Ferrimagnetic Heisenberg chain; influence of a random exchange interaction
نویسندگان
چکیده
منابع مشابه
Frustrated quantum Heisenberg ferrimagnetic chains
We study the ground-state properties of weakly frustrated Heisenberg ferrimagnetic chains with nearest and next-nearest neighbor antiferromagnetic exchange interactions and two types of alternating sublattice spins S1 > S2, using 1/S spin-wave expansions, density-matrix renormalization group, and exact-diagonalization techniques. It is argued that the zero-point spin fluctuations completely des...
متن کاملStochastic description of the dynamics of a random-exchange Heisenberg chain
We study the diffusion process in a Heisenberg chain with correlated spatial disorder, characterized by a power spectrum in the momentum space behaving as k−β, using a stochastic description. We establish a direct connection between the fluctuations in the spin-wave density of states and the noise density of states. For continuous ranges of the exponent β, we find super-diffusive and ballistic ...
متن کاملRandom-exchange quantum Heisenberg antiferromagnets on a square lattice
Nicolas Laflorencie,1 Stefan Wessel,2 Andreas Läuchli,3 and Heiko Rieger4 1Department of Physics & Astronomy, University of British Columbia, Vancouver, B.C., Canada V6T 1Z1 2Institut für Theoretische Physik III, Universität Stuttgart, 70550 Stuttgart, Germany 3Institut Romand de Recherche Numérique en Physique des Matériaux, EPFL, 1015 Lausanne, Switzerland 4Theoretische Physik, Universität de...
متن کاملSchwinger boson mean field theory of the Heisenberg Ferrimagnetic Spin Chain
The Schwinger boson mean field theory is applied to the quantum ferrimagnetic Heisenberg chain. There is a ferrimagnetic long range order in the ground state. We observe two branches of the low lying excitation and calculate the spin reduction, the gap of the antiferromagnetic branch, and the spin fluctuation at T = 0K. These results agree with the established numerical results quite well. At f...
متن کاملQuantum Monte Carlo Study of Random Antiferromagnetic Heisenberg Chain *
Effects of randomness on the spin-1 2 and 1 antiferromagnetic Heisen-berg chains are studied using the quantum Monte Carlo method with the continuous-time loop algorithm. We precisely calculated the uniform susceptibility , string order parameter, spatial and temporal correlation length, and the dynamical exponent, and obtained a phase diagram. The generalization of the continuous-time loop alg...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Applied Physics
سال: 1985
ISSN: 0021-8979,1089-7550
DOI: 10.1063/1.335094