Katharina Fritsch

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The interplay between magnetism and crystal structures in three CaFe2As2 samples is studied. For the nonmagnetic quenched crystals, different crystalline domains with varying lattice parameters are found, and three phases (orthorhombic, tetragonal, and collapsed tetragonal) coexist between TS=95 K and 45 K. Annealing of the quenched crystals at 350°C leads(More)
Rasmus Toft-Petersen,1,* Ellen Fogh,2 Takumi Kihara,3 Jens Jensen,4 Katharina Fritsch,1 Jooseop Lee,5 Garrett E. Granroth,6 Matthew B. Stone,5 David Vaknin,7 Hiroyuki Nojiri,3 and Niels Bech Christensen2 1Helmholtz Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany 2Department of Physics, Technical University of Denmark, DK-2880 Kongens(More)
Structural phase transitions in pyrochlore Cd2Nb2O7 were studied by means of single crystal x-ray scattering. On cooling below the ferroelastic transition at T1 = 204 K, the cubic Bragg peaks broaden in a manner consistent with weak orthorhombic distortion. The distortion evolves rather smoothly through the ferroelectric transition at T2 = 196 K, which(More)
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