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Nuclear quadrupole resonance

About: Nuclear quadrupole resonance is a research topic. Over the lifetime, 3531 publications have been published within this topic receiving 38801 citations. The topic is also known as: Nuclear quadrupole resonance spectroscopy & NQR.


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Journal ArticleDOI
TL;DR: In this article, the bulk magnetic susceptibility and 93Nb nuclear quadrupole resonance (NQR) in the Pr-based caged compound PrNb2Al20 were analyzed and the results showed that no symmetry-breaking magnetic dipole order occurs down to 75 mK. The frequency dependence of 1/T1 is attributed to the magnetic fluctuation due to the hyperfineenhanced 141Pr nuclear moment inherent in the nonmagnetic Γ3 CEF ground state.
Abstract: We report measurements of bulk magnetic susceptibility and 93Nb nuclear quadrupole resonance (NQR) in the Pr-based caged compound PrNb2Al20. By analyzing the magnetic susceptibility and magnetization, the crystal electric field (CEF) level scheme of PrNb2Al20 is determined to be Γ3(0 K)–Γ4(21.32 K)–Γ5(43.98 K)–Γ1(51.16 K) within the framework of the localized 4f electron picture. The 93Nb-NQR spectra exhibit neither spectral broadening nor spectral shift upon cooling down to 75 mK. The 93Nb-NQR spin–lattice relaxation rate 1/T1 at 5 K depends on the frequency and remains almost constant below 5 K. The frequency dependence of 1/T1 is attributed to the magnetic fluctuation due to the hyperfine-enhanced 141Pr nuclear moment inherent in the nonmagnetic Γ3 CEF ground state. The present NQR results provide evidence that no symmetry-breaking magnetic dipole order occurs down to 75 mK. Also, considering an invariant form of the quadrupole and octupole couplings between a 93Nb nucleus and Pr 4f electrons, Pr 4f qu...

13 citations

Journal ArticleDOI
TL;DR: In this paper, a review of results obtained from magnetic resonance experiments has been presented, which supports the picture of a crossover from displacive to order-disorder behavior and the subsequent development of precursor dynamic clusters in perovskite and antifluorite crystals undergoing rotational phase transitions.

13 citations

Journal ArticleDOI
TL;DR: Two multichannel detectors are developed to counter the typically present radio frequency interference andumerical simulations indicate that the proposed methods offers a significantly improved robustness to uncertainties in the parameters detailing the examined sample.
Abstract: Nuclear quadrupole resonance (NQR) offers an unequivocal method of detecting hidden narcotics and explosives. Unfortunately, the practical use of NQR is restricted by the low signal-to-noise ratio (SNR) and means to improve the SNR are vital to enable a rapid, reliable and convenient system. In this correspondence, we develop two multichannel detectors to counter the typically present radio frequency interference. Numerical simulations indicate that the proposed methods offers a significantly improved robustness to uncertainties in the parameters detailing the examined sample.

13 citations

Journal ArticleDOI
TL;DR: The pulsed nuclear quadrupole resonance method was used to search for the NQR frequencies of (14)N in methamphetamine hydrochloride based on quantum chemical estimates to investigate the temperature dependences of the N QR frequencies and relaxation properties for stand-off sensing of illicit drugs.

13 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202320
202237
202116
202036
201928
201829