TY - JOUR
T1 - Magnetic Foehn Effect in Adiabatic Transition
AU - Saito, Keiji
AU - Miyashita, Seiji
N1 - Copyright:
Copyright 2005 Elsevier B.V., All rights reserved.
PY - 2001/11
Y1 - 2001/11
N2 - The magnetization process as a response to a sweeping magnetic field in the thermal environment is investigated by using the quantum master equation. In a slow sweeping velocity region where the system shows quasi-adiabatic motion, a magnetic plateau in the magnetization process has been observed in the recent experiment of V15, [Phys. Rev. Lett. 84 (2000) 3454]. Although the experiment was explained from a view of small capacity of the phonon heat bath, i.e., the phonon bottleneck effect, we found that a magnetic plateau appears almost regardless of the properties of the heat bath in the quasi-adiabatic transition and the appearance of the plateau is quire universal. We call it 'Magnetic Foehn effect'. On the other hand, the magnetic plateau also appears in a fast sweeping velocity region by the Landau-Zener-Stückelberg mechanism which is different from the above mechanism in a slow sweeping region, and we study the crossover between them. We also propose an experiment which clarifies the structure of coupling to the thermal reservoir.
AB - The magnetization process as a response to a sweeping magnetic field in the thermal environment is investigated by using the quantum master equation. In a slow sweeping velocity region where the system shows quasi-adiabatic motion, a magnetic plateau in the magnetization process has been observed in the recent experiment of V15, [Phys. Rev. Lett. 84 (2000) 3454]. Although the experiment was explained from a view of small capacity of the phonon heat bath, i.e., the phonon bottleneck effect, we found that a magnetic plateau appears almost regardless of the properties of the heat bath in the quasi-adiabatic transition and the appearance of the plateau is quire universal. We call it 'Magnetic Foehn effect'. On the other hand, the magnetic plateau also appears in a fast sweeping velocity region by the Landau-Zener-Stückelberg mechanism which is different from the above mechanism in a slow sweeping region, and we study the crossover between them. We also propose an experiment which clarifies the structure of coupling to the thermal reservoir.
KW - Magnetic tunneling
KW - Nonadiabatic transition
UR - http://www.scopus.com/inward/record.url?scp=0035605072&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0035605072&partnerID=8YFLogxK
U2 - 10.1143/JPSJ.70.3385
DO - 10.1143/JPSJ.70.3385
M3 - Article
AN - SCOPUS:0035605072
VL - 70
SP - 3385
EP - 3390
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 11
ER -