Correlation of superconductivity with crystal structure in (N H3)y C sxFeSe

The superconducting transition temperature Tc of ammoniated metal-doped FeSe (NH3)yMxFeSe (M: metal atom) has been scaled with the FeSe plane spacing, and it has been suggested that the FeSe plane spacing depends on the location of metal atoms in (NH3)yMxFeSe crystals. Although the crystal structure of (NH3)yLixFeSe exhibiting a high Tc (∼44 K) was determined from neutron diffraction, the structure of (NH3)yMxFeSe exhibiting a low Tc (∼32 K) has not been determined thus far. Here, we determined the crystal structure of (NH3)yCs0.4FeSe(Tc=33K) through the Rietveld refinement of the x-ray diffraction (XRD) pattern measured with synchrotron radiation at 30 K. The XRD pattern was analyzed based on two different models, on-center and off-center, under a space group of I4/mmm. In the on-center structure, the Cs occupies the 2a site and the N of NH3 may occupy either the 4c or 2b site, or both. In the off-center structure, the Cs may occupy either the 4c or 2b site, or both, while the N occupies the 2a site. Only an on-center structure model in which the Cs occupies the 2a and the N of NH3 occupies the 4c site provided reasonable results in the Rietveld analysis. Consequently, we concluded that (NH3)yCs0.4FeSe can be assigned to the on-center structure, which produces a smaller FeSe plane spacing leading to the lower Tc.