Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Poster Session: Correlated Electrons
TT 72.49: Poster
Mittwoch, 14. März 2018, 15:00–19:00, Poster B
Electron spin resonance studies on the frustrated tripod-Kagome material Mg2Gd3Sb3O14 — •Christoph Wellm1,2, Julian Zeisner1,2, Mihai Sturza2, Bernd Büchner1,2, and Vladislav Kataev1 — 1Leibniz Institute for Solid State and Materials Research IFW Dresden, D-01171 — 2Institut für Festkörper-und Materialphysik, TU Dresden, D-01062
As an example of a class of geometrically frustrated magnetic systems, the so-called tripod Kagome materials consisting of a modified pyrochlore lattice with nonmagnetic interlayers have been suggested as an interesting target of experimental investigation. Since the Kagome planes in these compounds are well separated from each other, two-dimensional magnetic behavior is expected. In our work we performed high-field electron spin resonance measurements on a powder sample of Mg2Gd3Sb3O14, a representative of a classical Heisenberg magnet, in which the magnetic Gd3+ centres are devoid of spin-orbit coupling. Measurements were conducted over a frequency range of 70-420 GHz and temperatures ranging from 3-50 K. The Gaussian shape of the spectra is consistent with a model where dipolar spin-spin interaction plays a dominant role, while the growing asymmetry of the lineshape upon decrease of temperature signifies an effective internal field building up, an indication of increasing short-range spin-spin-correlations. Furthermore, temperature dependent critical broadening of the linewidth and increase of the internal field strength provide insights into the dimensionality of the spin-spin correlations.