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Dielectric Ceramic EPR Resonators for Low Temperature Spectroscopy at X-band Frequencies

机译：X波段频率下用于低温光谱的介电陶瓷EPR谐振器

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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, 6 K). The DRs with high dielectric constants of about , featuring low residual paramagnetic impurities, have been developed and produced on the basis of barium lanthanide titanates solid solutions with the general formula BaLnTiO (Ln = Sm, Nd) that demonstrate at once low dielectric losses in the microwave range (-14 x 10(-4) at 10 GHz) and appropriate temperature stability of the dielectric constant (5 ppm/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 6 K. The increases of quality and filling factors as well as that of the microwave (mw) -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.
机译：在室温和低温（77，6 K）下研究了用于连续波（cw）X波段电子顺磁共振（EPR）光谱的新型介电陶瓷谐振器（DRs）的性能。在镧系钛酸钡的固态通式为BaLnTiO（Ln = Sm，Nd）的基础上，已经开发并生产了具有大约较高介电常数的DRs，具有少量的顺磁性残留杂质，该DRs立刻表现出较低的介电损耗。微波范围（在10 GHz时为-14 x 10（-4））和适当的介电常数温度稳定性（5 ppm / K）。它们针对小尺寸样品进行了优化，如果通过腔谐振器进行耦合，则可用于商业牛津仪器流动低温恒温器。我们发现在6 K时，最大EPR信号增强高达74倍。根据温度讨论了谐振器设置中质量和填充因子以及微波（mw）场的增加。我们表明，绝对灵敏度增益必须与mw场的增加有关，并且小样本SNR的剩余相对增益约为18。研发的DR具有可靠且易于使用的组件，可在EPR应用中显示出良好的潜力，可用于研究薄膜，尤其是小晶体结构。

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