Single Crystals, Powders, and Anisotropy Effects
I have remarked on the fact that the rapid motion of liquids characteristic of high resolution NMR causes us to lose certain types of information. Let us now examine what that information is, and illustrate its significance. To do so I will pick a concrete example — one which my student Dr. Thomas Stakelon has recently carried out for his Ph. D. thesis, completed just before the start of this summer school. Like Dr. Alloul, we have been interested in the general problem of magnetic atoms, such as those of the iron group of the periodic table, in non-magnetic metals such as Cu or Al. Dr. Stakelon has studied the NMR of Cu nuclei which are near neighbours to Fe, Co, or Ni atoms in single crystals of Cu. My student Thomas Aton is looking at the spectrum of single crystals of Cu containing Mn and Cr. In my lecture I will discuss the form of the interactions, and the number and intensity of spectral lines which should result. I will not discuss what this tells us about theories of magnetic atoms in nonmagnetic hosts. My lecture will serve partly to introduce the work of Dr. Alloul.
KeywordsElectron Spin Resonance Central Transition Anisotropy Effect Knight Shift Magnetic Atom
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