Electron Magnetic Resonance.

Description:

Electron Magnetic Resonance (EMR)  covers a variety of magnetic resonance techniques associated with the electron. The most popular of those techniques is Electron Paramagnetic/Spin Resonance (EPR/ESR).

In our lab, EMR experiments can be performed in pulsed magnetic fields up to 70 T using a transmission-probe multi-frequency spectrometer operated in the  0.1 – 9 THz frequency range,  covered by (i)  VDI  microwave chains  (product of Virginia Diodes Inc.), (ii) FIRL-100 THz molecular-gas  laser (product of Edinburgh Instruments Ltd), and (iii) the FELBE THz  free-electron laser.  The spectrometer is equipped with Ga:Ge and n-InSb bolometers. The lowest temperature available for EMR experiments is 1.5 K.
FEATURES DRESDEN
Local Contact

Sergei Zvyagin
Field range up to 70 T
Temperature range down to 1.5 K
Available frequency ranges 0.1 – 9 THz
Sources VDI microwave chains (0.1-0.5 THz), THz molecular-gas laser (0.4-3.5 THz), THz free-electron laser (1.2 – 9 THz)
Sample size Ca 4x4x1 mm
Sample holder Faraday configuration
Sample environment He4 bath cryostat
Typical experiment
Frequency-field diagram of ESR excitations in the quasi-1D chain material Cu-PM with staggered DM interaction taken in magnetic fields up to 64 T at 1.5 K (left panel) [4]. Corresponding examples of ESR spectra (right panel).
Measurement examples 1. M. Ozerov et al., Phys. Rev. B 92, 241113 (R) (2015)
2. F. Esser et al., Appl. Phys. Lett. 107, 062103 (2015)
3. M. Ozerov et al., Phys. Rev. Let. 113, 157205 (2014)
4. S.A. Zvyagin et al., Phys. Rev. B 83, 060409(R) (2011)
5. O. Drachenko et al., Phys. Rev. B 79, 073301 (2009)
6. S.A. Zvyagin et al., Rev. Sci. Instr. 80, 073102 (2009)
local contact: S. Zvyagin