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.
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TL;DR: In this paper, the nitrogen-14 nuclear quadrupole resonance spectrum of the potassium salt of 7, 7′, 8, 8′tetracyanoquinodimethan (K-TCNQ) as found at liquid nitrogen temperature is presented.
24 citations
TL;DR: In this paper, the superconductivity of CaFe2As2 was investigated under pressure in the range 4.7 and 10.8 kbar, and it was shown that electron correlations play a vital role in forming Cooper pairs in this compound.
Abstract: 75As-zero-field nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements are performed on CaFe2As2 under pressure. At P = 4.7 and 10.8 kbar, the temperature dependencies of nuclear-spin-lattice relaxation rate (1/T1) measured in the tetragonal phase show no coherence peak just below Tc(P) and decrease with decreasing temperature. The superconductivity is gapless at P = 4.7 kbar but evolves to that with multiple gaps at P = 10.8 kbar. We find that the superconductivity appears near a quantum critical point under pressures in the range 4.7 kbar ≤ P ≤ 10.8 kbar. Both electron correlation and superconductivity disappear in the collapsed tetragonal phase. A systematic study under pressure indicates that electron correlations play a vital role in forming Cooper pairs in this compound.
24 citations
TL;DR: The 35Cl nuclear quadrupole resonance frequencies in some 22 compounds of the type L2MCl2(M = NiII, PdII, or PtII) have been detected and discussed in terms of the electronic structure of the complex.
Abstract: The 35Cl nuclear quadrupole resonance frequencies in some 22 compounds of the type L2MCl2(M = NiII, PdII, or PtII have been detected and are discussed in terms of the electronic structure of the complex. In trans-L2PdCl2 complexes, the 35Cl frequencies appear to depend on the electron-donor power of the ligand L. The 35Cl resonance signals in three trans-L2PtCl2 complexes are found at higher frequencies than in the corresponding cis-complex, and this difference is related to the charges on the ligands. In trans-(Bun3PPdCl2)2, the bridging 35Cl signal is found near 12·8 MHz at 0 °C, considerably lower than the terminal 35Cl signal at 19·50 MHz.
24 citations