Calculation of entropy and specific heat in the spin polaron formulation at finite temperature

A. A. Morales, D. M. Yanga, S. Kurihara

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    Entropy and specific heat are calculated using the spin polaron formulation at finite temperature. Our theoretical approach makes use of the Matsubara Green's function method where the interaction term in the S-matrix is the spin polaron Hamiltonian, which is constructed in a representation where holes are described as spinless fermions (holons) and spins as normal bosons. In the absence of this interaction term, the normal entropy and specific heat are obtained from the free holon thermodynamic potential and are found to resemble the BCS expressions in the low temperature regime. A second cumulant expansion of the thermodynamic potential with the spin polaron interaction yields an expression for the specific heat whose dominant term in the low temperature limit and small quasiparticle energy difference, resembles the superconducting-state electronic specific heat of the BCS theory.

    Original languageEnglish
    Pages (from-to)283-287
    Number of pages5
    JournalJournal of Superconductivity and Novel Magnetism
    Volume17
    Issue number2
    Publication statusPublished - 2004

    Fingerprint

    Gene Conversion
    Specific heat
    Entropy
    specific heat
    entropy
    formulations
    heat
    Thermodynamics
    Hamiltonians
    Temperature
    thermodynamics
    Bosons
    BCS theory
    temperature
    Fermions
    Electronic states
    interactions
    Green's function
    Green's functions
    bosons

    Keywords

    • Entropy
    • Matsubara Green's function
    • Specific heat
    • Spin polaron
    • Thermodynamic potential

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Physics and Astronomy (miscellaneous)

    Cite this

    Calculation of entropy and specific heat in the spin polaron formulation at finite temperature. / Morales, A. A.; Yanga, D. M.; Kurihara, S.

    In: Journal of Superconductivity and Novel Magnetism, Vol. 17, No. 2, 2004, p. 283-287.

    Research output: Contribution to journalArticle

    @article{327d154ccfde462c9552b69b58f40d8b,
    title = "Calculation of entropy and specific heat in the spin polaron formulation at finite temperature",
    abstract = "Entropy and specific heat are calculated using the spin polaron formulation at finite temperature. Our theoretical approach makes use of the Matsubara Green's function method where the interaction term in the S-matrix is the spin polaron Hamiltonian, which is constructed in a representation where holes are described as spinless fermions (holons) and spins as normal bosons. In the absence of this interaction term, the normal entropy and specific heat are obtained from the free holon thermodynamic potential and are found to resemble the BCS expressions in the low temperature regime. A second cumulant expansion of the thermodynamic potential with the spin polaron interaction yields an expression for the specific heat whose dominant term in the low temperature limit and small quasiparticle energy difference, resembles the superconducting-state electronic specific heat of the BCS theory.",
    keywords = "Entropy, Matsubara Green's function, Specific heat, Spin polaron, Thermodynamic potential",
    author = "Morales, {A. A.} and Yanga, {D. M.} and S. Kurihara",
    year = "2004",
    language = "English",
    volume = "17",
    pages = "283--287",
    journal = "Journal of Superconductivity and Novel Magnetism",
    issn = "1557-1939",
    publisher = "Springer New York",
    number = "2",

    }

    TY - JOUR

    T1 - Calculation of entropy and specific heat in the spin polaron formulation at finite temperature

    AU - Morales, A. A.

    AU - Yanga, D. M.

    AU - Kurihara, S.

    PY - 2004

    Y1 - 2004

    N2 - Entropy and specific heat are calculated using the spin polaron formulation at finite temperature. Our theoretical approach makes use of the Matsubara Green's function method where the interaction term in the S-matrix is the spin polaron Hamiltonian, which is constructed in a representation where holes are described as spinless fermions (holons) and spins as normal bosons. In the absence of this interaction term, the normal entropy and specific heat are obtained from the free holon thermodynamic potential and are found to resemble the BCS expressions in the low temperature regime. A second cumulant expansion of the thermodynamic potential with the spin polaron interaction yields an expression for the specific heat whose dominant term in the low temperature limit and small quasiparticle energy difference, resembles the superconducting-state electronic specific heat of the BCS theory.

    AB - Entropy and specific heat are calculated using the spin polaron formulation at finite temperature. Our theoretical approach makes use of the Matsubara Green's function method where the interaction term in the S-matrix is the spin polaron Hamiltonian, which is constructed in a representation where holes are described as spinless fermions (holons) and spins as normal bosons. In the absence of this interaction term, the normal entropy and specific heat are obtained from the free holon thermodynamic potential and are found to resemble the BCS expressions in the low temperature regime. A second cumulant expansion of the thermodynamic potential with the spin polaron interaction yields an expression for the specific heat whose dominant term in the low temperature limit and small quasiparticle energy difference, resembles the superconducting-state electronic specific heat of the BCS theory.

    KW - Entropy

    KW - Matsubara Green's function

    KW - Specific heat

    KW - Spin polaron

    KW - Thermodynamic potential

    UR - http://www.scopus.com/inward/record.url?scp=3543105042&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=3543105042&partnerID=8YFLogxK

    M3 - Article

    AN - SCOPUS:3543105042

    VL - 17

    SP - 283

    EP - 287

    JO - Journal of Superconductivity and Novel Magnetism

    JF - Journal of Superconductivity and Novel Magnetism

    SN - 1557-1939

    IS - 2

    ER -