期刊
PHYSICAL REVIEW B
卷 80, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.064506
关键词
bonding processes; crystal binding; crystal structure; elastic moduli; high-temperature superconductors; iron compounds; lead compounds; X-ray diffraction
资金
- EPSRC [EP/G037949/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G037949/1] Funding Source: researchfish
alpha-FeSe with the PbO structure is a key member of the family of high-T-c iron pnictide and chalcogenide superconductors, as while it possesses the basic layered structural motif of edge-sharing distorted FeSe4 tetrahedra, it lacks interleaved ion spacers or charge-reservoir layers. We find that the application of hydrostatic pressure first rapidly increases T-c which attains a broad maximum of 37 K at similar to 7 GPa before decreasing to 6 K upon further compression to similar to 14 GPa. Complementary synchrotron x-ray diffraction at 16 K was used to measure the low-temperature isothermal compressibility of alpha-FeSe, revealing an extremely soft solid with a bulk modulus, K-0=30.7(1.1) GPa and strong bonding anisotropy between interlayer and intralayer directions that transforms to the more densely packed beta polymorph above similar to 9 GPa. The nonmonotonic T-c(P) behavior of FeSe coincides with drastic anomalies in the pressure evolution of the interlayer spacing, pointing to the key role of this structural feature in modulating the electronic properties.
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