Journal
NEW JOURNAL OF PHYSICS
Volume 12, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/12/7/073024
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Funding
- Swiss National Science Foundation
- NCCR
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The Fe isotope effect (Fe-IE) on the transition temperature T-c and the crystal structure was studied in the Fe chalcogenide superconductor FeSe1-x by means of magnetization and neutron powder diffraction (NPD). The substitution of natural Fe (containing similar or equal to 92% of Fe-56) by its lighter Fe-54 isotope leads to a shift in 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 NPD, which may contribute to the total Fe isotope shift of T-c.
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