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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},
}