Journal
PHYSICAL REVIEW B
Volume 80, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.174509
Keywords
electrical resistivity; Hall effect; interstitials; iron compounds; localised states; magnetic susceptibility; specific heat; stoichiometry; superconducting materials
Funding
- NSF [DMR-0645305, DMR-0701582]
- DOE [DE-FG02-07ER46358, W911NF-08-C-0131, DE-FG02-04ER46159, W911NF-07-1-0182]
- DARPA [HR0011-07-1-0031]
- NBRPC [2006CB01003, 2009CB929104]
- Ministry of Education of China [IRT0754]
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We have investigated the effect of Fe nonstoichiometry on properties of the Fe1+y(Te,Se) superconductor system by means of resistivity, Hall coefficient, magnetic susceptibility, and specific-heat measurements. We find that the excess Fe at interstitial sites of the (Te, Se) layers not only suppresses superconductivity but also results in a weakly localized electronic state. We argue that these effects originate from the magnetic coupling between the excess Fe and the adjacent Fe square-planar sheets, which favors a short-range magnetic order.
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