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Gennady Y. Chitov Laurentian University Sudbury, Ontario, Canada in collaboration with Claudius Gros Frankfurt University Frankfurt, Germany

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The spin-SAF Transition in the Quarter-Filled Ladder Compound NaV2O5 Gennady Y. Chitov Laurentian University Sudbury, Ontario, Canada in collaboration with – PowerPoint PPT presentation

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Title: Gennady Y. Chitov Laurentian University Sudbury, Ontario, Canada in collaboration with Claudius Gros Frankfurt University Frankfurt, Germany


1
Gennady Y. ChitovLaurentian UniversitySudbury,
Ontario, Canadain collaboration withClaudius
GrosFrankfurt UniversityFrankfurt, Germany
  • The spin-SAF Transition in the Quarter-Filled
    Ladder Compound NaV2O5

2
Phase Transition in NaV2O5 Experiment
  • 1/4-filled ladder compound
  • Smolinski, et al, 1998
  • Spin Gap
  • Isobe Ueda, 1996
  • 2D charge order
  • van Smaalen, et al, 2002
  • Grenier, et al, 2002
  • Chitov Gros, 2004 (SAF)
  • Phase transition
  • Thermal, close to 2D Ising universality class
  • Ravy, et al, 1999
  • Gaulin, et al, 2000
  • Fagot-Revurat, et al, 2000

Mechanism spin-Peierls - NO
ChargeSpin - ??
3
Model and Approximation
4
(No Transcript)
5
Spin-Pseudospin (Coupled) Model Phase Diagram
Coupled Model
Quantum Ising Model
  • Coupled Model always orders via spin-SAF
    transition
  • QCP is destroyed

6
Spin-SAF Theory Application to NaV2O5
E0
Optical Conductivity Damascelli, et al, 2000.
7
Summary Discussion
  • 1. Spin-pseudospin model is proposed and the
    theory of spin-SAF
  • transition is developed.
  • Spin-SAF phase simultaneous
    Super-AntiFerroelectric (SAF)
  • charge order spin gap.
  • 2. Numerical parameters of the effective
    Hamiltonian
  • Peaks in the optical conductivity, absence
    of the soft mode
  • 3. Further progress
  • (i) Marginal (log-) corrections for
    XXX-chains
  • Tc, BCS-ratio (work in progress)
  • (ii) Ising (pseudospin, i.e., charge) sector
    beyond mean-field (??)
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