiyou Pei,B Dabrowski,Yuan F Zheng,David A R Richards,D G Hinks

1991Physical Review B引用：23

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4Structure and Transport Properties of Melt Processed Ba 1-X K X BiO 3

Shiyou Pei, Ying Zheng,D.G. Hinks, P. G. Radaelli,David Richards,A.W. Mitchell,B. Dąbrowski

Single-phase samples of Ba{sub 1-x}K{sub x}BiO{sub 3}(00.35 with {Tc} gradually decreasing as x increases. At 10K, with decreasing potassium content, the symmetry reduces to tetragonal at x=0.35, orthorhombic at x=0.2 and finally to monoclinic at x=0.1. Normal state resistivity displays metallic behavior for 0.40

引用：23

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5Erratum: Irreversibility in Ba 0.625 K 0.375 BiO 3 [Phys. Rev. B 43, 3684 (1991)]

Donglu Shi,X. S. Ling,Ming Xu,M. M. Fang,Sheng Luo,J. I. Budnick,Bogdan Dabrowski,D. G. Hinks,D.R. Richards,Y. Zheng

1991Physical Review B

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6Irreversibility in Ba sub 0. 625 K sub 0. 375 BiO sub 3

Donglu Shi,Xinsheng Sean Ling,Mingcan Xu,Ming Fang,Sheng Luo,J I Budnick,B Dabrowski,D G Hinks,David A R Richards,Yuan F Zheng

An irreversibility line has been identified in bulk Ba{sub 0.625}K{sub 0.375}BiO{sub 3}, which follows the relation 1{minus}{ital T}/{ital T}{sub {ital c}}{similar to}{ital H}{sup 2/3}. According to the flux-creep model, the magnetic irreversibility is caused by thermally activated flux creep and is closely connected with the field-induced resistive broadening. However, previous resistivity measurements showed that the Ba{sub 0.625}K{sub 0.375}BiO{sub 3} system did not exhibit resistive transition broadening. Thus, an alternative explanation based on the Josephson-coupling model is suggested to interpret the irreversibility observed in Ba{sub 0.625}K{sub 0.375}BiO{sub 3}.

1991Physical Review B

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7Phase Instability at the Maximum Tc in Oxide Superconductors: Phase Separation in La Sub 2 CuO Sub 4+x , Nd Sub 2 Minus X Ce Sub X CuO Sub 4 , and La Sub 2 Minus X Sr Sub X CuO Sub 4

J. D. Jorgensen,Philip Lightfoot,Shiyou Pei,David Richards,D. G. Hinks,B. Da̧browski

Observation of similar behavior in three different superconducting oxides suggests that the maximum {Tc} is limited by phase instability. These conclusions are based on previously published neutron powder diffraction data for La{sub 2}CuO{sub 4+x} and Nd{sub 2-x}Ce{sub x}CuO{sub 4} and new data for La{sub 2-x}Sr{sub x}CuO{sub 4} which show a phase separated region for compositions adjacent to that which produces the highest {Tc}. 13 refs., 7 figs.

1990引用：23

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8Structure of BaBiO[sub 3[minus][delta]] at high temperature

Shiyou Pei,J D Jorgensen,D G Hinks,Philip Lightfoot, Yungui Zheng,David A Richards,B Dabrowski,A W Mitchell

1990Materials Research Bulletin（1990）引用：23

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9Structural phase diagram of the Ba sub 1 minus x K sub x BiO sub 3 system

Shiyou Pei,J D Jorgensen,B Dabrowski,D G Hinks,David A R Richards,A W Mitchell,J M Newsam,Saion Sinha,D Vaknin,Allan J Jacobson

1990Physical Review B（1990）引用：25

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10Structural properties of superconducting and nonsuperconducting Ba sub 1-x K sub x BiO3

B Dabrowsi,D G Hinks,J D Jorgensen,David A R Richards,Shiyou Pei,Yuan F Zheng,A W Mitchell

1989引用：23

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11Tunneling Spectroscopy and the Electron-Phonon Interaction in Ba Sub 1-X K Sub X BiO Sub 3

J. F. Zasadzinski,N. Tralshawala, J. Timpf,D. G. Hinks,B. Da̧browski,A.W. Mitchell,David Richards

Tunneling spectroscopy measurements have been performed on bulk samples of Ba{sub 1-x}K{sub x}BiO{sub 3} for the compositions, x=0.375, 0.4 and 0.5, using the natural, surface oxide as the tunnel barrier. The data show structures which are characteristic of phonon effects as seen in conventional superconductors and suggest that {alpha}{sup 2}F({omega}) is strongest for the high frequency optical modes. These results are consistent with other experiments and with recent microscopic calculations which indicate that phonon-mediated pairing is responsible for the superconductivity in this compound. 21 refs., 6 figs., 1 tab.

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12Effect of Ce doping on the Cu charge in the electron superconductor Ndâminus//ital x//Ce/sub /ital x//CuOâ

Esen E Alp,S M Mini,Mohan Ramanathan,B Dabrowski,David A R Richards,D G Hinks

1989引用：23

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13Photoemission and inverse-photoemission studies of Ba sub 1 minus x K sub x BiO sub 3 minus y

T J Wagener,Harry M Meyer,D M Hill,Y J Hu,Michael Jost,J H Weaver,D G Hinks,B Dabrowski,David A R Richards

1989Physical Review B（1989）引用：23

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14Evidence For Phonon-Mediated Coupling In Superconducting Ba1-Xkxbio3

D.G. Hinks,B. Dabrowski,David A R Richards,J.D. Jorgensen,Shiyou Pei,J.F. Zasadzinski

Superconducting Ba 1−x K x BiO 3 , with a T c of 30K, shows a large 18 O isotope effect which indicates that phonons are involved in the pairing mechanism. Superconducting energy gap measurements from IR reflectivity and tunneling are consistent with moderate coupling (2Δ/kT c = 3.5 ± 0.5). A characteristic phonon energy of about 40 meV would be required to obtain the high T c . Neuron scattering measurements show a large density of phonons in the range 40 to 80 meV and strong coupling of electrons to these modes is indicated in tunneling spectroscopy. Additional results are reported, including the structural phase diagram, which suggest that superconductivity is phonon mediated.

1989PHYSICA C（1989）引用：31

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