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C R Rotundu and R J Birgeneau. First and second order magnetic and structural phase transitions in BaFe2(1-x)Co2xAs2. Physical Review B, 84, p. 092501, 2011.

Abstract: We present here high-resolution magnetization measurements on high-quality BaFe2(1&#8722;x)Co2xAs2, 0<x<0.046 as-grown single crystals. The results confirm the existence of a magnetic tricritical point in the (x,T) plane at x^m_tr &#8776; 0.022 and reveal the emergence of the heat-capacity anomaly associated with the onset of the structural transition at x^s &#8776; 0.0064. We show that the extrapolated Tc onset doping could be close to the magnetic tricritical point x^m_tr.

Keywords: iron pnictide superconductor, Co-doped BaFe2As2, tricritical

URL: http://prb.aps.org/abstract/PRB/v84/i9/e092501

Posted by Costel R Rotundu

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