Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 86: Low-Dimensional Systems: Charge Order

TT 86.3: Vortrag

Freitag, 24. März 2017, 11:45–12:00, HSZ 103

Pressure dependent x-ray diffraction study of the electronic order in IrTe₂ — •Maximilian Kusch^1,2, Tobias Ritschel², Jan Trinckauf¹, Gaston Garbarino³, Sang-Wook Cheong⁴, and Jochen Geck² — ¹Institute for Solid State and Materials Research, Helmholtzstrasse 20, 01069 Dresden, Germany — ²Institut für Strukturphysik, Technische Universität Dresden D-01062 Dresden, Germany — ³European Synchrotron Radiation Facility, B.P.220, 38043 Grenoble, France — ⁴Department of Physics and Astronomy Rutgers, The State University of New Jersey 136 Frelinghuysen Road Piscataway, NJ 08854-8019 USA

The proximity of spatial electronic order and superconductivity in the transition metal dichalcogenides (TMDs) currently attracts a lot of interest. At ambient pressure, also pristine IrTe2 exhibits electronic order below T_s≈ 250 K and becomes superconducting upon doping with Pd and Pt, although it remains unclear whether this transition is similar to other TMDs. In addition, contrary to other TMDs, measurements of the electrical resistivity indicate a stabilization of the electronic order accompanied by a suppression of the superconducting phase. In order to clarify the underlying physics we performed pressure dependent single crystal XRD measurements up to 42 GPa on IrTe₂ and its Pd (4%) and Pt (7%) doped variants. Our data reveal two transitions in IrTe₂ upon increasing pressure, where the first one is identified by surprisingly strong superlattice reflections, whereas the second one is better described by a transformation into a completely new crystal structure with a large unit cell.