Note: Commercial SQUID magnetometer-compatible NMR probe and its application for studying a quantum magnet

T Vennemann; M Jeong; D Yoon; A Magrez; H Berger; L Yang; I Živković; P Babkevich; H M Rønnow

doi:10.1063/1.5023675

Note: Commercial SQUID magnetometer-compatible NMR probe and its application for studying a quantum magnet

Rev Sci Instrum. 2018 Apr;89(4):046101. doi: 10.1063/1.5023675.

Authors

T Vennemann¹, M Jeong¹, D Yoon², A Magrez³, H Berger³, L Yang¹, I Živković¹, P Babkevich¹, H M Rønnow¹

Affiliations

¹ Laboratory for Quantum Magnetism, Institute of Physics, Ecole Polytechnique Féderale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
² Laboratory of the Physics of Nanostructured Materials, Institute of Physics, Ecole Polytechnique Féderale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
³ Crystal Growth Facility, Institute of Physics, Ecole Polytechnique Féderale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.

PMID: 29716319
DOI: 10.1063/1.5023675

Abstract

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.