نتایج جستجو برای: nuclear quadrupole resonance nqr

تعداد نتایج: 438028  

1999
Mariusz Maćkowiak

The effects of off-resonance irradiation in nutation NQR experiments are demonstrated both experimentally and theoretically. The theoretical description of the off-resonance effects in 2D nutation NQR spectroscopy is given, and general exact formulas for the asymmetry parameter are obtained. It is shown that the outcome of the off-resonance nutation experiments depends on the data acquisition p...

2004
H. Breitzke I. Eremin D. Manske E. V. Antipov

We report pure zero field nuclear magnetic resonance (NQR) measurements on the optimally doped three layer highTc-compounds HgBaCaCuO and HgBaCaCuO(F) with Tc 1⁄4 134 K. Above Tc two Cu NQR line pairs are observed in the spectra corresponding to the two inequivalent Cu lattice sites. Below Tc the Cu NQR spectra show additional lines leading to the extreme broadened Cu NQR spectra at 4.2 K well ...

Journal: :npj quantum materials 2023

Clarifying the interplay between charge density waves (CDWs) and superconductivity is important in kagome metal CsV$_3$Sb$_5$, pressure ($P$) can play a crucial role. Here, we present $^{121/123}$Sb nuclear quadrupole resonance (NQR) measurements under hydrostatic pressures up to 2.43 GPa CsV$_3$Sb$_5$ single crystals. We demonstrate that CDW gradually changes from commensurate modulation with ...

2015
Marjan Moridi Nasser L. Hadipour

In this study, nuclear magnetic resonance spectroscopy and nuclear quadrupole resonance spectroscopy parameters of N (Nitrogen in imidazole ring) in N–H...O hydrogen bonding for Histidine hydrochloride monohydrate were calculated via density functional theory. We considered a five-molecule model system of Histidine hydrochloride monohydrate. Also we examined the trends of environmental effect o...

Journal: :نشریه دانشکده فنی 0
مرتضی شهبازی مقدم

theoretical investigations on the characteristics of the nuclear quadrupole resonance and the influence of the magnetic effect on it have been carried out. the magnetic dipole effect on the quadrupole resonance for the two spins i and i with different values oft) and e has been studied. the energy levels and their transition probabilities are presented with their corresponding spectra. the firs...

2016
G. Koutroulakis H. Yasuoka P. H. Tobash J. N. Mitchell E. D. Bauer J. D. Thompson

PuCoGa5 has emerged as a prototypical heavy-fermion superconductor, with its transition temperature (Tc ' 18.5 K) being the highest amongst such materials. Nonetheless, a clear description as to what drives the superconducting pairing is still lacking, rendered complicated by the notoriously intricate nature of plutonium’s 5f valence electrons. Here, we present a detailed Ga nuclear quadrupole ...

1999
P. C. Hammel

La nuclear quadrupole resistance ~NQR! and relaxation measurements in lightly hole-doped La1.82xEu0.2SrxCuO4 have been used to investigate the microscopic properties of the low-temperature orthorhombic to low-temperature tetragonal transition. The transition is characterized by a sharp peak in La NQR relaxation rate, indicating phonon softening. We find that the structural phase transition is a...

Journal: :Science 2017
I Lovchinsky J D Sanchez-Yamagishi E K Urbach S Choi S Fang T I Andersen K Watanabe T Taniguchi A Bylinskii E Kaxiras P Kim H Park M D Lukin

Two-dimensional (2D) materials offer a promising platform for exploring condensed matter phenomena and developing technological applications. However, the reduction of material dimensions to the atomic scale poses a challenge for traditional measurement and interfacing techniques that typically couple to macroscopic observables. We demonstrate a method for probing the properties of 2D materials...

“Malaria” is a life-threatening blood disease in tropical regions that spreads by the bite of the Anopheles mosquito. Antimalarial medications are designed to cure or prevent this infection, and prosperous achievements in this area mostly depend on the knowing the drug-receptor interactions and active sites of medicine. This improvement can be achieved through understanding the electronic struc...

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