Temperature dependence of the magnetic susceptibility for , , and FeTe measured in a magnetic field with zero field cooling (ZFC).
Low field magnetic susceptibility in the vicinity of the superconducting transition for single crystals of the two series and .
Magnetization data for some compounds at different temperatures.
Temperature dependence of the host magnetic susceptibility for some compounds. The solid circles correspond to values derived from the high field magnetization data in Fig. 3.
Magnetization data for (a) and FeTe (b) single crystals of the second series (S2) at different temperatures. In inset are the values of the host magnetic susceptibility versus temperature for , derived from its high field magnetization data.
Temperature dependence of the magnetic susceptibility for FeTe (S2) single crystal (a) and its hysteresis behavior (b) in vicinity of the phase transition at .
Total density of states of the paramagnetic FeSe around (solid line) and the partial contribution of the iron -states (dashed line). The Fermi level position (at ) is marked by a vertical line.
Calculated paramagnetic susceptibility of FeSe as a function of the internal lattice parameter . The unit cell volume and ratio are fixed to their experimental ambient pressure values ( and 1.46414). The dashed line is a guide for the eye. The dashed-dotted line corresponds to the experimental .
Calculated paramagnetic susceptibility of FeTe as a function of the internal lattice parameter for LSDA optimized () unit cell volume. The ratio is fixed to the experimental ambient pressure value (1.64714). The dashed line is a guide for the eye.
Superconducting transition temperature (K), FM impurity saturation magnetic moment (emu/mol) and host (intrinsic) magnetic susceptibility at room and zero temperature for compounds.
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