Development of novel multiferroics with stress field cross correlation

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In material development of organic compounds(AA)_2TX_4 with K_2NiF_4 type structure, we established very fast single-crystal growing technique for the compound with Fe, Ma, Co, Cu, Zn. We found electric dipole ordering at 26 and 37K in EACuC for the first time and show it is a potential multiferroic. We determined space groups of all structural phases of EAFeC. In EACuC, we also determined space group of each structural phase and corrected previous reports. In turn, on potential of multiferroic in rare earth compound, we found antiferroquarupolar ordering in PrIr_2Zn_<20>. The quadrupolar fluctuation is pointed out as the potential origin for the novel superconductivity in this material. These findings may contribute to develop a new technology which controls superconductivity by the stress fields.