Irreversibility temperature from magnetic relaxation

A ug 2 00 1 Magnetic relaxation and critical current density of MgB 2 thin films

Magnetic relaxation and critical current density have been measured on a M gB 2 thin film in a wide region of temperature with the magnetic field up to 8 T. The irreversibility line has also been determined. It is found that the relaxation rate has a very weak temperature dependence below 1/2T c showing a clear residual relaxation rate at zero K, which cannot be easily explained as due to therm...

Magnetic frustration of graphite oxide

Delocalized π electrons in aromatic ring structures generally induce diamagnetism. In graphite oxide, however, π electrons develop ferromagnetism due to the unique structure of the material. The π electrons are only mobile in the graphitic regions of graphite oxide, which are dispersed and surrounded by sp3-hybridized carbon atoms. The spin-glass behavior of graphite oxide is corroborated by th...

Magnetic relaxation and irreversibility in a superconducting Tl2Ba2Ca2Cu3O10+/-x thin film.

Reentrant Irreversibility and Magnetic Transition in Strongly Underdoped Y0.47Pr0.53Ba2Cu3O7-δ Single Crystals

Magnetization measurements on Y0.47Pr0.53Ba2Cu3O7 single crystal in the vicinity of the superconducting transition temperature Tc = 7 K revealed a reentrant irreversibility for applied magnetic fields higher than the irreversibility field Hirr. The transition to the second hysteresis loop occurs through an irreversible jump in magnetization. The temperature range of this irreversibility extends...

Analysis of Transient Rivlin-Ericksen Fluid and Irreversibility of Exothermic Reactive Hydromagnetic Variable Viscosity

This study analyzes the unsteady Rivlin-Ericksen fluid and irreversibility of exponentially temperature dependent variable viscosity of hydromagnetic two-step exothermic chemical reactive flow along the channel axis with walls convective cooling. The non-Newtonian Hele-Shaw flow of Rivlin-Erickson fluid is driven by bimolecular chemical kinetic and unvarying pressure gradient. The reactive flui...