Effects of Dstrain, gstrain, and dipolar interactions on EPR linewidths of the molecular.pdfVIP
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Effects of Dstrain, gstrain, and dipolar interactions on EPR linewidths of the molecular
Effects of D-strain, g-strain, and dipolar interactions on EPR
linewidths of the molecular magnets Fe8 and Mn12
1,∗ 1,† 2 3,‡ 1,4
Kyungwha Park , M. A. Novotny , N. S. Dalal , S. Hill , and P. A. Rikvold
1School of Computational Science and Information Technology, Florida State University,
3 Tallahassee, FL 32306
0
0 2Department of Chemistry, Florida State University, Tallahassee, FL 32306
2
b 3Department of Physics, Montana State University, Bozeman, MT 59717
e
F 4
Center for Materials Research and Technology and Department of Physics, Florida State
4
2
University, Tallahassee, FL 32306
3
v (February 1, 2008)
6
7
2
6
0
1 Abstract
0
/
t
a Electron paramagnetic resonance (EPR) measurements on single crystals of
m
-
d the molecular magnets Fe8 and Mn12 reveal complex nonlinearities in the
n
o linewidths as functions of energy eigenstate, frequency, and temperature. Us-
c
:
v ing a density-matrix equation with distributions of the uniaxial anisotropy pa-
i
X rameter D, the Land´e g factor, and dipolar interactions, we obtain linewidths
r
a
in good agreement with experiments. Our study shows that the distribution
in D is common to the examined molecular magnets Fe8 and Mn12 regardless
of the qualities of the samples. This could provide the basis for a proposed
tunneling mechanism due to lattice defects. The distribution in g
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