TY - JOUR
T1 - Neutron magnetic scattering studies on ferromagnetism in potassium nanoclusters arrayed in zeolite A-Trial experiments
AU - Nakano, T.
AU - Takase, T.
AU - Araki, S.
AU - Kamiyama, T.
AU - Nozue, Y.
AU - Ikeda, S.
N1 - Funding Information:
We are grateful to Dr. I. Tsukushi and Dr. F. Shikanai for their support in the experiments. This work was supported by Grant-in-Aid for Creative Scientific Research (no. 15GS0213) and Grant-in-Aid Scientific Research on Priority Areas (no. 19051009) from MEXT Japan, and also by the 21st Century COE Program named “Towards a new basic science: depth and synthesis”.
PY - 2009/2/21
Y1 - 2009/2/21
N2 - Potassium clusters arrayed in zeolite A are known to show ferromagnetic properties at low temperature. The origin of the spontaneous magnetization has been explained by a model of spin-canting in an antiferromagnetically ordered state. The direct information for the magnetic structure, however, has not been obtained so far. In the present work, we measure the neutron powder diffraction by using pulsed neutron source at KEK-KENS below and above the Curie temperature. No significant temperature-dependence was, however, obtained within the statistical errors, namely, magnetic scattering could not be detected separately. We also estimate the intensity of magnetic scattering by assuming some possible magnetic structures with considering the magnetic form factor of the cluster wave function. The intensity of magnetic scattering is estimated to be extremely weak and higher S/N of ∼104 or more is required to detect the magnetic scattering of this material.
AB - Potassium clusters arrayed in zeolite A are known to show ferromagnetic properties at low temperature. The origin of the spontaneous magnetization has been explained by a model of spin-canting in an antiferromagnetically ordered state. The direct information for the magnetic structure, however, has not been obtained so far. In the present work, we measure the neutron powder diffraction by using pulsed neutron source at KEK-KENS below and above the Curie temperature. No significant temperature-dependence was, however, obtained within the statistical errors, namely, magnetic scattering could not be detected separately. We also estimate the intensity of magnetic scattering by assuming some possible magnetic structures with considering the magnetic form factor of the cluster wave function. The intensity of magnetic scattering is estimated to be extremely weak and higher S/N of ∼104 or more is required to detect the magnetic scattering of this material.
KW - Alkali metal cluster
KW - Ferromagnetism
KW - Neutron magnetic scattering
KW - Zeolite
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U2 - 10.1016/j.nima.2008.11.038
DO - 10.1016/j.nima.2008.11.038
M3 - Article
AN - SCOPUS:59649114508
SN - 0168-9002
VL - 600
SP - 240
EP - 242
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
IS - 1
ER -