Application of the mean-field approximation to the magnetic and superconducting phases of quasi-one-dimensional metal

A. V. Rozhkov

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Citations (Scopus)

Abstract

We research under what condition the mean-field approximation can be applied to study ordered phases of quasi-one-dimensional metal. It is shown that the mean-field treatment is indeed permissible provided that it is applied not to the microscopic Hamiltonian (subject to severe one-dimensional high-energy fluctuations), but rather to effective Hamiltonian derived at the dimensional crossover scale. The resultant mean-field phase diagram has three ordered phases: spin density wave, charge density wave, and superconductivity. The density wave orders win if the Fermi surface nests well. Outcome of competition between the intra-chain and inter-chain electron repulsion determines the type (spin vs. charge) of the density wave. The ground state becomes superconducting (with unconventional order parameter) when the nesting is poor. The superconducting mechanism relies crucially on the one-dimensional fluctuations.

Original languageEnglish
Title of host publicationMagnetism and Magnetic Materials
PublisherTrans Tech Publications Ltd
Pages591-594
Number of pages4
ISBN (Print)390845168X, 9783908451686
DOIs
Publication statusPublished - 2009
Externally publishedYes
EventForth Moscow International Symposium on Magnetism MISM2008 - Moscow, Russian Federation
Duration: 20 Jun 200825 Jun 2008

Publication series

NameSolid State Phenomena
Volume152-153
ISSN (Print)1012-0394

Conference

ConferenceForth Moscow International Symposium on Magnetism MISM2008
Country/TerritoryRussian Federation
CityMoscow
Period20/06/0825/06/08

Keywords

  • Mean field
  • Quasi-one-dimensional metal
  • Spin-density wave
  • Superconductivity

Fingerprint

Dive into the research topics of 'Application of the mean-field approximation to the magnetic and superconducting phases of quasi-one-dimensional metal'. Together they form a unique fingerprint.

Cite this