Author: Gaylord Marvin AndroesPublisher:
ISBN:
Category : Nuclear induction
Languages : en
Pages : 162
Book Description
Nuclear Magnetic Resonance in Superconducting Tin
Author: Gaylord Marvin AndroesPublisher:
ISBN:
Category : Nuclear induction
Languages : en
Pages : 162
Book Description
Particle Size Effects in Nuclear Magnetic Resonance on Superconductors
Author: Fulton Wright (Jr)Publisher:
ISBN:
Category :
Languages : en
Pages : 56
Book Description
The Knight shift in the superconducting state has been observed in samples containing various sizes of small tin particles. The three main samples were constructed by vacuum evaporation of alternate layers of metal and dielectric (silicon monoxide). The particles are in the form of platelets whose diameter and thickness were measured with an electron microscope. The geometric means of the particle dimensions were 170, 300, and 570 A. The fractions of the normal state shift (referred to alpha tin) remaining at zero temperature were 84, 74, 62 percent respectively. Three other samples produced by a variety of processes gave results consistent with those of the main samples. The data fit well the theory of spin-reversing scattering through spin-orbit coupling which has been proposed to explain the finite Knight shift in superconductors. Two other possible contributions, a shift due to Van Vleck type orbital susceptibility and crystalline field spin-orbit coupling, cannot be ruled out theoretically but do not appear important experimentally. The problem of an extra NMR line width in the small particle samples is discussed. (Author).
Magnetism and Superconductivity in Iron-based Superconductors as Probed by Nuclear Magnetic Resonance
Author: Franziska HammerathPublisher: Springer Science & Business Media
ISBN: 3834824232
Category : Science
Languages : en
Pages : 183
Book Description
Nuclear Magnetic Resonance (NMR) has been a fundamental player in the studies of superconducting materials for many decades. This local probe technique allows for the study of the static electronic properties as well as of the low energy excitations of the electrons in the normal and the superconducting state. On that account it has also been widely applied to Fe-based superconductors from the very beginning of their discovery in February 2008. This dissertation comprises some of these very first NMR results, reflecting the unconventional nature of superconductivity and its strong link to magnetism in the investigated compounds LaO1–xFxFeAs and LiFeAs.
Nuclear Science Abstracts
Author: Nuclear Magnetic Resonance in Cadmium and Tin
Author: Edward Mark DicksonNuclear Science Abstracts
Author: Technical Abstract Bulletin
Author: Defense Documentation Center (U.S.)Publisher:
ISBN:
Category : Technology
Languages : en
Pages : 1116
Book Description
Nuclear Magnetic Resonance Spectroscopy
Author: Frank A. BoveyPublisher: Elsevier
ISBN: 0080916996
Category : Science
Languages : en
Pages : 668
Book Description
Nuclear Magnetic Resonance Spectroscopy, Second Edition focuses on two-dimensional nuclear magnetic resonance (NMR) spectroscopy, high resolution NMR of solids, water suppression, multiple quantum spectroscopy, and NMR imaging. The selection first takes a look at the fundamental principles and experimental methods. Discussions focus on the NMR phenomenon, dipolar broadening and spin-spin relaxation, nuclear electric quadrupole relaxation, saturation, magnetic shielding and chemical shift, magnetic field, transitions between the nuclear energy levels, and resolution and sensitivity considerations. The manuscript then ponders on chemical shift, coupling of nuclear spins, and nuclear relaxation and chemical rate processes. Topics include spin lattice relaxation, spin-spin relaxation, spin decoupling and associated techniques, and description and analysis of spin systems. The text examines two-dimensional NMR spectroscopy, macromolecules, and NMR of solids, including magic angle spinning, cross polarization, proton dipolar broadening, biopolymers, and chain motion in macromolecules. The selection is a valuable source of data for readers interested in nuclear magnetic resonance spectroscopy.
Nuclear Magnetic Resonance Studies of YBa2̳Cu3̳07̳ in the Superconducting State
Author: Sean Eric BarrettAdvances in Magnetic Resonance
Author: Warren S. WarrenPublisher: Elsevier
ISBN: 0323157378
Category : Science
Languages : en
Pages : 292
Book Description
Advances in Magnetic Resonance: The Waugh Symposium, Volume 13 is a collection of manuscripts presented at the 1989 conference on "High Resolution NMR in Solids at Massachusetts Institute of Technology. This conference recognizes the accomplishments of John S. Waugh and his colleagues in the entire field of high resolution nuclear magnetic resonance (NMR) in solids. Organized into 11 chapters, this book first discusses the principles, limitations, and applications of single crystal, deuterium, proton, and rotational-echo double resonance NMR techniques. It then deals with other NMR methods, such as two-dimensional, electrophoretic, and site-selective excitation NMR, with particular emphasis on their theoretical background and application in solid systems. Other chapters describe several hybrid two-dimensional experiments leading to a significant increase in spectral quality. Discussions on the advantages of utilizing two-dimensional solid-state NMR in studying the complex and highly orientable biological samples such as DNA are provided in the concluding chapters of the book. This volume also provides the 113Cd NMR results in the prediction of the 113Cd shielding tensor orientation in the real ligand geometry at a metal site. Analytical and quantum chemists, physicists, biochemists, and materials science researchers will find this book invaluable.