I.A. Campbell

TL;DR: In this paper, magnetic measurements on single crystals of YBa/sub 2/Cu/sub 3/O/sub 7/..sqrt../sub delta were performed and the magnetic critical current density in the Cu-O basal planes (1.5 x 10/sup 6/ Acm/sup 2/ at 4.2 K) decreases exponentially with temperature as well as with field for Tapprox. >50 K. This is ascribed to current tunneling through micro Josephson-junctions.

TL;DR: Magnetic and Mossbauer measurements on a 19-at.%-Fe alloy are reported in this article, where spin-glass-like transverse ordering sets in below $T\ensuremath{\cong}60$ K. This behavior is consistent with the predictions of a Heisenberg mean-field model, in which the transition is distinct from a crossover to strong irreversibility.

TL;DR: In this paper, the authors present experimental results for the resistivity anisotropy of Ni alloys containing transition impurities and show that the Smit spin mixing mechanism is dominant in all cases where there is no d virtual bound state at the spin ↑ Fermi level.

TL;DR: The muon depolarization function can be analyzed to show that the temperature dependence of the strongly nonexponential form of the local spin autocorrelation function in these canonical alloys is similar to that observed in numerical simulations on Ising spin glasses.

TL;DR: Hall-probe measurements of an YBa-Cu crystal show a temperature-independent time-logarithmic magnetic relaxation, which rule out conventional thermally activated flux creep and are consistent with a phenomenological theory assuming a quantum tunneling process for vortex kink motion.