%FBeleg93
    J. Schulenburg, Forschungsbeleg, Okt1993 LANG=de
    "Berechnungen des Grundzustandes eines wechselwirkenden
    Fermionensystems"
    Download: fbeleg93.pdf 291kB
    Keywords: Hubbardmodell, Heisenbergmodell, Eigenzustaende, N=2..4,8,16

%Dipl94
    J. Schulenburg, Diplomarbeit, Aug1994 LANG=de
    "Ferromagnetismus in isolierenden Übergangsmetallverbindungen"
    Download: dipl94.pdf 553kB
    Keywords: Hubbardmodell, Ferromagnetismus, Exakte Diagonalisierung,
              Stoerungstheorie, Austauschwechselwirkung

%01
    S. Feldkemper, W. Weber, J. Schulenburg and J. Richter
    Ferromagnetic coupling in nonmetallic Cu$^{2+}$ compounds
    Phys.Rev.B {\bf 52}, 313 (1995)

%02
    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

%03
    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) 

%04
    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)

%05
    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

%06
    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

%07
    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)

%08
    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

%09
    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


%10
    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

%11
    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

%12
    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
    treatment
    Phys.Rev.B {\bf 61} 14607-14615 (2000) % cond-mat/0003126

%13
   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

%14
   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

%15
   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

%16
   J. Schulenburg, J. Richter,
   Infinite series of magnetization plateaus in the
   frustrated dimer-plaquette chain
   Phys. Rev. B 65, 054420 (2002) % cond-mat/0107137

%17
   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

%18
   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

%19
   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

%20
  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

%Diss
  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
  Errata:
   Page 92: Tiling 4, N=36, cD=0.008628 instead of -0.037491 (April 2003)
   Page 58: Abbildung 4.2, Tiling 6, Frustration = -0.6 (wrong: -0.8, Mai 2018)
   Page 137: Abbildung 4.59 Tiling 6 wie Abb. 4.2
    also: Lect. Notes Phys 645, 85-153 (2004) Fig. 2.2 and Fig. 2.22

%21
  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

%22
  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

%23
  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, http://stacks.iop.org/0953-8984/16/S749

%24
  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
  % http://www.iop.org/EJ/abstract/0953-8984/16/11/029/

%25
  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)

%26
  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)

%27
  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)

%28
  J. Schulenburg:  GOCR - OCR fuer Linux,
  Linux+ 5/2005 p34-36,
  Software-Wydawnictwo Publishing House, www.lpmagazine.org

%29
  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

%30
  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)

%31
  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)

%32
  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)

%33
  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 www.epj.org)

%34
  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: http://link.aps.org/abstract/PRB/v78/e054412
  % DOI: 10.1103/PhysRevB.78.054412

%35
  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: http://link.aps.org/abstract/PRB/v78/e214415
  % URL: http://link.aps.org/doi/10.1103/PhysRevB.78.214415
  % DOI: 10.1103/PhysRevB.78.214415

%36
  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: http://stacks.iop.org/0953-8984/21/406002
  % URL: http://arxiv.org/abs/0908.2881

%37
  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).
             
%38
  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

%39
  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: http://prb.aps.org/abstract/PRB/v85/i22/e224424 [1.2MB]
  % DOI: 10.1103/PhysRevB.85.224424
  % http://arxiv.org/abs/1205.0681 [427kB]
  
  ...
  
  T. Krokhmalskii, V. Baliha, O. Derzhko, J. Schulenburg, and J. Richter:
  Frustrated honeycomb-lattice bilayer quantum antiferromagnet
   in a magnetic field
  % arXiv:1706.07909
  %doi = "https://doi.org/10.1016/j.physb.2017.09.064",
  %url = "http://www.sciencedirect.com/science/article/pii/S0921452617306464",
  % SCES 2017
      
  T. Krokhmalski, V. Baliha, O. Derzhko, J. Schulenburg, and J. Richter:
  Frustrated honeycomb-lattice bilayer quantum antiferromagnet in a
   magnetic field:  Unconventional phase transitions in a two-dimensional
   isotropic Heisenberg model
  Phys. Rev. B {\bf  95}, 094419 (2017)
  
  R. F. Bishop, P. H.Y. Li, R. Zinke, R. Darradi, J. Richter,
    D. J.J. Farnell, and J. Schulenburg:
  The Spin-Half {\it XXZ} Antiferromagnet on the Square Lattice
  Revisited: A High-Order Coupled Cluster Treatment
  J. Magn. Magn. Mat. {\bf  428}, 178 (2017)
  %arXiv:1608.06157