Observation of NMR of the Formation of Localized Electronic States in an Ionic Liquid Alloy

R. Dupree; D. J. Kirby; W. Freyland; W. W. Warren, Jr

doi:10.1103/PhysRevLett.45.130

Observation of NMR of the Formation of Localized Electronic States in an Ionic Liquid Alloy

R. Dupree, D. J. Kirby, W. Freyland, and W. W. Warren, Jr.

Phys. Rev. Lett. 45, 130 – Published 14 July 1980

Abstract

${}^{133}{Cs}$ NMR results are reported for liquid Cs-Au alloys ranging from pure Cs to 18% excess Au in the ionic liquid compound CsAu. As one approaches CsAu from the Cs-rich side, a rapid drop in the Knight shift is observed, accompanied by a sharp peak in the nuclear relaxation rate at about 5% excess Cs in CsAu. Analysis of the static and dynamic hyperfine fields shows that the conduction electrons abruptly localize, probably as $F$ - center analogs, when the concentration of excess Cs falls below about 7%.