Magnetic, electronic, and thermal transport properties of the quasi-two-dimensional Sr3Fe2O6.6 single crystal

The structural, magnetic, electronic, and thermal transport properties of Sr3Fe2O6.6 single crystal were investigated by the room-temperature X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), electrical resistivity ρ(T), specific heat Cp(T), and electron spin resonance (ESR) measurement. The single crystal has been grown by the floating zone method. The as-grown crystal can be indexed by a tetragonal lattice with the space group I4/mmm. The oxygen content determined by the XPS measurement is approximately 6.6, which was verified in the magnetic susceptibility measurement. The incommensurate antiferromagnetic-transition temperature is about TN=62K, and the magnetic susceptibility of the sample were anisotropic. The electrical resistivity ρ(T) shows a semiconducting behavior with an energy gap Eα=0.134eV and non-magnetoresistance behavior. The Cp(T) data exhibits that the Debye temperature ΘD is larger than the theoretical value. The reciprocal of magnetic susceptibility to CW law is verified by the ESR results. The resonance field and the g-factor exhibit anisotropy.