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We have made a crossed coil setup (X and Y transmit/receiving coils) with a SQUID pick up loop along Z.

Now we want to see EPR or NMR lines, probably using it in a CW fashion, ie. putting a ramp + lock-in oscillation in X, a CW excitation frequency in Y and demodulating the SQUID signal in Z.

Question is: What sample will give us nice, narrow, distinguishable lines at 4°K?.

Note: we can only go up to 10 mT with the X coil. Liquid $^3$He is off our budget.

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    $\begingroup$ Come on, homework? You should be able to propose a few, and make educated guesses at their linewidth! $\endgroup$ – Karl Jul 8 at 22:31
  • $\begingroup$ @ Karl, I'm a physicist... I dont know many commonly used EPR samples. If its worth anything, we did try teflon NMR and copper sulfate EPR and they both failed. $\endgroup$ – Gyromagnetic Jul 9 at 5:35
  • $\begingroup$ A search using g-standard and/or single line epr might help. In the worse case O am pretty sure you can ask an author and you will get advice in minutes. $\endgroup$ – Alchimista Jul 9 at 11:19
  • $\begingroup$ I'm amazed someone gave you access to LHe cryogenic equipment for this. Have you tried if your EPR works at room temperature? Btw. the abbreviation "EPR" and "CW fashion" don't fit. $\endgroup$ – Karl Jul 9 at 19:09
  • $\begingroup$ I'm amazed someone gave you access to LHe cryogenic equipment for this.- It actually belongs to me, I use cryogens on a daily basis so I wouldn't be so amazed. Btw. the abbreviation "EPR" and "CW fashion" don't fit. - How about "Continuous Wave EPR" as contrast to "Pulsed EPR"? $\endgroup$ – Gyromagnetic Jul 10 at 6:48

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