Can magnetic moments due to orbital currents exist in an electron-lattice model of cuprate superconductors?

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2 Citations (Scopus)

Abstract

The recent discovery of unusual magnetic modes in the CuO 2 planes of high-temperature superconducting cuprates HgBa 2CuO 4+δ in the pseudogap phase, if confirmed, suggests the existence of a new phase of condensed matter. The present situation is controversial since recent measurements of the magnetic environment of barium atoms in YBa 2Cu 4O 8 obtained negative results. The theoretical situation is also controversial since several theoretical studies of the same three-band Hubbard model gave conflicting results. However, the important experimental evidence of ubiquitous strong electron-lattice interaction remains to be understood and we investigate the question of whether orbital currents can exist in an electron-lattice model. We show in a simple physical picture that if a predominant mode of vibration of the oxygens is an unusual planar non-linear mode, orbital currents can be generated. Simple order of magnitude estimates of the magnetic fields generated are remarkably in agreement with an experimental measurement.

Original languageEnglish
Pages (from-to)861-865
Number of pages5
JournalJournal of Superconductivity and Novel Magnetism
Volume25
Issue number4
DOIs
Publication statusPublished - May 2012

Fingerprint

Magnetic moments
cuprates
magnetic moments
orbitals
Hubbard model
Electrons
Barium
barium
vibration mode
electrons
Magnetic fields
Oxygen
Atoms
oxygen
estimates
magnetic fields
atoms
interactions
Temperature
Cuprate superconductors

Keywords

  • Cuprate superconductors
  • Non-linear oxygen vibrations
  • Orbital currents
  • Pseudogap
  • Unusual magnetic order

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Can magnetic moments due to orbital currents exist in an electron-lattice model of cuprate superconductors?",
abstract = "The recent discovery of unusual magnetic modes in the CuO 2 planes of high-temperature superconducting cuprates HgBa 2CuO 4+δ in the pseudogap phase, if confirmed, suggests the existence of a new phase of condensed matter. The present situation is controversial since recent measurements of the magnetic environment of barium atoms in YBa 2Cu 4O 8 obtained negative results. The theoretical situation is also controversial since several theoretical studies of the same three-band Hubbard model gave conflicting results. However, the important experimental evidence of ubiquitous strong electron-lattice interaction remains to be understood and we investigate the question of whether orbital currents can exist in an electron-lattice model. We show in a simple physical picture that if a predominant mode of vibration of the oxygens is an unusual planar non-linear mode, orbital currents can be generated. Simple order of magnitude estimates of the magnetic fields generated are remarkably in agreement with an experimental measurement.",
keywords = "Cuprate superconductors, Non-linear oxygen vibrations, Orbital currents, Pseudogap, Unusual magnetic order",
author = "Lee, {B. S.} and {Abd. Shukor}, Roslan",
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T1 - Can magnetic moments due to orbital currents exist in an electron-lattice model of cuprate superconductors?

AU - Lee, B. S.

AU - Abd. Shukor, Roslan

PY - 2012/5

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N2 - The recent discovery of unusual magnetic modes in the CuO 2 planes of high-temperature superconducting cuprates HgBa 2CuO 4+δ in the pseudogap phase, if confirmed, suggests the existence of a new phase of condensed matter. The present situation is controversial since recent measurements of the magnetic environment of barium atoms in YBa 2Cu 4O 8 obtained negative results. The theoretical situation is also controversial since several theoretical studies of the same three-band Hubbard model gave conflicting results. However, the important experimental evidence of ubiquitous strong electron-lattice interaction remains to be understood and we investigate the question of whether orbital currents can exist in an electron-lattice model. We show in a simple physical picture that if a predominant mode of vibration of the oxygens is an unusual planar non-linear mode, orbital currents can be generated. Simple order of magnitude estimates of the magnetic fields generated are remarkably in agreement with an experimental measurement.

AB - The recent discovery of unusual magnetic modes in the CuO 2 planes of high-temperature superconducting cuprates HgBa 2CuO 4+δ in the pseudogap phase, if confirmed, suggests the existence of a new phase of condensed matter. The present situation is controversial since recent measurements of the magnetic environment of barium atoms in YBa 2Cu 4O 8 obtained negative results. The theoretical situation is also controversial since several theoretical studies of the same three-band Hubbard model gave conflicting results. However, the important experimental evidence of ubiquitous strong electron-lattice interaction remains to be understood and we investigate the question of whether orbital currents can exist in an electron-lattice model. We show in a simple physical picture that if a predominant mode of vibration of the oxygens is an unusual planar non-linear mode, orbital currents can be generated. Simple order of magnitude estimates of the magnetic fields generated are remarkably in agreement with an experimental measurement.

KW - Cuprate superconductors

KW - Non-linear oxygen vibrations

KW - Orbital currents

KW - Pseudogap

KW - Unusual magnetic order

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