433 citations · 4.1k across the 129 of their papers we have counts for
17 papers · 1 filter
Cumulant expansion for systems with large spins
K. Kladko, P. Fulde, D. A. Garanin
A method is proposed for obtaining a systematic expansion of thermodynamic functions of spin systems with large spin S in powers of 1/S. It uses the cumulant technique and a cohere…
Ordering in magnetic films with surface anisotropy
D. A. Garanin
Effects of the surface exchange anisotropy on ordering of ferromagnetic films are studied for the exactly solvable classical spin-vector model with D \to \infty components. For sma…
Quantum-Classical Escape-Rate Transition of a Biaxial Spin System with a Longitudinal Field: a Perturbative Approach
D. A. Garanin, E. M. Chudnovsky
The quantum-classical transition of the escape rate of the spin model \cal H= -DS_z^2 - H_zS_z + B S_x^2 is investigated by a perturbative approach with respect to B [D. A. Garanin…
Curie Temperature of Anisotropic Ferromagnetic Films
D. A. Garanin
Dimensional crossover of ordering in ferromagnetic films with both periodic and free boundary conditions is studied for the exactly solvable uniaxial model of classical D-component…
Quantum-Classical Transition of the Escape Rate of a Uniaxial Spin System in an Arbitrarily Directed Field
D. A. Garanin, X. Martinez Hidalgo, E. M. Chudnovsky
The escape rate Γof the large-spin model described by the Hamiltonian H = -DS_z^2 - H_zS_z - H_xS_x is investigated with the help of the mapping onto a particle moving in a double-…
First- and Second-Order Transitions between Quantum and Classical Regimes for the Escape Rate of a Spin System
E. M. Chudnovsky, D. A. Garanin
We have found a novel feature of the bistable large-spin model described by the Hamiltonian H = -DS_z^2 - H_xS_x.The crossover from thermal to quantum regime for the escape rate ca…