The specific heat exponent α of classical n-vector model is studied up to the order of 1/n. It is shown that α has discontinuities at particular spatial dimensionalities, both for the short-range and the long-range interactions. The scaling law relations involving α break down at such dimensionalities.
We investigate the thermodynamic quantities of Blume-Emery-Griffiths model with long-range interactions and observe negative specific heat and susceptibility near the first order line, where the temperature, specific heat and susceptibility are discontinuity. When order-disorder phase transition takes place, the critical exponent of specific heat (α=α′=0) and the critical exponent of susceptibility (γ=γ′=1) are consistent with the prediction of mean field theory. However, when coupling constant corresponds to the value of canonical tri-critical point, the critical exponent of specific heat and susceptibility take the values of 0=α≠α′=1 and 1=γ≠γ′=2. The critical exponents violate the scaling homogeneity equalities and α′+β+γ′>2 breaks down the Widom scaling law.
Progress of Theoretical Physics Vol. 49 No. 2 (1973) pp. 424-441 Critical Exponents for Long-Range Interactions. I Masuo Suzuki Progress of Theoretical Physics Vol. 49 No. 3 (1973) pp. 1074-1075 Critical Exponent η up to 1/n2 for the Three-Dimensional System with Short-Range Interaction Ryuzo Abe Progress of Theoretical Physics Vol. 49 No. 4 (1973) pp. 1106-1120 Critical Exponents for Long-Range Interactions. II Masuo Suzuki Progress of Theoretical Physics Vol. 49 No. 5 (1973) pp. 1440-1450 Critical Exponents for Long-Range Interactions. III Masuo Suzuki Progress of Theoretical Physics Vol. 49 No. 5 (1973) pp. 1451-1458 Critical Behavior of the Anisotropic Classical n-Vector Model Masuo Suzuki Progress of Theoretical Physics Vol. 49 No. 6 (1973) pp. 1851-1857 Breakdown of Some Scaling Law Relations in 1/n Expansion Ryuzo Abe and Shinobu Hikami Progress of Theoretical Physics Vol. 49 No. 6 (1973) pp. 1877-1888 Critical Exponent η up to 1/n2 for the Three-Dimensional System with Short-Range Interaction Ryuzo Abe Progress of Theoretical Physics Vol. 50 No. 2 (1973) pp. 393-408 On the Expansion Theory of Critical Exponents Masuo Suzuki Progress of Theoretical Physics Vol. 51 No. 4 (1974) pp. 1041-1052 Discontinuities of Critical Amplitude for Specific Heat Ryuzo Abe and Shinobu Hikami Progress of Theoretical Physics Vol. 52 No. 2 (1974) pp. 369-378 Crossover Exponent of the Spin Anisotropic n-Vector Model with Short-Range Interaction in 1/n Expansion Shinobu Hikami and Ryuzo Abe Progress of Theoretical Physics Vol. 53 No. 1 (1975) pp. 97-110 On the Critical Dynamics in Bose Systems and the Time-Dependent Ginzburg-Landau Model Masuo Suzuki Progress of Theoretical Physics Vol. 53 No. 2 (1975) pp. 591-593 Dynamic Critical Behavior of Bose Systems at Tλ Giko Igarashi Progress of Theoretical Physics Vol. 68 No. 1 (1982) pp. 277-286 Strong Coupling Limit of Abelian Higgs Model and Its Correspondence with CPn-1 Model Jnanadeva Maharana