Enhancement of metallic behavior in bismuth cobaltates through lead doping

S. M. Loureiro, D. P. Young, R. J. Cava, R. Jin, Y. Liu, P. Bordet, Y. Qin, H. Zandbergen, M. Godinho, M. Núñez-Regueiro, B. Batlogg

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Abstract

Single crystals of Bi2M3Co2Oy phases with M = Ca, Sr, and Ba were synthesized by the flux method. The undoped Ca and Sr analogs are semiconducting while the Ba analog has a metal to semiconductor transition at ≈80 K. Pb-substituted single crystals in which Pb partially substitutes for Bi were prepared by a similar method. Transmission electron microscopy carried out on single crystals of the undoped phases reveals a superstructure similar to that of superconducting bismuth-2212. This superstructure disappears when the Sr and Ba compounds are Pb doped. Transport measurements show that Pb doping induces a clear increase in the metallic character of the samples for Sr and Ba analogs. The metal to semiconductor transition in Bi2Ba3Co2Oy is suppressed by Pb doping, and (Bi, Pb)2Ba3Co2Oy is metallic down to 30 mK. The magnetic-susceptibility data do not show any evidence of ordering, and the magnetic moment Co atom was found to be ≈1μB. Resistivity measurements carried out up to 20 GPa show that the samples become more semiconducting with increasing pressure.

Original languageEnglish (US)
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume63
Issue number9
DOIs
StatePublished - Jan 30 2001

Fingerprint

Bismuth
bismuth
Lead
Doping (additives)
Single crystals
analogs
augmentation
single crystals
Metals
Semiconductor materials
Magnetic moments
Magnetic susceptibility
metals
magnetic moments
substitutes
Fluxes
Transmission electron microscopy
magnetic permeability
Atoms
transmission electron microscopy

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Loureiro, S. M. ; Young, D. P. ; Cava, R. J. ; Jin, R. ; Liu, Y. ; Bordet, P. ; Qin, Y. ; Zandbergen, H. ; Godinho, M. ; Núñez-Regueiro, M. ; Batlogg, B. / Enhancement of metallic behavior in bismuth cobaltates through lead doping. In: Physical Review B - Condensed Matter and Materials Physics. 2001 ; Vol. 63, No. 9.
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Loureiro, SM, Young, DP, Cava, RJ, Jin, R, Liu, Y, Bordet, P, Qin, Y, Zandbergen, H, Godinho, M, Núñez-Regueiro, M & Batlogg, B 2001, 'Enhancement of metallic behavior in bismuth cobaltates through lead doping', Physical Review B - Condensed Matter and Materials Physics, vol. 63, no. 9. https://doi.org/10.1103/PhysRevB.63.094109

Enhancement of metallic behavior in bismuth cobaltates through lead doping. / Loureiro, S. M.; Young, D. P.; Cava, R. J.; Jin, R.; Liu, Y.; Bordet, P.; Qin, Y.; Zandbergen, H.; Godinho, M.; Núñez-Regueiro, M.; Batlogg, B.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 63, No. 9, 30.01.2001.

Research output: Contribution to journalArticle

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AU - Loureiro, S. M.

AU - Young, D. P.

AU - Cava, R. J.

AU - Jin, R.

AU - Liu, Y.

AU - Bordet, P.

AU - Qin, Y.

AU - Zandbergen, H.

AU - Godinho, M.

AU - Núñez-Regueiro, M.

AU - Batlogg, B.

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Y1 - 2001/1/30

N2 - Single crystals of Bi2M3Co2Oy phases with M = Ca, Sr, and Ba were synthesized by the flux method. The undoped Ca and Sr analogs are semiconducting while the Ba analog has a metal to semiconductor transition at ≈80 K. Pb-substituted single crystals in which Pb partially substitutes for Bi were prepared by a similar method. Transmission electron microscopy carried out on single crystals of the undoped phases reveals a superstructure similar to that of superconducting bismuth-2212. This superstructure disappears when the Sr and Ba compounds are Pb doped. Transport measurements show that Pb doping induces a clear increase in the metallic character of the samples for Sr and Ba analogs. The metal to semiconductor transition in Bi2Ba3Co2Oy is suppressed by Pb doping, and (Bi, Pb)2Ba3Co2Oy is metallic down to 30 mK. The magnetic-susceptibility data do not show any evidence of ordering, and the magnetic moment Co atom was found to be ≈1μB. Resistivity measurements carried out up to 20 GPa show that the samples become more semiconducting with increasing pressure.

AB - Single crystals of Bi2M3Co2Oy phases with M = Ca, Sr, and Ba were synthesized by the flux method. The undoped Ca and Sr analogs are semiconducting while the Ba analog has a metal to semiconductor transition at ≈80 K. Pb-substituted single crystals in which Pb partially substitutes for Bi were prepared by a similar method. Transmission electron microscopy carried out on single crystals of the undoped phases reveals a superstructure similar to that of superconducting bismuth-2212. This superstructure disappears when the Sr and Ba compounds are Pb doped. Transport measurements show that Pb doping induces a clear increase in the metallic character of the samples for Sr and Ba analogs. The metal to semiconductor transition in Bi2Ba3Co2Oy is suppressed by Pb doping, and (Bi, Pb)2Ba3Co2Oy is metallic down to 30 mK. The magnetic-susceptibility data do not show any evidence of ordering, and the magnetic moment Co atom was found to be ≈1μB. Resistivity measurements carried out up to 20 GPa show that the samples become more semiconducting with increasing pressure.

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