Possible hydrogen doping and enhancement of Tc (=35 K) in a LaFeAsO-based superconductor

Miyazawa, K.; Ishida, S.; Kihou, K.; Shirage, P. M.; Nakajima, M.; Lee, C. H.; Kito, H.; Tomioka, Y.; Ito, T.; Eisaki, H.; Yamashita, H.; Mukuda, H.; Tokiwa, K.; Uchida, S.; Iyo, A.
February 2010
Applied Physics Letters;2/15/2010, Vol. 96 Issue 7, p072514
Academic Journal
We report that the incorporation of hydroxide ions (OH)- significantly enhances the superconducting transition temperature (Tc) in the LnFeAsO-based superconductors (Ln1111: Ln=La, Ce, and Pr). For La1111, Tc of the (OH)- incorporated sample synthesized using high-pressure technique becomes 35 K, which is higher by 7 K than the typical optimally doped La1111 superconductors. Similar enhancement in Tc is also observed for Ce1111 and Pr1111. 1H-NMR measurement have confirmed the existence of hydrogen atoms in the samples. Accompanying the (OH)- incorporation, the lattice parameters are largely contracted, down to the values which have never been attained by any other dopings/substitutions.


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