Effects of lead doping on Tc and energy gap of Bi2Sr2CaCu2O8 by tunneling spectroscopy

Jeffrey Kane; K. W. Ng; D. Moecher

doi:10.1016/S0921-4534(97)01696-1

Effects of lead doping on T_c and energy gap of Bi₂Sr₂CaCu₂O₈ by tunneling spectroscopy

Jeffrey Kane, K. W. Ng, D. Moecher

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

Doping the high-T_c superconductor Bi₂Sr₂CaCu₂O₈ (Bi-2212) with lead causes a partial substitution of the Bi atoms between the conducting CuO₂ planes, and modifies some of the electronic and structural properties of the material. We have studied Pb-doped Bi-2212 single crystals using a tunneling technique. We find that while Pb doping decreases T_c significantly, it has a minimal effect on the in-plane energy gap, leading to an increase in the reduced gap, 2Δ/kT_c. This result is consistent with other studies of the effects of in-plane dopants on Bi-2212, but is the first evidence of such an effect attributable to defects introduced out of the plane. Inspection of the physical evidence leads to the conclusion that the inter-layer coupling has been modified and indicates a connection between high-T_c superconductivity and the inter-layer coupling between the CuO₂ planes.

Original language	English
Pages (from-to)	176-182
Number of pages	7
Journal	Physica C: Superconductivity and its Applications
Volume	294
Issue number	3-4
DOIs	https://doi.org/10.1016/S0921-4534(97)01696-1
State	Published - Jan 1 1998

Bibliographical note

Funding Information:
The authors gratefully acknowledge Professor C.P. Brock, University of Kentucky Department of Chemistry, for guidance on XRD techniques. This work was supported by the National Science Foundation through Grant No. DMR-9623842.

Keywords

Energy gap
Substitution effects
Tunneling spectroscopy

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1016/S0921-4534(97)01696-1

Cite this

@article{ce00f202fcdf41a0a9058d0dd3a62a39,

title = "Effects of lead doping on Tc and energy gap of Bi2Sr2CaCu2O8 by tunneling spectroscopy",

abstract = "Doping the high-Tc superconductor Bi2Sr2CaCu2O8 (Bi-2212) with lead causes a partial substitution of the Bi atoms between the conducting CuO2 planes, and modifies some of the electronic and structural properties of the material. We have studied Pb-doped Bi-2212 single crystals using a tunneling technique. We find that while Pb doping decreases Tc significantly, it has a minimal effect on the in-plane energy gap, leading to an increase in the reduced gap, 2Δ/kTc. This result is consistent with other studies of the effects of in-plane dopants on Bi-2212, but is the first evidence of such an effect attributable to defects introduced out of the plane. Inspection of the physical evidence leads to the conclusion that the inter-layer coupling has been modified and indicates a connection between high-Tc superconductivity and the inter-layer coupling between the CuO2 planes.",

keywords = "Energy gap, Substitution effects, Tunneling spectroscopy",

author = "Jeffrey Kane and Ng, {K. W.} and D. Moecher",

note = "Funding Information: The authors gratefully acknowledge Professor C.P. Brock, University of Kentucky Department of Chemistry, for guidance on XRD techniques. This work was supported by the National Science Foundation through Grant No. DMR-9623842.",

year = "1998",

month = jan,

day = "1",

doi = "10.1016/S0921-4534(97)01696-1",

language = "English",

volume = "294",

pages = "176--182",

number = "3-4",

}

TY - JOUR

T1 - Effects of lead doping on Tc and energy gap of Bi2Sr2CaCu2O8 by tunneling spectroscopy

AU - Kane, Jeffrey

AU - Ng, K. W.

AU - Moecher, D.

N1 - Funding Information: The authors gratefully acknowledge Professor C.P. Brock, University of Kentucky Department of Chemistry, for guidance on XRD techniques. This work was supported by the National Science Foundation through Grant No. DMR-9623842.

PY - 1998/1/1

Y1 - 1998/1/1

N2 - Doping the high-Tc superconductor Bi2Sr2CaCu2O8 (Bi-2212) with lead causes a partial substitution of the Bi atoms between the conducting CuO2 planes, and modifies some of the electronic and structural properties of the material. We have studied Pb-doped Bi-2212 single crystals using a tunneling technique. We find that while Pb doping decreases Tc significantly, it has a minimal effect on the in-plane energy gap, leading to an increase in the reduced gap, 2Δ/kTc. This result is consistent with other studies of the effects of in-plane dopants on Bi-2212, but is the first evidence of such an effect attributable to defects introduced out of the plane. Inspection of the physical evidence leads to the conclusion that the inter-layer coupling has been modified and indicates a connection between high-Tc superconductivity and the inter-layer coupling between the CuO2 planes.

AB - Doping the high-Tc superconductor Bi2Sr2CaCu2O8 (Bi-2212) with lead causes a partial substitution of the Bi atoms between the conducting CuO2 planes, and modifies some of the electronic and structural properties of the material. We have studied Pb-doped Bi-2212 single crystals using a tunneling technique. We find that while Pb doping decreases Tc significantly, it has a minimal effect on the in-plane energy gap, leading to an increase in the reduced gap, 2Δ/kTc. This result is consistent with other studies of the effects of in-plane dopants on Bi-2212, but is the first evidence of such an effect attributable to defects introduced out of the plane. Inspection of the physical evidence leads to the conclusion that the inter-layer coupling has been modified and indicates a connection between high-Tc superconductivity and the inter-layer coupling between the CuO2 planes.

KW - Energy gap

KW - Substitution effects

KW - Tunneling spectroscopy

UR - http://www.scopus.com/inward/record.url?scp=0031699321&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031699321&partnerID=8YFLogxK

U2 - 10.1016/S0921-4534(97)01696-1

DO - 10.1016/S0921-4534(97)01696-1

M3 - Article

AN - SCOPUS:0031699321

SN - 0921-4534

VL - 294

SP - 176

EP - 182

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - 3-4

ER -