Effect of Rabi splitting on the low-temperature electron paramagnetic resonance signal of anthracite
| Autor: | Krzysztof Tadyszak, S. A. Markevich, R. Fedaruk, M.A. Augustyniak-Jabłokow, Roman Strzelczyk |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Nuclear and High Energy Physics Condensed matter physics Spins Chemistry Pulsed EPR Biophysics Anthracite 02 engineering and technology Electron Atmospheric temperature range 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Biochemistry law.invention law 0103 physical sciences Strong coupling Atomic physics 0210 nano-technology Electron paramagnetic resonance Saturation (magnetic) |
| Zdroj: | Journal of Magnetic Resonance. 274:73-79 |
| ISSN: | 1090-7807 |
| Popis: | Specific distortions of the EPR signal of bulk anthracite are observed at low temperatures. They are accompanied by variations in the microwave oscillator frequency and are explained by the manifestation of the Rabi splitting due to the strong coupling between electron spins and the cavity, combined with the use of an automatic frequency-control (AFC) system. EPR signals are recorded at negligible saturation in the temperature range of 4-300K with use of the AFC system to keep the oscillator frequency locked to the resonant frequency of the TM110 cylinder cavity loaded with the sample. For the sample with a mass of 3.6mg the line distortions are observed below 50K and increase with temperature lowering. The oscillator frequency variations are used to estimate the coupling strength as well as the number of spins in the sample. It is shown that the spin-cavity coupling strength is inversely proportional to temperature and can be used for the absolute determination of the number of spins in a sample. Our results indicate that at low temperatures even 1016 spins of the anthracite sample, with a mass of about 0.5mg, can distort the EPR line. |
| Databáze: | OpenAIRE |
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