The magnetic and dielectric properties ofåkermanite Sr 2 CoSi 2 O 7 single crystals in high magnetic fields were investigated. We have observed finite induced electric polarization along the c axis in high fields, wherein all Co spins were forcibly aligned to the magnetic field direction. Existence of the induced polarization in the spin-polarized state accompanied with the finite slope in the magnetization curve suggests the possible role of the orbital angular momenta in the excited states as its microscopic origin. The emergence of the field-induced polarization without particular magnetic order can be regarded as the magnetoelectric effects of the second order from the symmetry point of view. A low magnetic field-driven electric polarization flip induced by a rotating field, even at room temperature, has been successfully demonstrated.

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A novel polymeric nitridomanganese(V) complex with a Schiff base ligand [MnN(salpn)] (H2(salpn): N,N′-disalicylidene-1,3-propanediamine) (1) was prepared by photolysis of the azidomanganese(III) complex, [MnN3(salpn)] in acetonitrile. The monomeric complex (2) was obtained by recrystallization of 1 from methanol. X-Ray crystal structure analyses of 1 and 2 were carried out. The brown complex 1 has a linear ···Mn≡N···Mn≡N··· chain structure.

The title compound, [MnN(C(28)H(22)N(2)O(2))], has a distorted square-pyramidal coordination with an Mn[triple-bond]N bond length of 1.516 (2) A at the apical position. The five-membered chelate ring adopts a gauche conformation with the two phenyl groups in equatorial orientations.