Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 47: Superconductivity: Properties and Electronic Structure 2
TT 47.2: Vortrag
Mittwoch, 22. März 2017, 15:30–15:45, HSZ 103
Thermodynamic and Raman study of untwinned
La1.8−xEu0.2SrxCuO4 single crystals — •Julia Martius1, Liran Wang1, Peter Adelmann1, Michael Merz1, Frédéric Hardy1, Mingquan He1, Matteo Minola2, Tomohioro Takayama2, Hidenori Takagi2, Christoph Meingast1, and Matthieu Le Tacon1 — 1Institute for Solid-State Physics, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany. — 2Max-Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart Germany.
Partial substitution of La by Eu in La2−xSrxCuO4 leads to a stabilization of a low-temperature-tetragonal (LTT) phase, in which superconductivity is strongly suppressed at a doping of x = 1/8 [1]. This suppression has been attributed to long-range charge and magnetic ordering, which in La1.8−xEu0.2SrxCuO4 have been reported to occur at around 80 K and 30 K, respectively, i.e. well below the LTT transition at 130 K [2]. In this study we have looked for thermodynamic signatures of these ordering phenomena in high-quality untwinned single crystals using high-resolution thermal-expansion, specific-heat and magnetization measurements. The thermodynamic data are supplemented by electronic Raman measurements.
[1] B. Büchner et al., Phys. Rev. Lett. 73, 1841 (1994).
[2] J. Fink et al., Phys. Rev. B 83, 092053 (2011).