62 citations · 508 across the 21 of their papers we have counts for
21 papers
Heisenberg spin chains with additional isotropic three-site exchange interactions
N. B. Ivanov
The Heisenberg spin models with nearest-neighbor () and additional isotropic three-site () spin interactions remain relatively less explored, although such type…
Phase diagram of the alternating-spin Heisenberg chain with extra isotropic three-body exchange interactions
N. B. Ivanov, J. Ummethum, J. Schnack
For the time being isotropic three-body exchange interactions are scarcely explored and mostly used as a tool for constructing various exactly solvable one-dimensional models, alth…
Discrete antiferromagnetic spin-wave excitations in the giant ferric wheel Fe18
J. Ummethum, J. Nehrkorn, S. Mukherjee +8
The low-temperature elementary spin excitations in the AFM molecular wheel Fe18 were studied experimentally by inelastic neutron scattering and theoretically by modern numerical me…
Heat capacity uncovers physics of a frustrated spin tube
N. B. Ivanov, J. Schnack, R. Schnalle +6
We report on refined experimental results concerning the low-temperature specific heat of the frustrated spin tube material [(CuCl2tachH)3Cl]Cl2. This substance turns out to be an…
Frustrated spin ladder with alternating spin-1 and spin-1/2 rungs
V. Ravi Chandra, N. B. Ivanov, J. Richter
We study the impact of the diagonal frustrating couplings on the quantum phase diagram of a two-leg ladder composed of alternating spin-1 and spin-1/2 rungs. As the coupling streng…
Spin models of quasi-1D quantum ferrimagnets with competing interactions
N. B. Ivanov
We present a brief survey of the recent theoretical work related to generic Heisenberg spin models describing quasi-one-dimensional quantum ferrimagnets. The emphasis is on quantum…