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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 Fe_1+x(Te_1−ySe_y) 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 Fe_1+x(Te_1−ySe_y) 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 Fe_1+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.