Itinerant Ferromagnetism in the electronic localization limit

We present Hall effect, $R_{xy}(H)$, and magnetoresistance, $R_{xx}(H)$, measurements of ultrathin films of Ni, Co and Fe with thicknesses varying between 0.2-8 nm and resistances between 1 M$\Omega$ - 100 $\Omega.$ Both measurements show that films having resistance above a critical value, $R_{C}$, (thickness below a critical value, $d_{C}$) show no signs for ferromagnetism. Ferromagnetism appears only for films with $R<R_{C}$, where $R_{C}$ is material dependent. We raise the possibility that the reason for the absence of spontaneous magnetization is suppression of itinerant ferromagnetism by electronic disorder in the strong localization regime.Comment: 4 pages, 4 figure

Why Ownership Matters?: Politicization and Entrepreneurship in the Restructuring of Enterprises in Central Europe

This paper, base on a study of mid-sized firms in the Czech Republic, Hungary, and Poland, examines the sources of performance differences between state and privatized firms, particularly those that may be due to politicization and differences in the degree of entreprenurship. The paper presents empirical evidence that politicization of decision making is responsible for the observed inefficiencies in the cost behavior of state enterprises, but does not explain their inferior revenue performance, which is independent of the degree of state involvement.OWNERSHIP ; PRIVATIZATION ; HUMAN CAPITAL

Determination of characteristic relaxation times and their significance in glassy disordered insulators

We revisit the field effect procedure used to characterise the slow dynamics of glassy Anderson insulators. It is shown that in the slowest systems the procedure fails and the "characteristic" time values extracted are not intrinsic but determined by the experimental procedure itself. In other cases (like lightly doped indium oxide) qualitative indications about the dynamics might be obtained, however the times extracted cannot be seen as characteristic relaxation times of the system in any simple manner, and more complete experiments are necessary. Implications regarding the effect of carrier concentration on the emergence of glassiness are briefly outlined.Comment: published with minor proof correction