Metallic transition of the colossal magnetoresistance material Fe (x) Mn1-x S (x=0.18) under high pressure
Mita Y., Kagayama T., Abramova G. M.), Petrakovskii G. A., Sokolov V. V. Metallic transition of the colossal magnetoresistance material Fe (x) Mn1-x S (x=0.18) under high pressure // JOURNAL OF THE KOREAN PHYSICAL SOCIETY Volume: 63 Issue: 3 Pages: 325-328 Published: AUG 2013
Abstract: A pressure-induced phase transition in the colossal magnetoresistance (CMR) material Fe0.18Mn0.82S was studied by using infrared (IR) reflection and X-ray diffraction (XRD) at pressures up to 40 GPa at room temperature. XRD shows that the crystal structure of this sample is a NaCl-type structure at ambient pressure, that a structural change starts around 17 GPa, and that a mixed phase mixed between the NaCl-type low-pressure phase and an unknown structure high pressure phase continues up to around 25 GPa. On the other hand, the IR reflectivity increases with increasing pressure from 15 GPa and becomes remarkably high around 20 GPa. The spectra do not show any changes from 30 GPa. From these results, we conclude that the phase transition of Fe0.18Mn0.82S at room temperature starts around 15 GPa and is completed around 30 GPa and that the high-pressure phase is not a band-overlapping semimetal but a true metal.