Macroscopic Elastic Studies of Orientational Ordering in Single-Crystal Fullerites

Dolinar, P.; Schranz, W.; Haluška, M.; Kuzmany, H.

doi:10.1080/10641229608001547

Cited by 2 publications

(2 citation statements)

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“…There are indeed some quite distinct differences between the two modes. The observed C eff is, for example, not the same combination of C i j 's for both cases, 8 and in addition the stress is homogeneous in the PP mode whereas the 3PB setup induces an inhomogeneous stress profile in the sample. 22 But neither of these differences seems to be directly correlated to the contribution of fluctuations to elastic constants.…”

Section: Application Of the Heat-diffusion Model To C 60mentioning

confidence: 81%

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Dynamic hardening of C60:A heat-diffusion central-peak model

Dolinar

Schranz

1997

Phys. Rev. B

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The elastic constant C of pure solid C 60 , measured at low frequencies with a dynamical mechanical analyzer, exhibits in the vicinity of the order-disorder phase transition at T c ϭ260 K a qualitatively different type of behavior. Besides the expected negative dip, an additional positive peak appears close to T c in the real part of C, resulting in a double anomaly. The experiments show that this hardening is due to a slow relaxational process. Within the macroscopic Landau theory we discuss possible origins of this unusual effect. We present a qualitative description based on the heat-diffusion central-peak model, which describes lowfrequency dynamics near phase transitions. Extending this model with a critically temperature-dependent thermal diffusion time, we can explain the double anomaly by a crossover from isothermal to adiabatic behavior and back. The difference between the two limits arises due to a coupling between the fluctuations in order parameter and in temperature.

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Section: Application Of the Heat-diffusion Model To C 60mentioning

confidence: 81%

“…The results were published in detail previously. [6][7][8]20 In Fig. 1 we show a typical temperature evolution of C in both geometries, which differ in homogeneity of the applied stress and consequently in typical length scale of the measurement.…”

Section: Experiments and Discussionmentioning

confidence: 99%