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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 authors reported that the kagome metal CsV$_3$Sb$_5$ is an s-wave superconductor with 2.5$ K and showed that at low temperature, electric field gradient fluctuations diminish and magnetic fluctuations become dominant.
Abstract: We report $^{121/123}$Sb nuclear quadrupole resonance (NQR) and $^{51}$V nuclear magnetic resonance (NMR) measurements on kagome metal CsV$_3$Sb$_5$ with $T_{\rm c}=2.5$ K. Both $^{51}$V NMR spectra and $^{121/123}$Sb NQR spectra split after a charge density wave (CDW) transition, which demonstrates a commensurate CDW state. The coexistence of the high temperature phase and the CDW phase between $91$ K and $94$ K manifests that it is a first order phase transition. At low temperature, electric-field-gradient fluctuations diminish and magnetic fluctuations become dominant. Superconductivity emerges in the charge order state. Knight shift decreases and $1/T_{1}T$ shows a Hebel--Slichter coherence peak just below $T_{\rm c}$, indicating that CsV$_3$Sb$_5$ is an s-wave superconductor.

47 citations

Journal ArticleDOI
TL;DR: In this article, the response of half-integral spin I>1 nuclei in anisotropic systems to the quadrupolar echo (QE) pulse sequence (π/2)x−τ−(π/ 2)y is investigated, with particular emphasis on the effects of quadrupol relaxation.
Abstract: The response, in the frequency domain, of half‐integral spin I>1 nuclei in anisotropic systems to the quadrupolar echo (QE) pulse sequence (π/2)x−τ−(π/2)y is investigated, with particular emphasis on the effects of quadrupolar relaxation. Using a state multipole formalism, we derive the frequency spectra produced by one‐ or two‐dimensional Fourier transformation. Powder samples as well as uniformly and partially oriented samples are considered. The 2D QE experiment produces, in the F1 dimension (Fourier transformation with respect to τ), spectra which provide information about the static quadrupole coupling even if only the central line in the QE spectrum (obtained by Fourier transformation of the induction signal after the echo) is detected. For partially oriented and (incompletely dephased) powder samples, the F1 spectra allow the motional spectral densities to be determined with little or no effect of the inhomogeneous quadrupole coupling, which severely complicates the analysis of conventional (single...

46 citations

Journal ArticleDOI
TL;DR: In this paper, the authors reported the discovery of new superconducting and novel magnetic phases in CeIn 3 on the verge of antiferromagnetism under pressure (P ) through the In-nuclear quadrupole resonance (NQR) measurements.
Abstract: We report the discovery of new superconducting and novel magnetic phases in CeIn 3 on the verge of antiferromagnetism (AFM) under pressure ( P ) through the In-nuclear quadrupole resonance (NQR) measurements. We have found a P -induced phase separation of AFM and paramagnetism (PM) without any trace of a quantum phase transition in CeIn 3 . A new type of superconductivity (SC) was found, under P =2.28–2.5 GPa, to coexist with AFM. It is magnetically separated from PM where the heavy fermion SC takes place. We propose that the magnetic excitations such as spin-density fluctuations induced by the first-order magnetic phase transition might mediate attractive interaction to form Cooper pairs.

46 citations

Journal ArticleDOI
TL;DR: In this article, a spin-locking type sequence (SLS), a phase-alternated pulse sequence (PAPS) and a sequence without a preparatory pulse were used for detecting nuclear quadrupole resonance (NQR) in explosives containing polycrystalline RDX.
Abstract: The multi-pulse method of detecting nuclear quadrupole resonance (NQR) in explosives containing polycrystalline RDX has been investigated. The following sequences were used: a spin-locking type sequence (SLS), a phase-alternated pulse sequence (PAPS) and a sequence without a preparatory pulse. The SLS, PAPS and strong off-resonance comb methods with the same parameters are of great interest for practical applications. The influence of the frequency offset on NQR signals in multi-pulse experiments was studied.

46 citations


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