Topic
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.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, the superconducting characteristics of the heavy-fermion superconductor CeCoIn 5 via nuclear-quadrupole-resonance (NQR) measurement under pressure (P ).
Abstract: We report the systematic evolution of the superconducting (SC) characteristics of the heavy-fermion (HF) superconductor CeCoIn 5 via nuclear-quadrupole-resonance (NQR) measurement under pressure ( P ). The application of P significantly suppresses the nuclear spin–lattice relaxation rate 1/ T 1 that is dominated by antiferromagnetic (AFM) spin fluctuations (SFs) specific to a quantum critical point (QCP). It is demonstrated that the marked suppression of AFM SFs leads to a reduction in the SC energy gap or in the coupling strength of the Cooper pair. T c , nevertheless, increases with increasing P due to the increase in HF bandwidth. This is expected to make the lifetime of quasi-particles sufficiently long.
53 citations
53 citations
TL;DR: Using nuclear double resonance techniques, the nuclear quadrupole resonance of deuterium in both HDO and D2O molecules in isotopically enriched hexagonal ice at 77 K has been measured.
53 citations
TL;DR: In this paper, the Fourier transform zero-field NMR and NQR (Fourier transform NMR) was used to measure nuclear spin evolution as a function of time.
Abstract: In comparison to high‐field NMR, zero‐field techniques offer advantages in terms of spectral interpretability in studies of polycrystalline or amorphous solids. This article describes a technique and apparatus for time‐domain measurements of nuclear magnetism in the absence of applied fields (Fourier transform zero‐field NMR and NQR). Magnetic field cycling and high field detection are employed to enhance sensitivity. The field cycling is accomplished with an air‐driven shuttle system which moves the sample between regions of high and low magnetic field, in combination with switchable electromagnets in the low‐field region. Sudden field steps or pulses are used to initiate coherent nuclear spin evolution in zero field and to monitor such evolution as a function of time. Experimental results are shown and analyzed. Possible variations on the basic method are described and their relative advantages are discussed.
52 citations
TL;DR: Spontaneous oxygen loss was found to degrade the sharp NMR spectrum of the Cu(1) site and Spin-lattice relaxation rates reveal strikingly different electron dynamics for the two sites.
Abstract: Nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) studies of copper nuclei are reported for high-quality single-phase powder samples of Ba/sub 2/YCu/sub 3/O/sub 7-//sub delta/. The high-field /sup 63/Cu NMR spectrum shows well-defined axial symmetry for the chain-forming Cu(1) site and evidence of appreciable disorder in the Cu(2) planes. Spontaneous oxygen loss was found to degrade the sharp NMR spectrum of the Cu(1) site. Spin-lattice relaxation rates reveal strikingly different electron dynamics for the two sites. For neither site do the rates exhibit conventional Bardeen-Cooper-Schrieffer behavior near T/sub c/.
52 citations