Strain Doping: A New Approach to Understanding and Controlling Advanced Materials
June 16, 2015 — Helium ions were used to control the length of a single axis in a crystal lattice, allowing for delicate manipulations of complex behavior. This accomplishment unlocks the door to engineering next-generation complex materials.
Importance of diminished local structural distortions and magnetism in causing iron-based superconductivity
September 29, 2014 — By analyzing the role of structural variation and magnetism of Cu dopants in FeAs planes, researchers demonstrated that orthorhombic distortions that give strong spin-density-wave spin (SDW) fluctuations are detrimental to superconductivity in BaFe2As2. The results provide new information about the interplay between local composition, magnetism and superconductivity.
Enhancing the Efficiency of Solar Energy Conversion in Titania
February 04, 2014 — A new method that simultaneously incorporates chromium (Cr) and nitrogen (N) atoms as Cr-N pairs into titania yields a material with an extraordinarily large (> 1 eV) band gap reduction.
Electronic properties of manganite surfaces robust against reduction
September 05, 2013 — While the broad range of properties of complex oxides degrade severely with decreasing oxygen content, it has now been shown that the electronic properties at their surfaces can remain unaffected in a reducing environment. This discovery carries important implications for the design of functional complex oxides for energy efficient catalysis and batteries that depend on these surface properties.
Revealing the rapid isothermal growth of graphene on catalytic substrates
July 01, 2013 — Real-time optical diagnostics reveal that graphene nucleates and grows rapidly and isothermally on Ni substrates by dissolution and precipitation of carbon; the flux-dependent kinetics indicate autocatalytic reactions.
Condensed phase growth of nanooysters from Fe-decorated single-wall carbon nanohorns
January 03, 2013 — New hybrid "nanooysters" consisting of encapsulated metal nanoparticles inside hollow carbon shells were synthesized by transforming single-wall carbon nanohorns with reactive metals in a rapid, high-temperature annealing process.