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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).
The ability to mimic the hierarchical order at multiple length scales in natural materials, such as bone, is crucial for a bottom-up approach to materials design. Being able to mimic the formation of self-assembled nanocomposites of calcium phosphate using block copolypeptides as templates has allowed us to grow hydroxyapatite nanocrystals in the organic matrix with sizes and morphologies similar to that seen in natural bone. The hydroxyapatite nanocrystal size in the synthetic nanocomposites was determined controlled through the use of citrate, similar to native bone.