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BaT2As2 Single Crystals (T = Fe, Co, Ni) and Superconductivity upon Co-doping

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arxiv 0903.0629 v1 pith:C2RZOA7B submitted 2009-03-03 cond-mat.supr-con cond-mat.str-el

BaT2As2 Single Crystals (T = Fe, Co, Ni) and Superconductivity upon Co-doping

Athena S. Sefat , David J. Singh , Rongying Jin , Michael A. McGuire , Brian C. Sales , Filip Ronning , David Mandrus This is my paper
classification cond-mat.supr-con cond-mat.str-el
keywords bafe2as2superconductivitytransitionbaco2as2bani2as2belowcrystalsmagnetic
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The crystal structure and physical properties of BaFe2As2, BaCo2As2, and BaNi2As2 single crystals are surveyed. BaFe2As2 gives a magnetic and structural transition at TN = 132(1) K, BaCo2As2 is a paramagnetic metal, while BaNi2As2 has a structural phase transition at T0 = 131 K, followed by superconductivity below Tc = 0.69 K. The bulk superconductivity in Co-doped BaFe2As2 below Tc = 22 K is demonstrated by resistivity, magnetic susceptibility, and specific heat data. In contrast to the cuprates, the Fe-based system appears to tolerate considerable disorder in the transition metal layers. First principles calculations for BaFe1.84Co0.16As2 indicate the inter-band scattering due to Co is weak.

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