Note: Commercial SQUID magnetometer-compatible NMR probe and its application for studying a quantum magnet.
T VennemannMinki JeongD YoonA MagrezH BergerL YangI ŽivkovićP BabkevichHenrik Moodysson RønnowPublished in: The Review of scientific instruments (2018)
We present a compact nuclear magnetic resonance (NMR) probe which is compatible with a magnet of a commercial superconducting quantum interference device magnetometer and demonstrate its application to the study of a quantum magnet. We employ trimmer chip capacitors to construct an NMR tank circuit for low temperature measurements. Using a magnetic insulator MoOPO4 with S = 1/2 (Mo5+) as an example, we show that the T-dependence of the circuit is weak enough to allow the ligand-ion NMR study of magnetic systems. Our 31P NMR results are compatible with previous bulk susceptibility and neutron scattering experiments and furthermore reveal unconventional spin dynamics.