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Recent discovery of superconductivity in iron pnictides had attracted immenseattention of the scientific community. The parent compounds were spin densitywave (SDW) metals unlike the high-TC superconductors which were Mottinsulators. In this present study, we synthesized single crystal of a newcompound YbFe2As2 by using high temperature solution growth technique withoutflux. The YbFe2As2 single crystals had been systematically characterized byenergy dispersive X-ray analysis (EDAX). The presence of oxygen was found byEDAX on the surfaces of grown YbFe2As2 single crystals which had been kept inair ambience for few months. The measurement of magnetization (M) versustemperature (T) using SQUID at constant magnetic field (H = 100 Oe) forYbFe2As2 had revealed an occurrence of sharp slope change around 140 K whichwas the known SDW transition temperature for the parent compound BaFe2As2. Anadditional slope change had been observed around 40 K. M vs T data at H= 10000Oe had exhibited paramagnetic behavior. Result of M versus H measurements forYbFe2As2 at 2 K had shown that the saturation had not been achieved at H =80000 Oe. We had carried out magnetization measurements for oxygen adsorbedYbFe2As2 (YbFe2As2 : O2 ) and BaFe2As2 (BaFe2As2 : O2) for comparative studyalso.

Investigation of magnetic characteristics of oxygen adsorbed YbFe2As2 single crystals