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Magnetism of SrM3P4O14 (M2+ = 3d Ions) Investigated Using Neutron-scattering Measurements
Masashi Hase,Andreas D¨onni,Osamu Sakai,Kiyoshi Ozawa,Hideaki Kitazawa,Vladimir Yu. Pomjakushin,Lukas Keller,Tao Yang,Rihong Cong,Jianhua Lin 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The substances SrM3P4O14 (M = Mn, Fe, Co or Ni) have the same crystal structure. However,the magnetism of SrMn3P4O14 differs qualitatively from that of the other substances. We determinedthe magnetic structures of SrM3P4O14 (M = Mn or Co) by using neutron powder diffractionmeasurements. The spin system in SrMn3P4O14 can be regarded as a trimerized spin chain, whichis consistent with the spin system inferred from the crystal structure and the appearance of the 1/3quantum magnetization plateau. The spin system in SrCo3P4O14 is not a trimerized spin chain.
Thermal, Dielectric, and Magnetic Properties in Multiferroic Cu2.85Zn0.15Mo2O9
Haruhiko Kuroe,Kento Aoki,Ryusuke Itoh,Tomohiro Hosaka,Takuya Hasegawa,Suguru Hachiuma,Mitsuru Akaki,Hideki Kuwahara,Tomoyuki Sekine,Masashi Hase,Kunihiko Oka,Toshimitsu Ito,Hiroshi Eisaki 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We study the effects of Zn substitution on single crystals of the low-dimensional multiferroicmaterial Cu3Mo2O9. We report the magnetic field-temperature phase diagram obtained from thetemperature and the magnetic field dependences of the specific heat, the dielectric constant, thedifferential magnetization, and the electric polarization-electric field curve in Cu2.85Zn0.15Mo2O9. We obtain three phases: a paraelectric and a ferroelectric phase, and a ferroelectric phase with alarge coercive electric field. The origin of the last one is discussed based on the charge redistributioneffect on a half-filled Mott insulator. In this phase, the Zn substitution induces a robust localizedferroelectric polarization that increases the coercive electric field.