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Order-disorder transition in p-oligophenyls.

Kai Zhang1, Ren-Shu Wang2, Xiao-Jia Chen3

  • 1Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China and University of Science and Technology of China, Hefei 230026, China and Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China. xjchen@hpstar.ac.cn.

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Investigating crystalline p-oligophenyls reveals order-disorder transitions crucial for superconductivity. Transition temperatures increase with chain length, reaching a plateau for poly(para-phenylene).

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Polymer Science

Background:

  • Poly(para-phenylene) and its oligomers are conducting polymers with potential for superconductivity.
  • Order-disorder transitions in p-oligophenyls are linked to novel quantum functionality and superconductivity.
  • Accurate transition temperatures and chain length effects remain largely undetermined.

Purpose of the Study:

  • To systematically investigate the vibrational properties of crystalline p-oligophenyls across a wide temperature range.
  • To determine the order-disorder transition temperatures and their dependence on chain length.
  • To establish a phase diagram correlating transition temperature and melting curve.

Main Methods:

  • Vibrational spectroscopy (Raman) was employed to study crystalline p-oligophenyls.
  • Temperature-dependent measurements were performed over a broad thermal range.
  • Order-disorder transitions were identified using specific peak positions and intensity ratios.

Main Results:

  • The study identified three key indicators for detecting order-disorder transitions.
  • A phase diagram was constructed, showing the relationship between transition temperature, melting curve, and chain length.
  • The order-disorder transition temperature increases with p-oligophenyl chain length and plateaus around 350 K for poly(para-phenylene).

Conclusions:

  • The chain length significantly influences the order-disorder transition temperature in p-oligophenyls.
  • The findings provide crucial data for understanding superconductivity mechanisms in these materials.
  • The established phase diagram offers a predictive framework for designing novel conducting polymers.