Magnetic field dependence of the spin structure of CdMn7O12
(AA’)4B4O12 type perovskite CdMn7O12 has been synthesized by high pressure method. This compound shows two successive magnetic transitions at TN1 = 88 K and TN2 = 33 K, respectively, in zero external magnetic field condition. The transition at TN1 is very robust against the magnetic field while the TN2 transition is gradually suppressed. Additional magnetic transition also appears between TN1 and TN2 with magnetic field of 9 T. Moreover, dielectric constant shows no anomaly in zero external magnetic field, whereas a sharp increase at TN1 is observed when a field is larger than 3 T, suggesting a magnetic field induced ferroelectricity. However, the relationship between the magnetic structure and ferroelectricity is no clear due to the lack of information about the magnetic structure, which is partially due to the strong neutron aborption effect by the Cd atoms. In order to uncover the relationship between the magnetic transition and dielectric anomaly, we propose to perform powder neutron diffraction with a special method on CdMn7O12 as a function of magnetic fields using the D20 diffractometer.
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GUO Hanjie; FERNANDEZ DIAZ Maria Teresa and KOMAREK Alexander Christoph. (2018). Magnetic field dependence of the spin structure of CdMn7O12. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2566
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