Pressure-induced metallization of the Mott insulator FeXMn1-XS system

Abramova, G. M.; Hanzawa, A.; Kagayama, T.; Mita, Y.; Eremin, E., V; Zeer, G. M.; Zharkov, S. M.; Ovchinnikov, S. G. Source: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 465 775-779; 10.1016/j.jmmm.2018.05.056 NOV 1 2018

Electrical resistivity of the FeXMn1−XS (0 ≤ X ≤ 0.29) single crystals based on the Mott insulator α-MnS is experimentally studied in the temperature range of 2–300 K at ambient pressure (P = 0) and at high (up to 30 GPa) hydrostatic pressures for x = 0.12. The electron subsystem of FeXMn1−XS undergoes insulator-to-metal transitions indicated by a resistivity drop by a factor of 106 with an increase in the chemical pressure (X) due to the cation substitution under ambient conditions and at the hydrostatic pressure (PC = 27 ± 5 GPa) for x = 0.12. The results obtained show that the hydrostatic pressure - and cation-substitution induced insulator-to-metal transitions in the α-MnS-based Mott compounds have similar mechanisms. The dependence of the critical hydrostatic pressure PC on the Fe content in FeXMn1−XS is established.