On the violation of Marshall-Peierls sign rule in the frustrated J1-J2 Heisenberg antiferromagnet J Richter, NB Ivanov, K Retzlaff
Europhysics Letters 25 (7), 545, 1994
90 1994 The antiferromagnetic spin-chain with competing dimers and plaquettes: numerical versus exact results J Richter, NB Ivanov, J Schulenburg
Journal of Physics: Condensed Matter 10 (16), 3635, 1998
77 1998 Competition between plaquette and dimer phases in Heisenberg chains NB Ivanov, J Richter
Physics Letters A 232 (3-4), 308-312, 1997
76 1997 Magnetic phases of the mixed-spin NB Ivanov, J Richter, DJJ Farnell
Physical Review B 66 (1), 014421, 2002
67 2002 Spin-wave series for quantum one-dimensional ferrimagnets NB Ivanov
Physical Review B 57 (22), R14024, 1998
62 1998 Heat capacity reveals the physics of a frustrated spin tube NB Ivanov, J Schnack, R Schnalle, J Richter, P Kögerler, GN Newton, ...
Physical review letters 105 (3), 037206, 2010
53 2010 Spin models of quasi-1D quantum ferrimagnets with competing interactions NB Ivanov
Condensed Matter Physics 12 (3), 435-447, 2009
49 2009 Discrete antiferromagnetic spin-wave excitations in the giant ferric wheel Fe J Ummethum, J Nehrkorn, S Mukherjee, NB Ivanov, S Stuiber, T Strässle, ...
Physical Review B—Condensed Matter and Materials Physics 86 (10), 104403, 2012
48 2012 Frustrated quantum Heisenberg ferrimagnetic chains NB Ivanov, J Richter, U Schollwöck
Physical Review B 58 (21), 14456, 1998
48 1998 Diamond chains with multiple-spin exchange interactions NB Ivanov, J Richter, J Schulenburg
Physical Review B—Condensed Matter and Materials Physics 79 (10), 104412, 2009
39 2009 Magnon dispersions in quantum Heisenberg ferrimagnetic chains at zero temperature NB Ivanov
Physical Review B 62 (5), 3271, 2000
39 2000 Frustrated two-dimensional quantum Heisenberg antiferromagnet at low temperatures NB Ivanov, PC Ivanov
Physical Review B 46 (13), 8206, 1992
39 1992 Phase diagram of a frustrated mixed-spin ladder with diagonal exchange bonds NB Ivanov, J Richter
Physical Review B—Condensed Matter and Materials Physics 69 (21), 214420, 2004
36 2004 Square-lattice Heisenberg antiferromagnet with two kinds of nearest-neighbor regular bonds NB Ivanov, SE Krüger, J Richter
Physical Review B 53 (5), 2633, 1996
36 1996 J1-J2 quantum Heisenberg antiferromagnet: improved spin-wave theories versus exact-diagonalization data NB Ivanov, J Richter
Journal of Physics: Condensed Matter 6 (20), 3785, 1994
30 1994 Antiferromagnetic sawtooth chain with spin- VR Chandra, D Sen, NB Ivanov, J Richter
Physical Review B 69 (21), 214406, 2004
27 2004 Analysis of the ground-state wave function of theJ 1 -J 2 quantum Heisenberg antiferromagnet K Retzlaff, J Richter, NB Ivanov
Zeitschrift für Physik B Condensed Matter 93, 21-31, 1993
21 1993 Collective excitations in ferrimagnetic Heisenberg ladders NB Ivanov, J Richter
Physical Review B 63 (14), 144429, 2001
19 2001 Phase diagram of the alternating-spin Heisenberg chain with extra isotropic three-body exchange interactions NB Ivanov, J Ummethum, J Schnack
The European Physical Journal B 87, 1-13, 2014
16 2014 Spin-wave results for the XXZ triangular antiferromagnet with next-nearest-neighbor couplings NB Ivanov
Physical Review B 47 (14), 9105, 1993
15 1993 
Johannes RichterOtto von Guericke Universität Magdeburg, Professor (emeritus) for Theoretical PhysicsEmail verificata su Physik.Uni-Magdeburg.DE
