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Title: Correlation between superconducting gap and pseudogap in high-{Tc} cuprates

Abstract

The authors studied the low-temperature energy gap 2{Delta}{sub o} on Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8}+{delta} (Bi2212) and La{sub 2{minus}x}Sr{sub x}CuO{sub 4} (La214) systematically over a wide range of doping level p using STS, break junction tunneling spectroscopy, Raman scattering and low-T electronic specific heat data. They have also studied the electronic specific heat of La214 in the normal state at T {gt} {Tc}, and confirmed that pseudogap behavior appears at around T*, below which the in-plane resistivity {rho} and magnetic susceptibility {chi} tend to be slightly suppressed. Similar suppression appears in {rho} and {chi} of Bi2212 below the onset temperature of pseudogap T*. It is pointed out in the present study that 2{Delta}{sub o} is closely related to T* in both Bi2212 and La214 systems; T* {approximately} 2{Delta}{sub o}/4.3 k{sub B}. It is also pointed out that 2{Delta}{sub o} is in almost linear proportion to k{sub B}T{sub max}({much{underscore}lt}T*), where T{sub max} is the temperature exhibiting a broad peak in {chi}-T curves and k{sub B}T{sub max} can be considered to give a measure of the effective antiferromagnetic exchange energy J{sub eff}. The {alpha} factors in 2{Delta}{sub o} {approximately} {alpha}k{sub B}T{sub max} {approximately} {alpha}J{sub eff} are {approximately} 1 for La214 and {approximately}more » 2 for Bi2212, respectively. They also report that in both Bi2212 and La214 systems {Tc} roughly scales with p{Delta}{sub o} except in highly doped samples, where {Tc} {proportional{underscore}to} 2{Delta}{sub o}.« less

Authors:
; ;
Publication Date:
Research Org.:
Hokkaido Univ., Sapporo (JP)
OSTI Identifier:
20012812
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Low Temperature Physics; Journal Volume: 117; Journal Issue: 3-4; Conference: International Conference on Physics and Chemistry of Molecular and Oxide Superconductors, MOS'99, Stockholm (SE), 07/28/1999--08/02/1999; Other Information: PBD: Nov 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ENERGY GAP; SUPERCONDUCTIVITY; HIGH-TC SUPERCONDUCTORS; COPPER OXIDES; BISMUTH OXIDES; STRONTIUM OXIDES; CALCIUM OXIDES; LANTHANUM OXIDES; SPECIFIC HEAT; MAGNETIC SUSCEPTIBILITY; CORRELATIONS

Citation Formats

Ido, M., Momono, N., and Oda, M.. Correlation between superconducting gap and pseudogap in high-{Tc} cuprates. United States: N. p., 1999. Web. doi:10.1023/A:1022509430952.
Ido, M., Momono, N., & Oda, M.. Correlation between superconducting gap and pseudogap in high-{Tc} cuprates. United States. doi:10.1023/A:1022509430952.
Ido, M., Momono, N., and Oda, M.. Mon . "Correlation between superconducting gap and pseudogap in high-{Tc} cuprates". United States. doi:10.1023/A:1022509430952.
@article{osti_20012812,
title = {Correlation between superconducting gap and pseudogap in high-{Tc} cuprates},
author = {Ido, M. and Momono, N. and Oda, M.},
abstractNote = {The authors studied the low-temperature energy gap 2{Delta}{sub o} on Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8}+{delta} (Bi2212) and La{sub 2{minus}x}Sr{sub x}CuO{sub 4} (La214) systematically over a wide range of doping level p using STS, break junction tunneling spectroscopy, Raman scattering and low-T electronic specific heat data. They have also studied the electronic specific heat of La214 in the normal state at T {gt} {Tc}, and confirmed that pseudogap behavior appears at around T*, below which the in-plane resistivity {rho} and magnetic susceptibility {chi} tend to be slightly suppressed. Similar suppression appears in {rho} and {chi} of Bi2212 below the onset temperature of pseudogap T*. It is pointed out in the present study that 2{Delta}{sub o} is closely related to T* in both Bi2212 and La214 systems; T* {approximately} 2{Delta}{sub o}/4.3 k{sub B}. It is also pointed out that 2{Delta}{sub o} is in almost linear proportion to k{sub B}T{sub max}({much{underscore}lt}T*), where T{sub max} is the temperature exhibiting a broad peak in {chi}-T curves and k{sub B}T{sub max} can be considered to give a measure of the effective antiferromagnetic exchange energy J{sub eff}. The {alpha} factors in 2{Delta}{sub o} {approximately} {alpha}k{sub B}T{sub max} {approximately} {alpha}J{sub eff} are {approximately} 1 for La214 and {approximately} 2 for Bi2212, respectively. They also report that in both Bi2212 and La214 systems {Tc} roughly scales with p{Delta}{sub o} except in highly doped samples, where {Tc} {proportional{underscore}to} 2{Delta}{sub o}.},
doi = {10.1023/A:1022509430952},
journal = {Journal of Low Temperature Physics},
number = 3-4,
volume = 117,
place = {United States},
year = {Mon Nov 01 00:00:00 EST 1999},
month = {Mon Nov 01 00:00:00 EST 1999}
}