Duration of the superwind phase of asymptotic giant branch stars

Article Abstract:

The mechanics of asymptotic giant branch (AGB) in low- and intermediate-mass stars was characterized based on the infrared analysis of two mass losing stars in the Magellanic Clouds. Analysis of the infrared and AGB stars indicated the presence of a superwind phase that was characterized as an evolutionary sequence that leads towards the planetary nebulae together with infrared stars. Furthermore, the superwind phase of the infrared stars lasts for 100,000 years.

Stars, Astronomical spectroscopy, Magellanic Clouds

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Giant magnetoresistance in Tl2Mn2O7 with the pyrochlore structure

Article Abstract:

The Tl2Mn2O7 with a pyrochlore structure shows giant magnetoresistance (GMR). Tl2Mn2O7 is electronically and structurally different from perovskites, the previously only known GMR materials. Mn ions interactions in the parent insulator are antiferromagnetic in the perovskite double-exchange systems. Ferromagnetic interaction may be increased partially due to the double exchange interaction. The charge carriers in Tl2Mn2O7 materials are electrons.

Manganese, Manganese (Metal), Strength of materials, Strength (Materials), Antiferromagnetism

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Low-field magnetoresistance in the pyrochlore Tisub2Mnsub2Osub7

Article Abstract:

Low-field grain-boundary magnetoresistance can be achieved in the pyrochlore T1sub2Mnsub2Osub7, a non-perovskite magnetoresistive oxide. The response will continue for all temperatures below transition to ferromagnetic state. Strong temperature-dependent decay characteristics were not displayed, and the improved response is thought to be partly due to weaker electron-spin coupling.

Observations, Perovskite, Magnetostatics

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