Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 35: Superconductivity: Fe-based Superconductors - 122 and Theory

TT 35.6: Talk

Tuesday, March 13, 2018, 10:45–11:00, A 053

Synthesis and Characterization of YbFe₂As₂ Single Crystals — •Nilotpal Ghosh¹, Santhosh Raj², and R Navamathavan² — ¹Science and Engineering Research Board, Department of Science and Technology, Vasant Kunj, New Delhi, India — ²School of Advanced Sciences ,VIT University, Chennai, Tamilnadu, India

We report synthesization of a new compound YbFe₂As₂ crystals using melt growth technique. The crystals have been characterized by Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Analysis (EDX). Rietveld refinement of crushed single crystals has shown that the YbFe₂As₂ has monoclinic unit cell structure. Transport measurement has shown metallic behavior with a down turn in resistivity around 17K for YbFe₂As₂ which is similar to superconducting transition. The detailed magnetic studies by SQUID on these crystals have revealed the co-existence of strong antiferromagnetic and weak ferromagnetic characteristics. Influence of anti-ferromagnetic spin fluctuation in the normal state transport property has been found. Effect of oxygen adsorption on YbFe₂As₂ have been studied in detail.
S. S. Raj, N. Ghosh, R. Navamathavan, J. Supercond. Novel Magnetism 30 (2017) 287;
S. S. Raj, N. Ghosh, R. Navamathavan, Mater. Res. Express 4 (2017) 086101;