Low-frequency nuclear quadrupole resonance with a dc SQUID

Technical Report · Mon Jul 01 00:00:00 EDT 1991

DOI:https://doi.org/10.2172/5258685· OSTI ID:5258685

Chang, J W

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 Lab., CA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5258685
• Report Number(s): LBL-31124; ON: DE92014506
• Country of Publication: United States
• Language: English

Related Subjects

661210 -- Cryogenics-- (1992-)
665100* -- Nuclear Techniques in Condensed Matter Physics -- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM 27
ALUMINIUM ISOTOPES
ANALYTICAL SOLUTION
BORIC ACID
BORON 11
BORON COMPOUNDS
BORON ISOTOPES
BORON NITRIDES
BORON OXIDES
CHALCOGENIDES
CORUNDUM
ELECTRONIC EQUIPMENT
ELEMENTS
EQUIPMENT
FLUXMETERS
FREQUENCY RANGE
HAMILTONIANS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
ISOTOPES
KHZ RANGE
KHZ RANGE 100-1000
LIGHT NUCLEI
MATHEMATICAL OPERATORS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
MINERALS
NITRIDES
NITROGEN
NITROGEN COMPOUNDS
NONMETALS
NUCLEAR QUADRUPOLE RESONANCE
NUCLEI
ODD-EVEN NUCLEI
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PETALITE
PNICTIDES
QUANTUM OPERATORS
RESONANCE
SAPPHIRE
SILICATE MINERALS
SQUID DEVICES
STABLE ISOTOPES
SUPERCONDUCTING DEVICES
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K