Magnetic relaxation properties of helium-3 adsorbed on hexagonal boron nitride

被引：17
作者：
Crane, TP [1 ]
Cowan, BP [1 ]
机构：
[1] Univ London Royal Holloway & Bedford New Coll, Millikelvin Lab, Egham TW20 0EX, Surrey, England
来源：
PHYSICAL REVIEW B | 2000年 / 62卷 / 17期
关键词：
D O I：
10.1103/PhysRevB.62.11359
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We present pulse NMR measurements on He-3 adsorbed on hexagonal boron nitride powder in the registered phase. We observe strong coupled magnetic relaxation with substrate B-11 spins, mediated by N-14 surface-layer spins via the level-crossing or quadrupole-dip (QD) effect at 4.5 MHz. rib initio electronic structure calculations of the BN surface-layer electric field gradients, dramatically modified by the He-3 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.
引用
收藏
页码：11359 / 11362
页数：4
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