Iron isotope effect on the superconducting transition temperature and the crystal structure of FeSe_1-x

Details Iron isotope effect on the superconducting transition temperature and the crystal structure of FeSe_1-x Iron isotope effect on the superconducting transition temperature and the crystal structure of FeSe_1-x

2010-02-12

arxiv.org/abs/1002.2510v2

New J. Phys. 12, 073024 (2010)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1088/1367-2630/12/7/073024

The Fe isotope effect (Fe-IE) on the transition temperature T_c and the crystal structure was studied in the Fe chalcogenide superconductor FeSe_1-x by means of magnetization and neutron powder diffraction (NPD). The substitution of natural Fe (containing \simeq 92% of ^{56}Fe) by its lighter ^{54}Fe isotope leads to a shift of T_c of 0.22(5)K corresponding to an Fe-IE exponent of \alpha_Fe=0.81(15). Simultaneously, a small structural change with isotope substitution is observed by NDP which may contribute to the total Fe isotope shift of T_c.

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