Alkali‐Metal‐Intercalated Percolation Network Regulates Self‐Assembled Electronic Aromatic Molecules

We show the effect of potassium-intercalation on the percolation network in self-assembled aromatic molecular crystals

Yong Hu; Guohua Zhong; Ying‐Shi Guan; Nam Hoon Lee; Yuan Zhang; Yang Li; Travis Mitchell; Jason N. Armstrong; Jason Benedict; Saw‐Wai Hla; Shenqiang Ren

2019

Scholarcy highlights

  • The pioneering seminal work by Little has inspired the continuous search for high-temperature organic superconductors since 1964
  • In this new alkali-metal-doped aromatic p-terphenyl molecular crystal, we find that it gives rise to an extended temperature-range metallicity in an otherwise insulating solid
  • The scanning tunneling microscopy study shows that potassium intercalation and electronic correlation induce an appearance of one-dimensional electron percolating networks, which regulate the conductivity, as well as the electronic and optical transitions, in alkali-metal-intercalated p-terphenyl
  • The magnetic and STM studies together support that the conducting channels are one-dimensional electron percolating networks formed through potassium intercalation into p-terphenyl, providing a small shielding fraction volume
  • The STM and spectroscopy studies show that the potassium intercalation and electronic correlation induce an appearance of one-dimensional electron percolating networks, which regulate the conductivity, as well as the electronic and optical transitions in alkali-metal-intercalated pterphenyl
  • The K2.75C18H14 thin film was prepared with the following steps: Potassium, pterphenyl and biphenyl were mixed together in a glass bottle with ratio of potassium: p-terphenyl: biphenyl = 2.75 : 3: 1; The mixture is stirred at 393 K for 2 hours; After the stirring process, the obtained black solid is sealed in a high-vacuum glass tube with glass substrate inside for further annealing at 493 K for 48 hours, with a temperature gradient along the glass tube

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