Effect of Pressure on the Isomer Shift ofFe57in the bcc Phase

Search for magnetism in hcp ε-Fe

“…Our results for the pressure dependence (at 300 K) of the isomer shift for a-Fe are in reasonable agreement with previously published values(S, 11,12,15). Our measurements also show a linear change of the isomer shift as a function of pressure; the slope is Evidence for the presence of €-phase in the Fe sample was observed first at a pressure of 11.9 GPa.…”

“…The hyperfine splitting of the ME spectra of a-Fe has been observed by various authors (11)(12)(13)(14) to decrease linearly as a function of pressure. We also observe a linear decrease in the internal magnetic field of a-Fe with increasing pressure; however, we find a slope ain H/dP = (-3.15 + 0.09) x 10-3 GPa-l significantly higher th~n has been found previously.…”

An investigation of CoSn using Mössbauer Spectroscopy

“…The differences in interatomic distances is thus rather small. The influence on the isomer shift can however be estimated, using the experimental dependence of hydrostatic pressure on the isomer shift for iron metal [8] Ad = + 1.38( 22 and the unit cell volume change, when going from FeSn to CoSn. A decrease of -0.07(1) mm/s for the isomer shift is then expected, while the experimental decrease is 0.05(2) mmjs.…”

Stability of Ferromagnetism in Fe, Co, and Ni Metals under High Pressure with GGA and GGA+U

“…Based on the results of Mössbauer spectroscopy [7,8] and X-ray emission spectroscopy [9], hcp Fe is confirmed to be nonmagnetic. Mathon et al [10,11] have investigated the relationship between the structural change and magnetic transition in detail using X-ray absorption and X-ray magnetic circular dichroism (XMCD), and they concluded that the magnetic transition occurs ahead of the structural change and this can be attributed to the instability of the ferromagnetic (FM) state in bcc Fe with increasing pressure.…”