Synthesis of double-layer perovskite fluoride K3Cu2F7 with spin gap and orbital order

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  • Manaka Hirotaka
    Department of Nano-Structure and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University
  • Miyashita Yusuke
    Department of Nano-Structure and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University
  • Watanabe Yusuke
    Department of Nano-Structure and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University
  • Masuda Takatsugu
    International Graduate School of Arts and Sciences, Yokohama City University

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  • Synthesis of Double-Layer Perovskite Fluoride K<SUB>3</SUB>Cu<SUB>2</SUB>F<SUB>7</SUB> with Spin Gap and Orbital Order

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We synthesized a single-phase polycrystalline sample of a double-layer perovskite fluoride K3Cu2F7. This compound is the new member of the potassium copper fluoride family, which has an antiferrodistortive orbital order (AFDOO). Magnetic susceptibility measurements revealed that K3Cu2F7 is a rare experimental realization of antiferromagnetically isolated spin dimers on a simple double-square lattice with no frustration, and that AFDOO causes ferromagnetic interactions in respective layers. The coexistence of spin gap and AFDOO is an exotic phenomenon both in quantum spin systems and strongly correlated electron systems.

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