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Critical heat capacity near the nematicsmectic-A transition in octyloxycyanobiphenyl in the range 1-2000 bar

Physical Review B, ISSN: 0163-1829, Vol: 22, Issue: 1, Page: 321-331
1980
  • 100
    Citations
  • 0
    Usage
  • 3
    Captures
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    Mentions
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    100
    • Citation Indexes
      100
  • Captures
    3

Article Description

An ac calorimetric technique has been used to study the nematicsmectic-A (N-SmA) and nematic-isotropic (N-I) transitions in octyloxycyanobiphenyl (8OCB) along a series of isobars between 1 atm and 2 kbar. The excess heat capacity Cp(NA) associated with the essentially second-order N-SmA transition is found to diminish rapidly with pressure and is not observed for p>1.5 kbar. The variation in Cp(NA) with reduced temperature is not consistent with a logarithmic singularity but can be characterized by a critical exponent =0.250.05 for all the pressures studied. The excess heat capacity at the N-I transition is almost independent of pressure; these data suggest but do not clearly establish quasitricritical behavior. Details of the experimental method and the fitting procedures are given. © 1980 The American Physical Society.

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