Geodesic
Calculations of the onset temperature for tunneling in multispin systems
Nanosistemy: fizika, himiâ, matematika, Tome 8 (2017) no. 4, pp. 454-461 Cet article a éte moissonné depuis la source Math-Net.Ru

Voir la notice de l'article

Transitions between magnetic states of a system coupled to a heat bath can occur by exceeding the energy barrier, but as temperature is lowered quantum mechanical tunneling through the barrier becomes the dominant transition mechanism. A method is presented for estimating the onset temperature for tunneling in a system with an arbitrary number of spins using the second derivatives of the energy with respect to the orientation of the magnetic vectors at the first order saddle point on the energy surface characterizing the over-the-barrier mechanism. An application to a monomer and a dimer of molecular magnets containing a Mn$_4$ group is presented and the result found to be in excellent agreement with reported experimental measurements.
Keywords: magnetic transitions, tunneling, rate theory, molecular magnet. 
@article{NANO_2017_8_4_a6,
     author = {S. M. Vlasov and P. F. Bessarab and V. M. Uzdin and H. J\'onsson},
     title = {Calculations of the onset temperature for tunneling in multispin systems},
     journal = {Nanosistemy: fizika, himi\^a, matematika},
     pages = {454--461},
     year = {2017},
     volume = {8},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/NANO_2017_8_4_a6/}
}
TY  - JOUR
AU  - S. M. Vlasov
AU  - P. F. Bessarab
AU  - V. M. Uzdin
AU  - H. Jónsson
TI  - Calculations of the onset temperature for tunneling in multispin systems
JO  - Nanosistemy: fizika, himiâ, matematika
PY  - 2017
SP  - 454
EP  - 461
VL  - 8
IS  - 4
UR  - http://geodesic.mathdoc.fr/item/NANO_2017_8_4_a6/
LA  - en
ID  - NANO_2017_8_4_a6
ER  - 
%0 Journal Article
%A S. M. Vlasov
%A P. F. Bessarab
%A V. M. Uzdin
%A H. Jónsson
%T Calculations of the onset temperature for tunneling in multispin systems
%J Nanosistemy: fizika, himiâ, matematika
%D 2017
%P 454-461
%V 8
%N 4
%U http://geodesic.mathdoc.fr/item/NANO_2017_8_4_a6/
%G en
%F NANO_2017_8_4_a6
S. M. Vlasov; P. F. Bessarab; V. M. Uzdin; H. Jónsson. Calculations of the onset temperature for tunneling in multispin systems. Nanosistemy: fizika, himiâ, matematika, Tome 8 (2017) no. 4, pp. 454-461. http://geodesic.mathdoc.fr/item/NANO_2017_8_4_a6/