Multipurpose High Frequency Electron Spin Resonance Spectrometer for Condensed Matter Research

Abstract

We describe a quasi-optical multifrequency ESR spectrometer operating in the 75-225 GHz range and optimized at 210 GHz for general use in condensed matter physics, chemistry and biology. The quasi-optical bridge detects the change of mm wave polarization at the ESR. A controllable reference arm maintains a mm wave bias at the detector. The attained sensitivity of 2x10^10 spin/G/(Hz)1/2, measured on a dilute Mn:MgO sample in a non-resonant probe head at 222.4 GHz and 300 K, is comparable to commercial high sensitive X band spectrometers. The spectrometer has a Fabry-Perot resonator based probe head to measure aqueous solutions, and a probe head to measure magnetic field angular dependence of single crystals. The spectrometer is robust and easy to use and may be operated by undergraduate students. Its performance is demonstrated by examples from various fields of condensed matter physics.

submitted to Journal of Magnetic Resonance

References in corpus (4)

• Gaps and excitations in fullerides with partially filled bands : NMR study of Na2C60 and K4C60
• Spin diffusion and magnetic eigenoscillations confined to single molecular layers in the organic conductors kappa-(BEDT-TTF)_2Cu[N(CN)_2X (X=Cl, Br)
• Microwave frequency modulation in continuous-wave far-infrared ESR utilizing a quasioptical reflection bridge
• Phase segregation on the nanoscale in Na2C60

Cited by in corpus (5)

• Inter-layer spin diffusion and electric conductivity in the organic conductors κ-ET2-Cl and κ-ET2-Br
• Accessing electromagnetic properties of matter with cylindrical vector beams
• Electronic and ionic conductivities in superionic Li${}_4$C${}_{60}$
• Two-dimensional magnetism in kappa-(BEDT-TTF)2Cu[N(CN)2]Cl, a spin-1/2 Heisenberg antiferromagnet with Dzyaloshinskii-Moriya interaction
• Frustration induced one-dimensionality in the isosceles triangular antiferromagnetic lattice of $\delta$-(EDT-TTF-CONMe${}_2$)${}_2$AsF${}_6$