Organometallc nanomaterials hold the promise for molecular hydrogen (H2) storage by providing nearly ideal binding strength to H2 for room-temperature applications. However, synthesizing such materials faces severe setbacks due to the problem of metal clustering. Inspired by a recent experimental breakthrough (J. Am. Chem. Soc.
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Spin fluctuations are considered to be one of the candidates that drive a sign-reversed s±- superconducting state in the iron pnictides. In the magnetic scenario, whether the spin fluctuation spectrum exhibits certain unique fine structures is an interesting aspect for theoretical study to understand experimental observations.
Anisotropic Hc2 for the K0.8Fe1.76Se2 single crystals. Solid circles are obtained from the pulsed field radio frequency shift measurements and closed (open) square and triangle symbols are taken from temperature (magnetic field)-dependent resistance measurements. Inset shows the temperature dependence of the magnetic hyperfine field (Bhf).