Dresden 2009 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 32: Postersession Superconductivity: Josephson Junctions, SQUIDs, Heterostructures, Andreev Scattering, Vortex Physics, Cryodetectors, Measuring Devices, Cryotechnique

TT 32.31: Poster

Mittwoch, 25. März 2009, 14:00–18:00, P1A

THz-range free-electron laser ESR spectroscopy: techniques and applications in high magnetic fields — •Mykhaylo Ozerov, E. Čižmár, D. Kamenskyi, S. Zherlitsyn, T. Herrmannsdörfer, J. Wosnitza, and S.A. Zvyagin — Hochfeld-Magnetlabor Dresden (HLD), Forschungszentrum Dresden - Rossendorf (FZD), Dresden, Germany

The successful use of picosecond-pulse free-electron-laser (FEL) radiation for the continuous-wave THz-range electron spin resonance (ESR) spectroscopy has been demonstrated. The unique combination of two linac-based FELs (covering the wavelength range of 4 - 250 µm) with high magnetic fields at the Research Center Dresden-Rossendorf (FZD) allows for tunable-frequency ESR spectroscopy in an extraordinary broad frequency range of 1.2 - 75 THz in magnetic fields up to ∼ 70 T. The new approach is of particular importance for studying magnetic excitations in materials exhibiting field-induced phenomena (including magnetic phase transitions) and in spin systems with a large zero-field splitting. The performance of the spectrometer is illustrated with ESR spectra obtained in the low-dimensional organic material (C₆H₉N₂)CuCl₃ and the multiferroic compound YMnO₃

This work was made in collaboration with R. Wünsch, W. Seidel, H.D. Zhou, C. Wiebe.