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  2. Phase transition - Wikipedia

    en.wikipedia.org/wiki/Phase_transition

    Under the Ehrenfest classification scheme, there could in principle be third, fourth, and higher-order phase transitions. For example, the Gross–Witten–Wadia phase transition in 2-d lattice quantum chromodynamics is a third-order phase transition, and the Tracy–Widom distribution can be interpreted as a third-order transition.

  3. Landau theory - Wikipedia

    en.wikipedia.org/wiki/Landau_theory

    Landau theory (also known as Ginzburg–Landau theory, despite the confusing name [1]) in physics is a theory that Lev Landau introduced in an attempt to formulate a general theory of continuous (i.e., second-order) phase transitions. [2]

  4. Quantum phase transition - Wikipedia

    en.wikipedia.org/wiki/Quantum_phase_transition

    Such a quantum phase transition can be a second-order phase transition. [1] Quantum phase transitions can also be represented by the topological fermion condensation quantum phase transition, see e.g. strongly correlated quantum spin liquid. In case of three dimensional Fermi liquid, this transition transforms the Fermi surface into a

  5. Charge ordering - Wikipedia

    en.wikipedia.org/wiki/Charge_ordering

    Charge ordering (CO) is a (first- or second-order) phase transition occurring mostly in strongly correlated materials such as transition metal oxides or organic conductors. Due to the strong interaction between electrons, charges are localized on different sites leading to a disproportionation and an ordered superlattice .

  6. Perturbation theory (quantum mechanics) - Wikipedia

    en.wikipedia.org/wiki/Perturbation_theory...

    6.2 Example of first- and second-order perturbation theory – quantum pendulum. ... The corresponding transition probability amplitude to first order is ...

  7. Glass transition - Wikipedia

    en.wikipedia.org/wiki/Glass_transition

    The glass transition presents features of a second-order transition since thermal studies often indicate that the molar Gibbs energies, molar enthalpies, and the molar volumes of the two phases, i.e., the melt and the glass, are equal, while the heat capacity and the expansivity are discontinuous.

  8. Ising model - Wikipedia

    en.wikipedia.org/wiki/Ising_model

    At zero temperature (i.e. infinite β), there is a second-order phase transition: the free energy is infinite, and the truncated two-point spin correlation does not decay (remains constant). Therefore, T = 0 is the critical temperature of this case. Scaling formulas are satisfied. [36]

  9. Ehrenfest equations - Wikipedia

    en.wikipedia.org/wiki/Ehrenfest_equations

    Ehrenfest equations (named after Paul Ehrenfest) are equations which describe changes in specific heat capacity and derivatives of specific volume in second-order phase transitions. The Clausius–Clapeyron relation does not make sense for second-order phase transitions, [ 1 ] as both specific entropy and specific volume do not change in second ...