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Title: Theory of unconventional superconductivity in the 1/4-filled band correlated-electron super-conductors [and previous titles]. Final Report, DOE-BES grant DE-FG02-06ER46315

Abstract

Determination of the mechanism of correlated-electron superconductivity (SC) has turned out to be the hardest problem in condensed matter physics. After nearly three decades of intense investigation of the high-T c cuprates it now appears that one key idea, viz., - weak doping of Mott-Hubbard semiconductors leads to SC -may not be correct, or is at least incomplete. This conclusion is arrived from recent experiments that have clearly indicated that the pseudogap state in the cuprates, separated by a thermodynamic phase transition from the undoped antiferromagnet, is significantly more complicated than thought before. Buried inside it there is a distinct charge-ordered (CO) state. Understanding the complete set of competing and coexisting phases in the pseudogap state is thus a formidable challenge. It follows that research on other correlated superconductors, which have also been known for a long time, may be able to give much needed fresh insight. It is with this motivation in this project we pursued theoretical research to understand the unconventional SC that is found in an apparently completely separate family of materials, the organic charge-transfer solids (CTS). A unique feature of the CTS is that SC there universally occurs at the carrier concentration $$\rho$$ of 0.5 permore » organic molecule, rather than under carrier doping as in the cuprates. Our work in this project focused on the correlated physics of the organic CTS as well as other inorganic materials with the same carrier density, $$\rho$$=0.5. This project resulted in several theoretical advances in understanding these materials.« less

Authors:
 [1];  [2]
  1. Mississippi State Univ., Mississippi State, MS (United States)
  2. Univ. of Arizona, Tucson, AZ (United States)
Publication Date:
Research Org.:
Mississippi State Univ., Mississippi State, MS (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1406919
Report Number(s):
DOE-MSU-46315
FG02-06ER46315
DOE Contract Number:  
FG02-06ER46315
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; superconductivity; Hubbard model; organic superconductors

Citation Formats

Clay, Rudolf Torsten, and Mazumdar, Sumit. Theory of unconventional superconductivity in the 1/4-filled band correlated-electron super-conductors [and previous titles]. Final Report, DOE-BES grant DE-FG02-06ER46315. United States: N. p., 2017. Web. doi:10.2172/1406919.
Clay, Rudolf Torsten, & Mazumdar, Sumit. Theory of unconventional superconductivity in the 1/4-filled band correlated-electron super-conductors [and previous titles]. Final Report, DOE-BES grant DE-FG02-06ER46315. United States. https://doi.org/10.2172/1406919
Clay, Rudolf Torsten, and Mazumdar, Sumit. Fri . "Theory of unconventional superconductivity in the 1/4-filled band correlated-electron super-conductors [and previous titles]. Final Report, DOE-BES grant DE-FG02-06ER46315". United States. https://doi.org/10.2172/1406919. https://www.osti.gov/servlets/purl/1406919.
@article{osti_1406919,
title = {Theory of unconventional superconductivity in the 1/4-filled band correlated-electron super-conductors [and previous titles]. Final Report, DOE-BES grant DE-FG02-06ER46315},
author = {Clay, Rudolf Torsten and Mazumdar, Sumit},
abstractNote = {Determination of the mechanism of correlated-electron superconductivity (SC) has turned out to be the hardest problem in condensed matter physics. After nearly three decades of intense investigation of the high-Tc cuprates it now appears that one key idea, viz., - weak doping of Mott-Hubbard semiconductors leads to SC -may not be correct, or is at least incomplete. This conclusion is arrived from recent experiments that have clearly indicated that the pseudogap state in the cuprates, separated by a thermodynamic phase transition from the undoped antiferromagnet, is significantly more complicated than thought before. Buried inside it there is a distinct charge-ordered (CO) state. Understanding the complete set of competing and coexisting phases in the pseudogap state is thus a formidable challenge. It follows that research on other correlated superconductors, which have also been known for a long time, may be able to give much needed fresh insight. It is with this motivation in this project we pursued theoretical research to understand the unconventional SC that is found in an apparently completely separate family of materials, the organic charge-transfer solids (CTS). A unique feature of the CTS is that SC there universally occurs at the carrier concentration $\rho$ of 0.5 per organic molecule, rather than under carrier doping as in the cuprates. Our work in this project focused on the correlated physics of the organic CTS as well as other inorganic materials with the same carrier density, $\rho$=0.5. This project resulted in several theoretical advances in understanding these materials.},
doi = {10.2172/1406919},
url = {https://www.osti.gov/biblio/1406919}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {11}
}

Works referenced in this record:

Bond patterns and charge-order amplitude in quarter-filled charge-transfer solids
journal, March 2017


Coulomb enhancement of superconducting pair-pair correlations in a 3 4 -filled model for κ ( BEDT-TTF ) 2 X
journal, May 2016


Coulomb-enhanced superconducting pair correlations and paired-electron liquid in the frustrated quarter-filled band
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Comment on “Tuning the Magnetic Dimensionality by Charge Ordering in the Molecular TMTTF Salts”
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Theory of metal-intercalated phenacenes: Why molecular valence 3 is special
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The chemical physics of unconventional superconductivity
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Monte Carlo simulations of two-dimensional fermion systems with string-bond states
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Absence of superconductivity and valence bond order in the Hubbard–Heisenberg model for organic charge-transfer solids
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Similarities in electronic properties of organic charge-transfer solids and layered cobaltates
journal, June 2012


Beyond the quantum spin liquid concept in frustrated two dimensional organic superconductors
journal, March 2012


Ground State and Finite Temperature Behavior of 1/4-Filled Band Zigzag Ladders
journal, July 2012


Absence of long-range superconducting correlations in the frustrated half-filled-band Hubbard model
journal, April 2012


Theory of Carrier Concentration-Dependent Electronic Behavior in Layered Cobaltates
journal, May 2011


Paired electron crystal: Order from frustration in the quarter-filled band
journal, June 2011


The paired-electron crystal in the two-dimensional frustrated quarter-filled band
journal, June 2010


Bipolaron density-wave driven by antiferromagnetic correlations and frustration in organic superconductors
journal, June 2010


Local singlets, frustration, and unconventional superconductivity in the organic charge-transfer solids
journal, March 2009


From valence bond solid to unconventional superconductivity in the organic charge-transfer solids
journal, November 2009


Absence of Superconductivity in the Half-Filled Band Hubbard Model on the Anisotropic Triangular Lattice
journal, October 2008