Journal
PHYSICAL REVIEW B
Volume 79, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.052508
Keywords
antiferromagnetism; arsenic alloys; elastic constants; fluctuations in superconductors; frustration; iron alloys; lithium alloys; muon probes; superconducting transition temperature; superfluidity
Funding
- EPSRC [EP/G003092/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G003092/1] Funding Source: researchfish
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Transverse-field muon-spin rotation measurements performed on two samples of LiFeAs demonstrate that the superfluid stiffness of the superconducting condensate in relation to its superconducting transition temperature is enhanced compared to other pnictide superconductors. Evidence is seen for a field-induced magnetic state in a sample with a significantly suppressed superconducting transition temperature. The results in this system highlight the role of direct Fe-Fe interactions in frustrating pairing mediated by antiferromagnetic fluctuations and indicate that, in common with other pnictide superconductors, the system is close to a magnetic instability.
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