Low-frequency nuclear quadrupole resonance with a dc SQUID

Thesis/Dissertation · Mon Jul 01 00:00:00 EDT 1991

DOI:https://doi.org/10.2172/10147735· OSTI ID:10147735

Chang, Jih -Wen ^[1]

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1. Univ. of California, Berkeley, CA (United States)

Conventional pure nuclear quadrupole resonance (NQR) is a technique well suited for the study of very large quadrupolar interactions. Numerous nuclear magnetic resonance (NMR) techniques have been developed for the study of smaller quadrupolar interactions. However, there are many nuclei which have quadrupolar interactions of intermediate strength. Quadrupolar interactions in this region have traditionally been difficult or unfeasible to detect. This work describes the development and application of a SQUID NQR technique which is capable of measuring intermediate strength quadrupolar interactions, in the range of a few hundred kilohertz to several megahertz. In this technique, a dc SQUID (Superconducting QUantum Interference Device) is used to monitor the longitudinal sample magnetization, as opposed to the transverse magnetization, as a rf field is swept in frequency. This allows the detection of low-frequency nuclear quadrupole resonances over a very wide frequency range with high sensitivity. The theory of this NQR technique is discussed and a description of the dc SQUID system is given. In the following chapters, the spectrometer is discussed along with its application to the study of samples containing half-odd-integer spin quadrupolar nuclei, in particular boron-11 and aluminum-27. The feasibility of applying this NQR technique in the study of samples containing integer spin nuclei is discussed in the last chapter. 140 refs., 46 figs., 6 tabs.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 10147735
• Report Number(s): LBL--31124; ON: DE92014506
• Country of Publication: United States
• Language: English

Related Subjects

661210
665100
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM 27
ANALYTICAL SOLUTION
BORIC ACID
BORON 11
BORON NITRIDES
BORON OXIDES
CRYOGENICS
HAMILTONIANS
KHZ RANGE 100-1000
NITROGEN
NUCLEAR QUADRUPOLE RESONANCE
NUCLEAR TECHNIQUES IN CONDENSED MATTER PHYSICS
PETALITE
SAPPHIRE
SQUID DEVICES
TEMPERATURE RANGE 0000-0013 K