Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 54: Correlated Electrons: Complex Oxides and Other Materials
TT 54.2: Vortrag
Donnerstag, 4. April 2019, 09:45–10:00, H22
Fluctuation regime based on dimer correlations in a novel s=1/2 spin chain compound with (IO3)− as stereochemically active lone pair group — Eleni Mitoudi-Vagourdi1, Vladimir Gnezdilov2,3, Dirk Wulferding2,4, •Peter Lemmens2,4, Karina V. Lamonova5, Yurii Pashkevich5, Reinhard Kremer6, and Mats Johnsson1 — 1Dept. of Chem., Stockholm Univ., Stockholm, Sweden — 2IPKM, TU-BS, Braunschweig, Germany — 3ILTPE, Kharkov, Ukraine — 4LENA, TU-BS, Braunschweig, Germany — 5Galkin DonFTI, Kyiv, Ukraine — 6MPI-FKF, Stuttgart, Germany
The novel iodate KCu(IO3)3 contains spin chains formed by [CuO6] octahedra, corner sharing with [IO3] groups. This leads to an oxygen plane around each Cu ion and two apical oxygens with larger Cu-O distances along chains. The resulting Cu binding potential is rather soft and allows pronounced fluctuations. Based on thermodynamic and Raman scattering data we give evidence for Cu dimer fluctuations, their commensurate lock-in, and long range ordering with a sequence of characteristic temperatures, TN = 1.3K < TJT = 175K < T* = 200K.
Work supported by QUANOMET NL-4, DFG LE967/16-1, and NTH Contacs in Nanosystems.