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@ARTICLE{Fu:278947,
author = {Fu, Zhendong and Xiao, Yinguo and Su, Yixi and Zheng,
Yanzhen and Kögerler, Paul and Brückel, Thomas},
title = {{L}ow-lying magnetic excitations and magnetocaloric effect
of molecular magnet {K} $_{6}$ [{V} $_{15}$ {A}s $_{6}$ {O}
$_{42}$ ({H} $_{2}$ {O})] · 8{H} $_{2}$ {O}},
journal = {epl},
volume = {112},
number = {2},
issn = {0295-5075},
address = {Les-Ulis},
publisher = {EDP Science65224},
reportid = {FZJ-2015-07122},
pages = {27003},
year = {2015},
abstract = {Low-temperature heat capacity measurements were performed
on the molecular nanomagnet
$\text{K}_{6}[\text{V}_{15}\text{As}_{6}\text{O}_{42}(\text{H}_{2}\text{O})]
\cdot8\text{H}_{2}{\text{O}}$ (V15). The low-lying magnetic
excitations are clearly evidenced by the Schottky anomalies
in the specific-heat data. The energy levels determined from
the low-temperature observables agree well with the
three-spin model for V15. The magnetocaloric effect of V15
is examined. The maximum entropy change of $5.31\
\text{Jkg}^{-1}\text{K}^{-1}$ is found for a field change of
$\Delta H =(8-0.5)\ \text{T}$ at ${\sim}1.5\ \text{K}$ . In
spite of the low ground-state spin of V15, a drastic entropy
change of $4.12\ \text{Jkg}^{-1}\text{K}^{-1}$ is observed
for a field change of $\Delta H = (8-0.05)\ \text{T}$ at 0.4
K, which is comparable to the entropy change of some
high-spin sub-kelvin magnetic coolers at such low
temperatures. Anisotropy and consequent zero-field splitting
result in this characteristic of V15 and may open new
possibilities in the design of ultra-low-temperature
molecular coolers.},
cin = {JCNS-FRM-II / JCNS-2 / PGI-4 / PGI-6},
ddc = {530},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
I:(DE-Juel1)PGI-6-20110106},
pnm = {524 - Controlling Collective States (POF3-524) / 6212 -
Quantum Condensed Matter: Magnetism, Superconductivity
(POF3-621) / 6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich
Centre for Neutron Research (JCNS) (POF3-623)},
pid = {G:(DE-HGF)POF3-524 / G:(DE-HGF)POF3-6212 /
G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
experiment = {EXP:(DE-MLZ)NOSPEC-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000365323000023},
doi = {10.1209/0295-5075/112/27003},
url = {https://juser.fz-juelich.de/record/278947},
}