Zobrazeno 1 - 10
of 69
pro vyhledávání: '"Alexei Kolezhuk"'
Publikováno v:
Journal of Physics: Conference Series. 51:39-42
The magnetic-excitation spectrum of copper pyrimidine dinitrate, a material containing S = 1/2 antiferromagnetic chains with alternating g-tensor and the Dzyaloshinskii-Moriya interaction, and exhibiting a field-induced spin gap, is probed using tuna
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::44a76982164f6458fdb607247f4c3185
https://doi.org/10.1088/1742-6596/51/1/006
https://doi.org/10.1088/1742-6596/51/1/006
Autor:
Alexei Kolezhuk, Hans-Jürgen Mikeska
Publikováno v:
Progress of Theoretical Physics Supplement. 159:376-386
We study the interplay of doping and an external magnetic field H on dimerized antiferromagnetic S = 1/2 systems with a finite spin gap Δ. We show that for sufficiently small three-dimensional coupling J' the long-range antiferromagnetic order known
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0bf2d165436d813a7d64f0fccc1058e9
https://doi.org/10.1143/ptps.159.376
https://doi.org/10.1143/ptps.159.376
Publikováno v:
Physical Review B. 59:13565-13568
We propose an effective theory for the critical phase of a quantum ferrimagnetic chain with alternating spins 1 and $\frac{1}{2}$ in an external magnetic field. With the help of the matrix product variational approach, the system is mapped to a spin-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8261f78cfab79e2758137a3d928413b2
https://doi.org/10.1103/physrevb.59.13565
https://doi.org/10.1103/physrevb.59.13565
Publikováno v:
Journal of Magnetism and Magnetic Materials. 310:1209-1211
Low-temperature ESR studies of copper pyrimidine dinitrate, a spin- 1 2 antiferromagnetic chain with alternating g -tensor and the Dzyaloshinskii–Moriya interaction, are presented. The ESR linewidth and g -factor shift are investigated as function
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::01d84ac87213c64bbf2f87904503ea8a
https://doi.org/10.1016/j.jmmm.2006.10.324
https://doi.org/10.1016/j.jmmm.2006.10.324
Publikováno v:
Journal of Magnetism and Magnetic Materials. 310:1218-1220
We have performed high-field/high-frequency ESR measurements on the spin gap system TlCuCl 3 in pulsed magnetic fields up to 55 T. The field dependence of the magnon excitation of TlCuCl 3 is studied above the field-induced quantum critical point at
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::72925e5fb5fa078fbe417d25e7f83537
https://doi.org/10.1016/j.jmmm.2006.10.345
https://doi.org/10.1016/j.jmmm.2006.10.345
Publikováno v:
Journal of Magnetism and Magnetic Materials. 310:e454-e456
The low-energy dynamics of the spin-gap magnet TlCuCl 3 is studied. Closing of the energy gap by a magnetic field at the critical field H c leads to the formation of the field-induced transverse antiferromagnetic order. The magnetic resonance techniq
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c5d50090e0a685b31f7dcf05b9d07042
https://doi.org/10.1016/j.jmmm.2006.10.367
https://doi.org/10.1016/j.jmmm.2006.10.367
We clarify the long-standing controversy concerning the behavior of the ground state fidelity in the vicinity of a quantum phase transition of the Berezinskii-Kosterlitz-Thouless type in one-dimensional systems. Contrary to the prediction based on th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9f6ba35ae758a1b28045e8d8d0cfaafc
Autor:
Boris A. Ivanov, Alexei Kolezhuk
Publikováno v:
Physical Review B. 56:8886-8893
In presence of a strong external magnetic field the dynamics of solitons in a one-dimensional easy-plane Heisenberg antiferromagnet exhibits a number of peculiarities. Dynamics of internal soliton degrees of freedom is essentially quantum, and they a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::59b1089e9f7429fd14f31cdf26d8dac7
https://doi.org/10.1103/physrevb.56.8886
https://doi.org/10.1103/physrevb.56.8886
Publikováno v:
Physical Review B. 55:8928-8939
In this paper we study a frustrated antiferromagnetic isotropic Heisenberg S=1 quantum spin chain H=${\ensuremath{\sum}}_{\mathrm{i}}$${\mathbf{S}}_{\mathrm{i}}$${\mathbf{S}}_{\mathrm{i}+1}$+\ensuremath{\alpha}${\ensuremath{\sum}}_{\mathrm{i}}$${\mat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8160db8270661a5d7457e5ae97b9b74c
https://doi.org/10.1103/physrevb.55.8928
https://doi.org/10.1103/physrevb.55.8928
Publikováno v:
Physical Review B 88 (2013), Nr. 19
We study, both numerically and analytically, the finite-size scaling of the fidelity susceptibility ${\ensuremath{\chi}}_{J}$ with respect to the charge or spin current in one-dimensional lattice models and relate it to the low-frequency behavior of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1aef76fc9dd684184570c9618bb0ee3e
https://doi.org/10.1103/physrevb.88.195101
https://doi.org/10.1103/physrevb.88.195101