Magnetische Messungen im System Fe?Te

First-order magnetic and structural phase transitions inFe1+ySexTe1−xLi1, Cruz2, Huang3 et al. 2009Phys. Rev. B525343471View full textAdd to dashboardCite

“…The Q value is slightly less than the Q value 0.974Å −1 at the commensurate position (1,0,1) M , which is likely due to the variation of the magnetic form factor as well as a possible variation of the magnetic structure factor. However, one has to be vigilant for impurity phases [34,36]. For example, we can clearly see the strong (1,1,0) cubic Fe impurity peaks in Fig.…”

“…Based on these data, we estimate that the latent heat of the phase transition is ∼215 J/mol, meaning a change of entropy of ∆S ∼ 3.2 J/(mol·K) through the transition. If we assume that the Fe moment in FeTe is about 3.87 µ B in the paramagnetic state [34] and 1.7 µ B below T N , the change of the entropy across the transition based on an Ising model is about 3.5 J/(mol·K). This result suggests that the major contribution to the entropy change at the phase transition arises from the spin ordering, which supports the view that the first order phase transition is driven by the magnetism [35].…”

First-order magnetic and structural phase transitions in Fe$_{1+y}$Se$_x$Te$_{1-x}$

“…The Q value is slightly less than the Q value 0.974 Å−1 at the commensurate position (1,0,1) M , which is likely due to the variation of the magnetic form factor as well as a possible variation of the magnetic structure factor. However, one has to be vigilant for impurity phases [34,36]. For example, we can clearly see the strong (1,1,0) cubic Fe impurity peaks in Fig.…”