Veröffentlichungen des Teilprojekts A13, Förderperiode 2000-2002:

• M. Grüninger, D. van der Marel, A. Damascelli, A. Erb, T. Nunner, T. Kopp
  Midinfrared absorption in YBa₂Cu₃O₆: Evidence for a failure of spin-wave theory for spin ½ in two dimensions
  Phys. Rev. B 62, 12422 (2000)
• R. Frésard, T. Kopp
  Slave bosons in radial gauge: the correct functional integral Representation and inclusion of non-local interactions
  Nuclear Physics B 594, 769 - 789 (2001)
• M. Windt, M. Grüninger, T. Nunner, C. Knetter, K. Schmidt, G.S. Uhrig, T. Kopp, A. Freimuth, U. Ammerahl, B. Büchner, A. Revcolevschi
  Observation of two-magnon bound states in the two-leg ladders of (Ca,La)₁₄Cu₂₄ O₄₁
  Phys. Rev. Lett. 87, 127002 (2001)
• Q. Yuan, T. Nunner, T. Kopp
  Imperfect nesting and Peierls instability for a two dimensional tight-binding model
  Eur. Phys. J. B 22, 37 - 42 (2001).

• Q. Yuan, T. Kopp
  Coexistence of bond-order wave and antiferromagnetism in a two-dimensional half-filled Peierls-Hubbard model
  Phys. Rev. B 65, 085102 (2002)
• Q. Yuan
  A study of Peierls instabilities for a two-dimensional t-t' model
  Eur. Phys. J. B 25, 281 - 288 (2002)

• Q. Yuan, T. Kopp
  Charge ordering in half-doped Pr(Nd)_0.5Ca_0.5MnO₃ under magnetic field
  Phys. Rev. B 65, 174423 (2002)
• M. Grüninger, M. Windt, T. Nunner, C. Knetter, K.P. Schmidt, G.S. Uhrig, T. Kopp, A. Freimuth, U. Ammerahl, B. Büchner, A. Revcolevschi
  Optical spectroscopy of (La,Ca)₁₄Cu₂₄O₄₁ spin ladders: comparison of experiment and theory
  Physica B 312-313, 617 (2002)
• Yu.S. Barash, I.V. Bobkova, T. Kopp
  Josephson current in S-FIF-S junctions: Nonmonotonic dependence on misorientation angle
  Phys. Rev. B 66, 140503(R) (2002)
  
• T.S. Nunner, P. Brune, T. Kopp, M. Windt, and M. Grüninger
  Cyclic spin exchange in cuprate spin ladders
  Phys. Rev. B 66, 180404(R) (2002)
• M. Grüninger, M. Windt, T. Nunner, C. Knetter, K.P. Schmidt, G.S. Uhrig, T. Kopp, A. Freimuth, U. Ammerahl, B. Büchner, A. Revcolevschi
  Magnetic excitations in two-leg spin 1/2 ladders: experiment and theory
  J. Phys. and Chem. of Solids 63, 2167 (2002)
• M. Garst, T. Kopp
  Random-matrix theory: distribution of mesoscopic supercurrents through a chaotic cavity
  J. Low Temp. Phys. 126, 1305 (2002)