[Back]

M. Bartashevits, T. Goto, T. Tomita, N. Baranov, S. Zemlyanski, G. Hilscher, H. Michor:
"AF-FRI metamagnetic transition in itinerant Mn_2-xCo_xSb: high-field and high pressure effects";
Physica, B 318 (2002), 198 - 210.

The magnetization of Mn2 xCoxSbsystem with 0pxp0:35 has been measured under high magnetic fields up to
100 T and high pressure up to 12 kbar: Mn2Sbis a ferrimagnet and substitution of Co for Mn at 0:18pxp0:35 results
in the appearance of the spontaneous first-order magnetic phase transition from ferrimagnetic (FRI) to
antiferromagnetic (AF) state at T ¼ Tt with decreasing temperature at a critical Co concentration. Below Tt a firstorder
field-induced AF-FRI transition is observed at a critical field Bc: The critical field Bc is found to decrease with
increasing pressure applied at T ¼ 4:2 K: The AF state which appeared for the compound with the critical
concentration x ¼ 0:18 can be transformed to the FRI one by the application of the high pressure of about 16 kbar by
increasing the amount of FRI phase. Using the experimental data, the magnetic phase diagrams Bc-T-x and Bc-p-x
are determined. The observed magnetic properties and magnetic phase diagrams of Mn2 xCoxSbare explained by the
itinerant magnetism of d-electrons and by peculiarities of electronic structure. The itinerant nature of AF-FRI
transition is confirmed by specific heat measurements in AF- and field-induced FRI states.

http://dx.doi.org/10.1016/S0921-4526(01)01471-5