IDEAS home Printed from https://ideas.repec.org/a/eee/phsmap/v132y1985i2p504-536.html
   My bibliography  Save this article

Phase transitions in a disordered extended Hubbard model and in the random field Blume-Capel model

Author

Listed:
  • Micnas, R.
  • Chao, K.A.
  • Robaszkiewicz, S.

Abstract

The phase transitions in a half-filled random-site-energy extended Hubbard model (RSEHM) and in the random field Blume-Capel model (RFBCM) are studied with the mean-field approximation and with the renormalization group approach. The two-delta, the Gaussian and the square distribution of the random site energy are considered. The phase diagram includes the high charge order, the low charge order, the electron glass and the Mott phase. Depending on the form of distribution function, one may find lines of tricritical points, isolated critical points and triple points, as well as the heat charge order phenomenon. These results are then transformed in order to study the RFBCM, which exhibits a similar phase diagram but without heat magnetization. The effect of fluctuations on the mean-field phase diagram is briefly discussed using the renormalization group method. We conjecture that the tricritical point in a system with random field is different from that in a pure system.

Suggested Citation

  • Micnas, R. & Chao, K.A. & Robaszkiewicz, S., 1985. "Phase transitions in a disordered extended Hubbard model and in the random field Blume-Capel model," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 132(2), pages 504-536.
  • Handle: RePEc:eee:phsmap:v:132:y:1985:i:2:p:504-536
    DOI: 10.1016/0378-4371(85)90024-X
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/037843718590024X
    Download Restriction: Full text for ScienceDirect subscribers only. Journal offers the option of making the article available online on Science direct for a fee of $3,000

    File URL: https://libkey.io/10.1016/0378-4371(85)90024-X?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    References listed on IDEAS

    as
    1. Aharony, Joseph, 1979. "Time Effects in Empirical Stock Valuation Models," The Review of Economics and Statistics, MIT Press, vol. 61(3), pages 460-466, August.
    2. Ronis, David & Mukamel, Shaul, 1982. "On the validity of non-Markov reduced equations of motion in non-equilibrium statistical mechanics," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 112(1), pages 1-17.
    Full references (including those not matched with items on IDEAS)

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Borges, H.E. & Silva, P.R., 1987. "Thermodynamical properties of the random field Ising model," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 144(2), pages 561-573.
    2. Hartmann, Alexander K., 1998. "Ground-state structure of diluted antiferromagnets and random field systems," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 248(1), pages 1-20.
    3. Rubí, J.M. & Díaz-Guilera, A. & Torner, Ll., 1987. "Spatial correlations for temperature fluctuations from surface noise," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 141(1), pages 220-232.
    4. Hartmann, A.K. & Usadel, K.D., 1995. "Exact determination of all ground states of random field systems in polynomial time," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 214(2), pages 141-152.
    5. Torner, Ll. & Rubí, J.M. & Díaz-Guilera, A., 1989. "On fluctuations in interfacial fluid systems," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 157(2), pages 1018-1032.
    6. Al Mukadam, Hasan M. & Uzunov, Dimo I., 1996. "Phase transitions in two sublattice Ising systems," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 232(1), pages 326-348.

    More about this item

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:eee:phsmap:v:132:y:1985:i:2:p:504-536. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Catherine Liu (email available below). General contact details of provider: http://www.journals.elsevier.com/physica-a-statistical-mechpplications/ .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.