2000/11/01 by Tom Crane, Brian Cowan · 1 citation
Chemistry · Physics and Astronomy · #Advanced NMR Techniques and Applications #Atomic and Subatomic Physics Research #Rare-earth and actinide compounds
paper · doi:10.1103/physrevb.62.11359
openalex publication_date 2000/11/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/26
We present pulse NMR measurements on 3He adsorbed on hexagonal boron nitride powder in the registered phase. We observe strong coupled magnetic relaxation with substrate 11B spins, mediated by 14N surface-layer spins via the level-crossing or quadrupole-dip (QD) effect at 4.5 MHz. Ab initio electronic structure calculations of the BN surface-layer electric field gradients, dramatically modified by the 3He were essential in justifying our QD explanation. BN crystallite geometry plays a key role in producing the QD. Stretched exponential fits to the QD relaxation data may provide a new tool for studying specifically the commensurate phases on BN and related materials.