Author: Fulton Watkins WrightPublisher:
ISBN:
Category :
Languages : en
Pages : 112
Book Description
Particle Size Effects in Nuclear Magnetic Resonance on Superconductors
Author: Fulton Watkins WrightPublisher:
ISBN:
Category :
Languages : en
Pages : 112
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).
Scientific and Technical Aerospace Reports
Author: Technical Abstract Bulletin
Author: Nuclear Science Abstracts
Author: Metallic Shifts in NMR: Review chapters NMR tables
Author: Gesina C. CarterPublisher:
ISBN:
Category : Knight shift
Languages : en
Pages : 408
Book Description
Nuclear Magnetic Resonance Study of Quantum Size Effects in Supported Platinum Particles
Author: Dale James DurandPublisher:
ISBN:
Category :
Languages : en
Pages : 206
Book Description
The author has observed, and studied quantum size effects in the NMR of small, supported platinum particles with a monolayer of carbon monoxide chemically adsorbed to the surface. The effects are observed in the $\sp{13}$C and $\sp{195}$Pt NMR, primarily at 4.2K. He reports nonmetallic spin-lattice relaxation, and changes in the Knight shift at low temperatures.
Nuclear Science Abstracts
Author: Nuclear Magnetic Resonance in Superconducting Tin
Author: Gaylord Marvin AndroesPublisher:
ISBN:
Category : Nuclear induction
Languages : en
Pages : 162
Book Description
Magnetic Resonance and Relaxation
Author: Robert BlincPublisher:
ISBN:
Category : Magnetic resonance
Languages : en
Pages : 1268
Book Description