J. Schulenburg, Forschungsbeleg, Okt1993 LANG=de
    "Berechnungen des Grundzustandes eines wechselwirkenden
    Download: fbeleg93.pdf 291kB
    Keywords: Hubbardmodell, Heisenbergmodell, Eigenzustaende, N=2..4,8,16

    J. Schulenburg, Diplomarbeit, Aug1994 LANG=de
    "Ferromagnetismus in isolierenden Übergangsmetallverbindungen"
    Download: dipl94.pdf 553kB
    Keywords: Hubbardmodell, Ferromagnetismus, Exakte Diagonalisierung,
              Stoerungstheorie, Austauschwechselwirkung

    S. Feldkemper, W. Weber, J. Schulenburg and J. Richter
    Ferromagnetic coupling in nonmetallic Cu$^{2+}$ compounds
    Phys.Rev.B {\bf 52}, 313 (1995)

    J. Richter, C. Gros, S. Kr\"uger, W. Wenzel and J. Schulenburg
    Phase transitions in two-layer spin 1/2 antiferromagnets with
    competing intra-layer and inter-layer couplings
    J.Magn.Magn.Mat. {\bf 156}, 433-434 (1996) 
    % Journal of Magnetism and Magnetic Materials

    R. Hayn, A.F. Barabanov, J. Schulenburg and J. Richter
    The one-hole motion in the 2D frustrated t-J model
    Phys. Rev. B, {\bf 53}, 11714 (1996) 

    R. Hayn, A.F. Barabanov, J. Schulenburg
    Non-rigid hole band in the extended t-J model
    Zeitschrift f\"ur Physik B {\bf 102}, 359-366 (1997)

    J. Schulenburg, J. Richter
    Ferromagnetic groundstate of a two band Hubbard model
    with one electron per site
    Acta Physica Polonica A {\bf 91}, 367-370 (1997),
    Proceedings of the Conference Physics of Magnetism 96 % PM96

    J. Schulenburg, J. Richter
    Numerical study of the Goodenough-Kanamori-Anderson mechanism in a
    two-band Hubbard model
    Physica B (230-232) 1044-1046 (1997)  % SCES 96

    J. Richter, N.B.Ivanov, J.Schulenburg
    The antiferromagnetic spin-1/2 chain with competing dimers and
    plaquettes: numerical versus exact results
    Journal of Physics: Condensed Matter {\bf 10}, 3635-3649 (1998)

    H.Rosner, R.Hayn, J.Schulenburg
    Tight-binding parameters and exchange integrals of Ba2Cu3O4Cl2
    Physical Review B {\bf 57}, 13660-13666 (1998)
    % cond-mat/9705153

    J.Richter, A.Voigt, J.Schulenburg, N.B.Ivanov and R.Hayn
    Magnetic model for Ba2Cu3O4Cl2
    % cond-mat/9711243
    JMMM 177-181 (1998) p.737-738 % ICM Aug97 Australien

    D.D.Betts, J.Schulenburg, G.E.Stewart, J.Richter, J.S.Flynn
    Finite bcc lattices and their use in exact diagonalization of the
    S=1/2 Heisenberg antiferromagnet to estimate its T=0 properties
    on the infinite lattice,
    J. Phys. A: Math. Gen. {\bf 31} (1998) 7685-7698
    % cond-mat/9809405

    J.Schulenburg, J.Richter, D.D.Betts
    Heisenberg antiferromagnet on a 1/7-depleted triangular lattice
    Acta physica polonica A {\bf 97} No.5, 971-974 (2000)
    Proceedings of the European Conference "Physics of Magnetism '99",
    Poznan 1999

    S.E.Kr\"uger, J.Richter, J.Schulenburg
    Quantum phase transitions of a square-lattice Heisenberg antiferromagnet
    with two kinds of nearest-neighbor bonds: A high-order coupled-cluster
    Phys.Rev.B {\bf 61} 14607-14615 (2000) % cond-mat/0003126

   J.Schulenburg, J.S.Flynn, D.D.Betts, J.Richter
   Exact diagonalization of the S = 1/2 XY ferromagnet on
   finite bcc lattices to estimate T = 0
   properties on the infinite lattice
   Eur.Phys.J.B. {\bf 21}, 191 (2001) % cond-mat/0105291

   P.Tomczak, J.Schulenburg, J.Richter, A.R.Ferchmin
   The ground state of the spin-1/2 Heisenberg antiferromagnet on
   an Archimedian 4-6-12 lattice
   J.Phys.: Condens. Matter 13 (2001) 3851-3857 % cond-mat/0104137

   J. Schnack, H.J. Schmidt, J. Richter and J. Schulenburg
   "Independent magnon states on magnetic polytopes",
    Eur. Phys. J. B 24, 475 (2001) % cond-mat/0108432

   J. Schulenburg, J. Richter,
   Infinite series of magnetization plateaus in the
   frustrated dimer-plaquette chain
   Phys. Rev. B 65, 054420 (2002) % cond-mat/0107137

   Schulenburg,J. / Honecker,A. / Schnack,J.  / Richter,J./ Schmidt,H.-J.
   Macroscopic magnetization jumps due to independent
   magnons in frustrated quantum spin lattices  
   Phys. Rev. Lett. 88, 167207 (2002) % cond-mat/0108498

   Schmalfuss,D. / Tomczak,P. / Schulenburg,J.  / Richter,J.
   The spin-1/2 Heisenberg antiferromagnet
   on a 1/7-depleted triangular lattice:  Ground-state properties
   Phys. Rev. B 65, 224405 (2002) % cond-mat/0201584

   R. Schmidt, J. Schulenburg, J. Richter, D.D. Betts
   Spin-1/2 J1-J2 model on the body-centered cubic lattice
   Phys. Rev. B 66, 224406 (2002) % cond-mat/0203085

  J. Schulenburg, J. Richter
  Sequence of first-order quantum phase transitions in
    a frustrated spin half dimer-plaquette chain
  Phys. Rev. B 66, 134419 (2002) % cond-mat/0206538

  Dissertation, Jörg Schulenburg, Jan. 2003, LANG=de
  "Einfluß der Gitterstruktur auf den Grundzustand
  von s=1/2-Quantenspinsystemen"
  Keywords: Heisenbergmodell, Archimedische Gitter (archimedian tilings)
  Dissertation ca. 2MB, Download: SHIFT-Taste + Mausklick
  ps-version ca. 1MB, Mozilla-Download: SHIFT-Taste + Mausklick
   Page 92: Tiling 4, N=36, cD=0.008628 instead of -0.037491 (April 2003)

  J. Schulenburg, J. Richter
  Macroscopic Magnetization Jumps in Strongly Frustrated Quantum Spin Lattices
  Springer Proceedings in Physics 90, p. 29 (2003)
  % D.P. Landau e.a.,  Computer Simulation Studies in Condensed Matter Physics XV

  D. Schmalfuss, R. Herms, J. Richter and J. Schulenburg,
  Ground-state phases in a system of two competing
    square-lattice Heisenberg antiferromagnets
  J. Phys.: Condens. Matter 15 No 17 (7 May 2003) 2667-2679 % cond-mat/0301095

  A. Honecker, J. Schulenburg, J. Richter
    Magnetization plateaus in frustrated antiferromagnetic quantum spin models
  J. Phys.: Condens. Matter 16 No 11 (24 March 2004) S749-S758
  % cond-mat/0309425,

  J. Richter, J. Schulenburg, A. Honecker, J. Schnack, H.-J. Schmidt
  Exact eigenstates and macroscopic magnetization jumps
    in strongly frustrated spin lattices
  J. Phys.: Condens. Matter 16 (24 March 2004) S779-S784 % cond-mat/0309455

  Johannes Richter, Oleg Derzhko, J/"org Schulenburg
  Magnetic-field induced spin-Peierls instability in strongly frustrated
    quantum spin lattices
  % cond-mat/0312216
  Phys. Rev. Lett. 93, 107206 (2004)

  J. Richter, J.Schulenburg, A. Honecker, D. Schmalfuss
  Absence of magnetic order for the spin-half Heisenberg antiferromagnet on
  the star lattice
  Phys.Rev.B 70, 174454 (2004)

  D.C. Cabra, M.D. Grynberg, P.C.W. Holdsworth, A. Honecker, P. Pujol,
  J. Richter, D. Schmalfuss, J. Schulenburg
  Quantum kagome antiferromagnet in a magnetic field: Low-lying
  non-magnetic excitations versus valence-bond crystal order
  % cond-mat/0404279
  Phys. Rev. B 71, 144420 (2005)

  J. Schulenburg:  GOCR - OCR fuer Linux,
  Linux+ 5/2005 p34-36,
  Software-Wydawnictwo Publishing House,

  D.J.J. Farnell, J. Schulenburg, J. Richter, K.A. Gernoth
  High-order coupled cluster calculations via parallel processing:
  An illustration for CaV4O9
  Phys. Rev. B 72, 172408 (2005)  % cond-mat/0511544

  Dirk Schmalfuss, R. Darradi, J. Richter, J. Schulenburg, D. Ihle
  Quantum $J sub 1$-$J sub 2$ antiferromagnet on a stacked square
  lattice: Influence of the interlayer coupling on the ground-state
  magnetic ordering
  Phys. Rev. Lett. 97, 157201 (2006)

  J. Schnack, H.-J. Schmidt, A. Honecker, J. Schulenburg and J. Richter
  Exact eigenstates of highly frustrated spin lattices probed in high fields
  J. Phys.: Conf. Ser. 51 43-46 (2006)

  F.Ouchni, J.Schnack, J.Schulenburg
  Exact diagonalization of a one-dimensional Hubbard model at density rho=0.4:
  Effects of Coulomb repulsions and distant transfer
  Phys. Rev. B 76, 195106 (2007)

  R. Zinke, J. Schulenburg, J. Richter
  Ground-state long-range order in quasi-one-dimensional
  Heisenberg quantum antiferromagnets: high-order coupled-cluster calculations
  Eur. Phys. J. B 61, 147-152 (2008) (see

  R. F. Bishop, P. H. Y. Li, R. Darradi, J. Schulenburg, and J. Richter
  Effect of anisotropy on the ground-state magnetic ordering of the spin-half
  quantum J[sub 1][sup XXZ]--J[sub 2][sup XXZ] model on the square lattice
  Physical Review B (Vol.78, No.5)
  % URL:
  % DOI: 10.1103/PhysRevB.78.054412

  R. Darradi,  O. Derzhko,  R. Zinke,  J. Schulenburg,
  S.E. Kr\"{u}ger,  J. Richter
  Ground state phases of the spin-$\frac{1}{2}$ $J_1$--$J_2$
  Heisenberg antiferromagnet on the square lattice: A high-order
  coupled cluster treatment
  Phys. Rev. B 78, 214415 (2008)
  % URL:
  % URL:
  % DOI: 10.1103/PhysRevB.78.214415

  D. J. J. Farnell, R. Zinke, J. Richter, J. Schulenburg,
  High-Order Coupled Cluster Method Study of Frustrated and
  Unfrustrated Quantum Magnets in External Magnetic Fields 
  J. Phys.: Condens. Matter 21 (2009) 406002.
  % URL:
  % URL:

  J. Richter, J. Schulenburg, P. Tomczak, D. Schmalfuss
  The Heisenberg antiferromagnet on the square-kagome lattice
  Cond. Matter Phys. {\bf 12}, 507 (2009)
  % (special issue on spin systems).
  J.Richter, J. Schulenburg,
  The spin-1/2 J1-J2 Heisenberg antiferromagnet on the square lattice:
  Exact diagonalization for N=40 spins
  Eur. Phys. J. B 73, 117-124 (2010)
  % DOI: 10.1140/epjb/e2009-00400-4

  O. Goetze, S. E. Krueger, F. Fleck, J. Schulenburg, and J. Richter,
  "Ground-state phase diagram of the spin-$\frac{1}{2}$ square-lattice
  $J_{1}$-$J_{2}$ model with plaquette structure"
  Phys. Rev. B 85, 224424 (2012) [9 pages] 
  % URL: [1.2MB]
  % DOI: 10.1103/PhysRevB.85.224424
  % [427kB]