On-Chip ESR Measurements of DPPH at mK Temperatures

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• 作者：Wolfgang Voesch^a ; ^{wolfgang.voesch@pi1.physik.uni-stuttgart.de" class="auth_mail" title="E-mail the corresponding author} ; Markus Thiemann^a ; Daniel Bothner^b ; Martin Dressel^a ; Marc Scheffl^a ; ^{scheffl@pi1.physik.uni-stuttgart.de" class="auth_mail" title="E-mail the corresponding author}
• 关键词：DPPH ; ESR ; EPR ; mK temperatures ; superconducting coplanar resonator
• 刊名：Physics Procedia
• 出版年：2015
• 出版时间：2015
• 年：2015
• 卷：75
• 期：Complete
• 页码：503-510
• 全文大小：358 K

文摘

We study electron spin resonance (ESR) of DPPH at mK temperatures. Here we employ a superconducting coplanar microwave resonator that allows convenient implementation in a dilution refrigerator as well as operation at multiple ESR frequencies, in this case 1.5 GHz, 3.0 GHz, and 4.5 GHz. We find a strong temperature and magnetic field dependence of the ESR of DPPH below 1 K, which is consistent with an antiferromagnetic transition. Our study documents the potential of this on-chip ESR technique for mK experiments and elucidates the possibility to use DPPH as an ESR reference material in this regime.