Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 23: Superconductivity: Fe-based Superconductors - Fe(Se/Te)
TT 23.4: Vortrag
Mittwoch, 28. März 2012, 10:15–10:30, H 2053
Magneto-structural investigations on Fe1+x(Te1−ySey) single crystals — •Mathias Doerr1, Wolfram Lorenz1, Dona Cherian2, Sahana Rößler3, Steffen Wirth3, Philipp Materne1, and Michael Loewenhaupt1 — 1Technische Universität Dresden, Institut für Festkörperphysik, D-01062 Dresden, Germany — 2Dept. of Physics, Indian Inst. of Science, Bangalore-560012, India. — 3Max-Planck-Institut für Chemische Physik fester Stoffe, D-01187 Dresden, Germany
The class of Fe1+x(Te1−ySey) compounds is the counterpart of Fe-pnictides, special effects as magnetic order or superconductivity are found. A special topic is the interplay of magnetic and lattice properties which is crucial for a number of correlation phenomena. Thermal expansion and isothermal magnetostriction was measured on Fe1+xTe (x = 0, 0.06, 0.13) and compared to other experiments and model concepts. As one fact, it is shown that magnetic order exists independently of lattice distortions, already at higher temperatures than the latter ones. Moreover, strong thermal hysteresis effects occur. This behaviour differs from that of the Fe-pnictides and therefore, microscopic mechanisms (as for example magnetic fluctuations) should stay a matter of particular interest.