Neutron diffraction and Mossbauer studies on Fe1-xCr2S4(x=0.0, 0.04, 0.08)

作者：Kim SJ; Kim WC; Kim CS^*

来源：Journal of Applied Physics, 2002, 91(10): 7935-7937.

DOI：10.1063/1.1451884

Polycrystalline samples of Fe1-xCr2S4(x=0.0, 0.04, 0.08) have been studied with x-ray and neutron powder diffraction, Mossbauer spectroscopy, magnetization, and magnetoresitance (MR) measurements. Neutron diffraction patterns were obtained at various temperature ranges from 10 K to room temperature. Neutron diffraction on FeCr2S4 above 10 K shows that there is no crystallographic distortion and reveals antiferromagnetic ordering, with the magnetic moment of Fe+2 (-3.52 mu(B)) aligned antiparallel to Cr3+ (2.72 mu(B)). Mossbauer spectra shows asymmetric line broadening in the temperature range from 13 to 170 K and it is considered to be dynamic Jahn-Teller stabilization. The charge states of the iron ions are ferrous in character. With increasing Fe deficiency, the peak of maximum magnetoresistance of x=0.0, 0.04, and 0.08, occurred at 171, 174, and 186 K, respectively. The increasing temperature of the MR peak position is interpreted as due to an enhancement of activation energy.

• 出版日期2002-5-15