caa a22 4500 605545170 CHVBK 20210128100934.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s00723-014-0611-x doi (NATIONALLICENCE)springer-10.1007/s00723-014-0611-x Dielectric Ceramic EPR Resonators for Low Temperature Spectroscopy at X-band Frequencies [Elektronische Daten] [Stefan Friedländer, Oleg Ovchar, Horst Voigt, Rolf Böttcher, Anatolii Belous, Andreas Pöppl] The performance of new dielectric ceramic resonators (DRs) for continuous wave (cw) X-band electron paramagnetic resonance (EPR) spectroscopy is investigated at room temperature and low temperatures (77, 6K). The DRs with high dielectric constants of about $$\varepsilon _r = 80$$ ε r = 80 , featuring low residual paramagnetic impurities, have been developed and produced on the basis of barium lanthanide titanates solid solutions with the general formula Ba $$_{6-x}$$ 6 - x Ln $$_{8+2x/3}$$ 8 + 2 x / 3 Ti $$_{18}$$ 18 O $$_{54}$$ 54 (Ln=Sm, Nd) that demonstrate at once low dielectric losses in the microwave range ( $$\tan \delta = 7$$ tan δ = 7 -14×10−4 at 10GHz) and appropriate temperature stability of the dielectric constant ( $$\tau _\varepsilon = \pm$$ τ ε = ± 5ppm/K). They were optimized for samples with small dimensions and can be used in commercial Oxford instruments flow cryostats if the coupling is done via cavity resonators. We found a maximal EPR signal enhancement by a factor up to 74 at 6K. The increases of quality and filling factors as well as that of the microwave (mw) $$B_1$$ B 1 -field in the resonator setup are discussed in dependence on temperature. We show that the absolute sensitivity gain must be related to that increase in the mw field and the remaining relative gain of the SNR is about 18 for small samples. The developed DRs have shown a good potential in EPR application as reliable and easy-to-use components allowing research of thin films and in particular small crystalline structures. Springer-Verlag Wien, 2014 Friedländer Stefan Institute of Experimental Physics II, Leipzig University, Linnéstrasse 5, 04103, Leipzig, Germany aut Ovchar Oleg Institute of General and Inorganic Chemistry, NASU, Academian Palladin Avenue 32-34, 03680, Kiev, Ukraine aut Voigt Horst Institute of Experimental Physics II, Leipzig University, Linnéstrasse 5, 04103, Leipzig, Germany aut Böttcher Rolf Institute of Experimental Physics II, Leipzig University, Linnéstrasse 5, 04103, Leipzig, Germany aut Belous Anatolii Institute of General and Inorganic Chemistry, NASU, Academian Palladin Avenue 32-34, 03680, Kiev, Ukraine aut Pöppl Andreas Institute of Experimental Physics II, Leipzig University, Linnéstrasse 5, 04103, Leipzig, Germany aut Applied Magnetic Resonance Springer Vienna 46/1(2015-01-01), 33-48 0937-9347 46:1<33 2015 46 723 https://doi.org/10.1007/s00723-014-0611-x text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00723-014-0611-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Friedländer Stefan Institute of Experimental Physics II, Leipzig University, Linnéstrasse 5, 04103, Leipzig, Germany aut NATIONALLICENCE 700 1- Ovchar Oleg Institute of General and Inorganic Chemistry, NASU, Academian Palladin Avenue 32-34, 03680, Kiev, Ukraine aut NATIONALLICENCE 700 1- Voigt Horst Institute of Experimental Physics II, Leipzig University, Linnéstrasse 5, 04103, Leipzig, Germany aut NATIONALLICENCE 700 1- Böttcher Rolf Institute of Experimental Physics II, Leipzig University, Linnéstrasse 5, 04103, Leipzig, Germany aut NATIONALLICENCE 700 1- Belous Anatolii Institute of General and Inorganic Chemistry, NASU, Academian Palladin Avenue 32-34, 03680, Kiev, Ukraine aut NATIONALLICENCE 700 1- Pöppl Andreas Institute of Experimental Physics II, Leipzig University, Linnéstrasse 5, 04103, Leipzig, Germany aut NATIONALLICENCE 773 0- Applied Magnetic Resonance Springer Vienna 46/1(2015-01-01), 33-48 0937-9347 46:1<33 2015 46 723