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Sökning: WFRF:(Chang Chinglin)

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1.
  • Araujo, Carlos Moyses, et al. (författare)
  • Disorder-induced Room Temperature Ferromagnetism in Glassy Chromites
  • 2014
  • Ingår i: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 4, s. 4686-
  • Tidskriftsartikel (refereegranskat)abstract
    • We report an unusual robust ferromagnetic order above room temperature upon amorphization of perovskite [YCrO3] in pulsed laser deposited thin films. This is contrary to the usual expected formation of a spin glass magnetic state in the resulting disordered structure. To understand the underlying physics of this phenomenon, we combine advanced spectroscopic techniques and first-principles calculations. We find that the observed order-disorder transformation is accompanied by an insulator-metal transition arising from a wide distribution of Cr-O-Cr bond angles and the consequent metallization through free carriers. Similar results also found in YbCrO3-films suggest that the observed phenomenon is more general and should, in principle, apply to a wider range of oxide systems. The ability to tailor ferromagnetic order above room temperature in oxide materials opens up many possibilities for novel technological applications of this counter intuitive effect.
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2.
  • Zhong, Jun, et al. (författare)
  • Understanding the scattering mechanism of single-walled carbon nanotube based gas sensors
  • 2010
  • Ingår i: Carbon. - : Elsevier BV. - 0008-6223 .- 1873-3891. ; 48:7, s. 1970-1976
  • Tidskriftsartikel (refereegranskat)abstract
    • In the interaction between gas molecules with single-walled carbon nanotube (SWCNT) we show that as a result of collisions the gas scattering contributes with an important background signal and should be considered in SWCNT-based gas sensors. Experimental evidence of the collision-induced tube wall deformation is demonstrated using in situ X-ray absorption near-edge structure spectroscopy. Results support the occurrence of the scattering process and show how gas collisions may affect the electronic structure of SWCNTs.
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