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Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 101: Correlated Electrons: Other Materials

TT 101.3: Talk

Thursday, March 15, 2018, 16:00–16:15, HFT-FT 101

Thermodynamics and transport properties of oxygen-deficient EuTiO3 — •Johannes Engelmayer1, Christoph Grams1, Xiao Lin1, Kamran Behnia1,2, Joachim Hemberger1, and Thomas Lorenz11II. Physikalisches Institut, Universität zu Köln, Germany — 2Laboratoire Physique et Etude de Matériaux, PSL Research University, 75005 Paris, France

Various perovskite titanates ATiO3 are known to undergo ferroelectric phase transitions, e.g., for A=Ba,Pb,Cd. In contrast, SrTiO3 shows quantum paraelectric behavior, that is, ferroelectric long-range order is suppressed by quantum fluctuations. A partial substitution of Sr with Ca (Sr1−xCaxTiO3) induces ferroelectricity. On the other hand, the insulating SrTiO3 becomes metallic upon electron doping via oxygen deficiencies (SrTiO3−δ) and furthermore shows superconductivity for certain carrier concentrations. If both—Ca and electron doping—is combined (Sr1−xCaxTiO3−δ), even a coexistence of ferroelectricity and superconductivity seems to be possible [1]. EuTiO3 is a promising candidate for comparable phenomena, since Eu2+ and Sr2+ have the same ionic radii, which results in identical structural characteristics. However, Eu2+ has a large magnetic moment of 7µB, in contrast to nonmagnetic Sr2+. Here, we present a detailed investigation of EuTiO3−δ with |δ|≤ 10−2 based on thermodynamic and transport measurements.
C. W. Rischau et al., Nat. Phys. 13, 643 (2017)

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