Nuclear magnetic resonance in high-T_c superconductors

Abstract

This paper is aimed at the nonspecialist In nuclear magnetic resonance who wants to know what NMR can do to increase his understanding of high-r^ superconductors. IMost NIMR results are discussed in an illustrative manner to facilitate intuitive understanding. Several specific NMR experiments are presented which demonstrate the variety of this experimental technique. Special emphasis is given to the following aspects: ionic charges and quadrupole interaction, local fields and magnetic ordering, conduction electrons and Knight shifts, quasiparticle excitations, and nuclear spinlattice relaxation.

NMR studies of Nd2−x Ce x CuO4

“…The line is relatively narrow (,-, 1 MHz) and shows no evidence for any quadrupolar effects on the lineshape unlike 63Cu in YBa2Cu307 (see e.g. Mehring 1989). This is in agreement with the low temperature results of Zheng et al (1989) and Abe et al (1989).…”