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Title: Organic superconductivity studied by using positron annihilation and compton profile spectroscopies. Final technical report, 1 November 1992-31 August 1996

Abstract

Organic superconductivity was studied by positron annihilation spectroscopy, positron annihilation lifetime (PAL), and two-dimensional angular correlation of annihilation radiation (2D-ACAR). The positron-electron momentum densities of ET-based organic superconductors were measured at room temperature using the 2D-ACAR method. The folded electron densities were found to be in accord with the Fermi surface predicted by a first-principles method using orthogonalized linear combination of atomic orbitals. Positron lifetimes of ET-based organic superconductors were measured as a function of temperature between 1.5K and 300K. A change of electronic density as indicated from the lifetime results was found at the superconducting transition temperature. It was found to be difficult to obtain a good Compton profile at this stage due to the lack of large crystals of organic superconductors. The obtained positron annihilation experimental results, along with theoretical calculations, could be useful in providing clues to search for new organic superconductors in the future.

Authors:
Publication Date:
Research Org.:
Missouri Univ., Kansas City, MO (United States)
OSTI Identifier:
445803
Report Number(s):
AD-A-318363/9/XAB
CNN: Contract F49620-92-J-0521; TRN: 70490436
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Nov 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 66 PHYSICS; ORGANIC SUPERCONDUCTORS; ELECTRON DENSITY; POSITRONS; ANNIHILATION; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0013-0065 K; TEMPERATURE RANGE 0065-0273 K; PROGRESS REPORT

Citation Formats

Jean, Y J. Organic superconductivity studied by using positron annihilation and compton profile spectroscopies. Final technical report, 1 November 1992-31 August 1996. United States: N. p., 1996. Web.
Jean, Y J. Organic superconductivity studied by using positron annihilation and compton profile spectroscopies. Final technical report, 1 November 1992-31 August 1996. United States.
Jean, Y J. 1996. "Organic superconductivity studied by using positron annihilation and compton profile spectroscopies. Final technical report, 1 November 1992-31 August 1996". United States.
@article{osti_445803,
title = {Organic superconductivity studied by using positron annihilation and compton profile spectroscopies. Final technical report, 1 November 1992-31 August 1996},
author = {Jean, Y J},
abstractNote = {Organic superconductivity was studied by positron annihilation spectroscopy, positron annihilation lifetime (PAL), and two-dimensional angular correlation of annihilation radiation (2D-ACAR). The positron-electron momentum densities of ET-based organic superconductors were measured at room temperature using the 2D-ACAR method. The folded electron densities were found to be in accord with the Fermi surface predicted by a first-principles method using orthogonalized linear combination of atomic orbitals. Positron lifetimes of ET-based organic superconductors were measured as a function of temperature between 1.5K and 300K. A change of electronic density as indicated from the lifetime results was found at the superconducting transition temperature. It was found to be difficult to obtain a good Compton profile at this stage due to the lack of large crystals of organic superconductors. The obtained positron annihilation experimental results, along with theoretical calculations, could be useful in providing clues to search for new organic superconductors in the future.},
doi = {},
url = {https://www.osti.gov/biblio/445803}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Nov 01 00:00:00 EST 1996},
month = {Fri Nov 01 00:00:00 EST 1996}
}

Technical Report:
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