Continuous-wave far-infrared ESR spectrometer for high-pressure measurements

Bálint Náfrádi, Richárd Gaál, Andrzej Sienkiewicz, T. Fehér, László Forró

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We present a newly-developed microwave probe for performing sensitive high-field/multi-frequency electron spin resonance (ESR) measurements under high hydrostatic pressures. The system consists of a BeCu-made pressure-resistant vessel, which accommodates the investigated sample and a diamond microwave coupling window. The probe's interior is completely filled with a pressure-transmitting fluid. The setup operates in reflection mode and can easily be assembled with a standard oversized microwave circuitry. The probe-head withstands hydrostatic pressures up to 1.6 GPa and interfaces with our home-built quasi-optical high-field ESR facility, operating in a millimeter/submillimeter frequency range of 105-420 GHz and in magnetic fields up to 16 T. The overall performance of the probe was tested, while studying the pressure-induced changes in the spin-relaxation mechanisms of a quasi-1D conducting polymer, KC60. The preliminary measurements revealed that the probe yields similar signal-to-noise ratio to that of commercially available low-frequency ESR spectrometers. Moreover, by observing the conduction electron spin resonance (CESR) linewidth broadening for KC60 in an unprecedented microwave frequency range of 210-420 GHz and in the pressure range of up to 1.6 GPa, we demonstrate that a combination of high-pressure ESR probe and high-field/multi-frequency spectrometer allows us to measure the spin relaxation rates in conducting spin systems, like the quasi-1D conductor, KC60.

Original languageEnglish
Pages (from-to)206-210
Number of pages5
JournalJournal of Magnetic Resonance
Volume195
Issue number2
DOIs
Publication statusPublished - Dec 2008

Fingerprint

Electron Spin Resonance Spectroscopy
pressure measurement
Pressure measurement
continuous radiation
Paramagnetic resonance
Spectrometers
electron paramagnetic resonance
Microwaves
spectrometers
Infrared radiation
Pressure
Hydrostatic Pressure
probes
hydrostatic pressure
Hydrostatic pressure
microwave coupling
frequency ranges
microwave probes
resonance probes
Diamond

Keywords

  • ESR
  • Frequency modulation
  • High-pressure
  • KC
  • Quasi-optical bridge

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Biochemistry
  • Biophysics
  • Condensed Matter Physics

Cite this

Continuous-wave far-infrared ESR spectrometer for high-pressure measurements. / Náfrádi, Bálint; Gaál, Richárd; Sienkiewicz, Andrzej; Fehér, T.; Forró, László.

In: Journal of Magnetic Resonance, Vol. 195, No. 2, 12.2008, p. 206-210.

Research output: Contribution to journalArticle

Náfrádi, Bálint ; Gaál, Richárd ; Sienkiewicz, Andrzej ; Fehér, T. ; Forró, László. / Continuous-wave far-infrared ESR spectrometer for high-pressure measurements. In: Journal of Magnetic Resonance. 2008 ; Vol. 195, No. 2. pp. 206-210.
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