Aging effect in Magnetotransport Property of Oxygen adsorbed BaFe2As2
Nilotpal Ghosh, Santhosh Raj
TL;DR
This study investigates how oxygen adsorption over several months alters the magnetotransport properties of BaFe2As2 crystals, notably suppressing the SDW transition and modifying magnetoresistance behavior.
Contribution
It reveals the aging effects of oxygen adsorption on BaFe2As2, showing suppression of the SDW transition and changes in resistivity and magnetoresistance.
Findings
Oxygen adsorbed crystals are more resistive.
No sharp SDW transition near 140 K in aged samples.
Magnetoresistance increases with applied field differently after aging.
Abstract
Presence of Oxygen (O2) has been found by Energy Dispersive X-ray Analysis (EDAX) on the surfaces of flux grown BaFe2As2 single crystals which were kept in air ambience for several months. Transport studies show that the O2 adsorbed crystals are more resistive and do not display any sharp slope change near 140 K which is the well known Spin Density Wave (SDW) transition temperature (TSDW) accompanying structural transition for as grown BaFe2As2. An anomalous slope change in resistivity is observed around 18 K at 0 and 5T. Magnetoresistance (MR) is noticed to increase as a function of applied field (H) quite differently than that for as grown crystals below TSDW which may be attributed to aging effec
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Taxonomy
TopicsIron-based superconductors research · Intellectual Capital and Performance Analysis · Magnetic and transport properties of perovskites and related materials