Competing Jahn-Teller distortions and ferrimagnetic ordering in the geometrically frustrated system Ni1xCuxCr2O4

نویسندگان

  • M. Reehuis
  • M. Tovar
  • D. M. Többens
  • P. Pattison
  • A. Hoser
  • B. Lake
چکیده

Competing Jahn-Teller distortions combined with geometrical frustration give rise to a rich phase diagram as a function of x(Cu) and temperature in the spinel system Ni1xCuxCr2O4. The Jahn-Teller distortion of the end members acts in opposite ways with an elongation of the NiO4 tetrahedra resulting in a structural transition at TS1 = 317 K in NiCr2O4, but a flattening in the CuO4 tetrahedra at TS1 = 846 K in CuCr2O4, in both cases the

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تاریخ انتشار 2015