Electronic properties of single-crystallineFe1.05TeandFe1.03S

Effect of Fe excess on structural, magnetic and superconducting properties of single-crystalline Fe1+xTe1−ySey

“…For all studied compositions, the effective moment µ e f f is of the order of 4 µ B . For the pure Fe 1+x Te compound (actual composition Fe 1.087 Te), a sharp step in the susceptibility is measured at T N =67 which marks the magneto-structural transition [10,14,15,20]. When 10% Se substitutes for Te, the high temperature behavior of the susceptibility does not change, but the transition temperatures shifts down to 46 K. Upon increasing the Se-doping, the magneto-structural transition is suppressed (see Fig.…”

“…A systematic investigation of structural, magnetic, and superconducting properties as a function of both the Se-and Fe-content is mandatory, and is the aim of the present work. Single crystals of Fe 1+x Te 1−y Se y have been recently grown by several authors [15,16,20,21,22] and the role of excess Fe in increasing the charge localization has been recognized [16]. However, little attention has been paid to the actual Fe and Se doping levels in a more realistic 3-D phase diagram, and how different ground states can be driven by Fe and Se doping is not yet understood.…”

Phonon, two-magnon, and electronic Raman scattering of Fe1+yTe1−xSeOkazaki1, Sugai2, Niitaka3 et al. 2011Phys. Rev. B

“…38 On the other hand, SDW gap has not been observed in σ(ω) of Fe 1.05 Te. 39 However, σ(ω) of Fe 1.05 Te shows a prominent temperature dependence below 500 cm −1 below T S . The edge structure around 300-800 cm −1 in the Raman spectra of Fe 1.074 Te also should be related to the magnetic transition.…”

Intensity-dependent interference effect in high-order harmonic generation from alignedH2 +molecules

“…In our treatment, the dependence of the interference minimum on the laser intensity is a consequence of energy conservation in HHG process. In the related treatments based on the three-step model, some contributions exhibit such a dependence in the HHG spectrum [19,29], while others do not [9,12]. According to our study, if the intensity of the driving laser field varies in a wide range, such as few-cycle laser pulses, and the harmonics were generated at various laser intensities, then the interference minimum may appear at different harmonic orders.…”

“…Recently, Smirnova et al [18] observed that the location of the interference minimum shifts linearly with laser intensity. Although the influence of laser intensity on the molecular HHG was studied numerically [19], the physical mechanism is far from unequivocal.…”