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Institution

Chalk River Laboratories

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About: Chalk River Laboratories is a based out in . It is known for research contribution in the topics: Neutron diffraction & Neutron scattering. The organization has 2297 authors who have published 2700 publications receiving 73287 citations.


Papers
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Journal ArticleDOI
TL;DR: In this article, the authors studied the spin ordering and low energy spin dynamics of cuprate superconductors with a single crystal underdoped with a high temperature of 29 K and a low temperature of 0.095.
Abstract: By using neutron scattering techniques, we have studied the incommensurate spin ordering as well as the low energy spin dynamics in single crystal underdoped ${\text{La}}_{2\ensuremath{-}x}{\text{Ba}}_{x}{\text{CuO}}_{4}$ with $x\ensuremath{\sim}0.095$ and 0.08, which are high temperature superconductors with ${T}_{C}\ensuremath{\sim}27$ and 29 K, respectively. Static two dimensional incommensurate magnetic order appears below ${T}_{N}=39.5\ifmmode\pm\else\textpm\fi{}0.3\text{ }\text{K}$ in ${\text{La}}_{2\ensuremath{-}x}{\text{Ba}}_{x}{\text{CuO}}_{4}$ $(x=0.095)$ and a similar temperature for $x=0.08$ within the low temperature tetragonal phase. The spin order is unaffected by either the onset of superconductivity or the application of magnetic fields of up to 7 T applied along the $c$ axis in the $x=0.095$ sample. Such a magnetic field independent behavior is in marked contrast to the field induced enhancement of the staggered magnetization observed in the related ${\text{La}}_{2\ensuremath{-}x}{\text{Sr}}_{x}{\text{CuO}}_{4}$ system, which indicates that this phenomenon is not a universal property of cuprate superconductors. Surprisingly, we find that the incommensurability $\ensuremath{\delta}$ is only weakly dependent on doping relative to ${\text{La}}_{2\ensuremath{-}x}{\text{Sr}}_{x}{\text{CuO}}_{4}$. Dispersive excitations in ${\text{La}}_{2\ensuremath{-}x}{\text{Ba}}_{x}{\text{CuO}}_{4}$ $(x=0.095)$ at the same incommensurate wave vector persist up to at least 60 K. The dynamical spin susceptibility of the low energy spin excitations saturates below ${T}_{C}$ in a similar manner to that seen in the superconducting state of ${\text{La}}_{2}{\text{CuO}}_{4+y}$.

25 citations

Journal ArticleDOI
TL;DR: An overview of the experiments that have been performed for both ground-based and space studies in an effort to characterise the response of these detectors to various particle types in low earth orbit is provided and results from the various space investigations are presented.
Abstract: A passive neutron-bubble dosemeter (BD), developed by Bubble Technology Industries, has been used for space applications. Both the bubble detector-personal neutron dosemeter and bubble detector spectrometer have been studied at ground-based facilities in order to characterise their response due to neutrons, heavy ion particles and protons. This technology was first used during the Canadian-Russian collaboration aboard the Russian satellite BION-9, and subsequently on other space missions, including later BION satellites, the space transportation system, Russian MIR space station and International Space Station. This paper provides an overview of the experiments that have been performed for both ground-based and space studies in an effort to characterise the response of these detectors to various particle types in low earth orbit and presents results from the various space investigations.

25 citations

Journal ArticleDOI
TL;DR: In this article, the properties of nano-sized helium bubbles as a function of the helium-to-vacancy ratio were calculated at 600 K. The results from simulations were found to be in good agreement with experimental data.

25 citations

Journal ArticleDOI
TL;DR: By building AOPs in the radiation field, a network of data-sharing initiatives will enhance the interpretation of existing knowledge where current scientific evidence is minimal and provide new avenues to understand effects at low-dose and dose-rates.
Abstract: Purpose: In 2012, the Organization for Economic Cooperation and Development (OECD) formally launched the Adverse Outcome Pathway (AOP) Programme. The AOP framework has the potential for predictive ...

25 citations

Journal ArticleDOI
TL;DR: The linear chiral sigma model with quark fields and elementary pion and sigma fields is used to describe static properties of the nucleon and the ..delta.. resonance and baryon Fock states with good spin and isospin are constructed.
Abstract: The linear chiral \ensuremath{\sigma} model with quark fields and elementary pion and \ensuremath{\sigma} fields is used to describe static properties of the nucleon and the \ensuremath{\Delta} resonance. To this end baryon Fock states with good spin and isospin are constructed from summations of components in which three quarks in s states with the SU(2)\ifmmode\times\else\texttimes\fi{}SU(2) quantum numbers of the nucleon and \ensuremath{\Delta} are coupled to multipion states and a scalar-isoscalar coherent state of the \ensuremath{\sigma} fields. The multipion states are constructed to have coherent properties as well as definite spin-isospin quantum numbers. Ignoring the effects of vacuum polarization the baryon energy is made stationary, resulting in a set of four coupled nonlinear eigenvalue equations and a diagonalization procedure between frozen fields. The corresponding solitonic solutions are used to evaluate the relevant nucleon properties. A comparison is made with the results from the cloudy-bag model, the projected mean-field chiral-soliton model, and the Skyrme approach.

25 citations


Authors

Showing all 2298 results

NameH-indexPapersCitations
Michael D. Guiver7828820540
Robert J. Birgeneau7858722686
Mike D. Flannigan7121121327
Martin T. Dove6139614767
Luis Rodrigo5834112963
André Longtin5626016372
David Mitlin5619615479
John Katsaras552209263
John E. Greedan5539112171
Gang Li484067713
Matthew G. Tucker452247288
Bruce D. Gaulin452846698
Erick J. Dufourc431445882
Norbert Kučerka431197319
Stephen J. Skinner421948522
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20231
202284
202176
202072
201974
2018104