Evolution of Magnetic and Superconducting Fluctuations with Doping of High- T c Superconductors-Reference-Cited by-同舟云学术

Evolution of Magnetic and Superconducting Fluctuations with Doping of High- T c Superconductors

Published:1997-11-21 Issue:5342 Volume:278 Page:1427-1432
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Blumberg G.¹²³⁴,Kang Moonsoo¹²³⁴,Klein M. V.¹²³⁴,Kadowaki K.¹²³⁴,Kendziora C.¹²³⁴

Affiliation:

1. G. Blumberg, NSF Science and Technology Center for Superconductivity and Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA, and Institute of Chemical Physics and Biophysics, Tallinn EE0001, Estonia.

2. M. Kang and M. V. Klein, NSF Science and Technology Center for Superconductivity and Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.

3. K. Kadowaki, Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305, Japan.

4. C. Kendziora, Naval Research Laboratory (Code 6653), Washington, DC 20375, USA.

Abstract

Electronic Raman scattering from high- and low-energy excitations was studied as a function of temperature, extent of hole doping, and energy of the incident photons in Bi 2 Sr 2 CaCu 2 O 8±δ superconductors. For underdoped superconductors, short-range antiferromagnetic (AF) correlations were found to persist with hole doping, and doped single holes were found to be incoherent in the AF environment. Above the superconducting (SC) transition temperature T c , the system exhibited a sharp Raman resonance of B 1 g symmetry and energy of 75 millielectron-volts and a pseudogap for electron-hole excitations below 75 millielectron-volts, a manifestation of a partially coherent state forming from doped incoherent quasi particles. The occupancy of the coherent state increases with cooling until phase ordering at T c produces a global SC state.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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