Journal
PHYSICAL REVIEW B
Volume 83, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.224502
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Funding
- US Department of Energy, Office of Science, Office of Basic Energy Sciences as part of the Energy Frontier Research Center (EFRC)
- Center for Emergent Superconductivity (CES)
- NSF [DMR-0654118]
- state of Florida
- DOE
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Understanding iron-based superconductors requires high-quality impurity-free single crystals. So far they have been elusive for beta-FeSe and extraction of intrinsic materials properties has been compromised by several magnetic-impurity phases. Here, we report synchrotron-clean beta-FeSe superconducting single crystals grown via LiCl/CsCl flux method. Phase purity yields evidence for a defect-induced weak ferromagnetism that coexists with superconductivity below T-c. In contrast to Fe1+y Te-based superconductors, our results reveal that the interstitial Fe(2) site is not occupied and that all contribution to density of states at the Fermi level must come from in-plane Fe(1).
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