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Finite Size Effect on the Specific Heat of a Bose Gas in Multi-filament Cables

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Abstract

The specific heat for an ideal Bose gas confined in semi-infinite multi-filament cables is analyzed. We start with a Bose gas inside a semi-infinite tube of impenetrable walls and finite rectangular cross section. The internal filament structure is created by applying to the gas two, mutually perpendicular, finite Kronig–Penney delta potentials along the tube cross section, while particles are free to move perpendicular to the cross section. The energy spectrum accessible to the particles is obtained and introduced into the grand potential to calculate the specific heat of the system as a function of temperature for different values of the periodic structure parameters such as the cross-section area, the wall impenetrability, and the number of filaments. The specific heat as a function of temperature shows at least two maxima and one minimum. The main difference with respect to the infinite case is that the peak associated with the BE condensation becomes a smoothed maximum, namely there is not a jump in the specific heat derivative, whose temperature no longer represents a critical point.

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Acknowledgments

We thank support from Grants PAPIIT-IN111613 and CONACyT 221030.

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Authors and Affiliations

  1. Posgrado en Ciencias Físicas, UNAM, Apdo. Postal 20-364, 01000, Mexico, D.F., Mexico

    G. Guijarro

  2. Instituto de Física, UNAM, Apdo. Postal 20-364, 01000, Mexico, D.F., Mexico

    M. A. Solís

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  1. G. Guijarro
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  2. M. A. Solís
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Correspondence to G. Guijarro.

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Guijarro, G., Solís, M.A. Finite Size Effect on the Specific Heat of a Bose Gas in Multi-filament Cables. J Low Temp Phys 183, 152–160 (2016). https://doi.org/10.1007/s10909-015-1446-z

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  • DOI: https://doi.org/10.1007/s10909-015-1446-z

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