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Continuous phase transition in a spin-glass model without time-reversal symmetry.
1Dipartimento di Fisica and INFN, Universita di Roma La Sapienza, Piazzale Aldo Moro 2, 00185 Roma, Italy. giorgio.paresi@roma1.infn.it
Summary
This study explores a disordered three-spin model, revealing a modified glass transition distinct from mean-field predictions. The research identifies a continuous phase transition with unique spin-glass susceptibility and specific-heat exponent characteristics.
Area of Science:
- Condensed matter physics
- Statistical mechanics
Background:
- The Adam-Gibbs-DiMarzio scenario describes mean-field glass transitions.
- Short-range interactions and broken time-reversal symmetry modify this behavior.
Purpose of the Study:
- Investigate phase transitions in a disordered short-range three-spin model.
- Characterize the nature of the glass transition beyond the mean-field limit.
Main Methods:
- Analysis of a three-spin interaction model.
- Examination of the Hamiltonian's lack of time-reversal symmetry.
- Mean-field limit comparison with short-range behavior.
Main Results:
- A finite temperature continuous phase transition was identified.
- The model exhibits divergent spin-glass susceptibility.
- A negative specific-heat exponent was observed.
Conclusions:
- The short-range three-spin model presents a modified glass transition scenario.
- The transition's nature is comparable to the Edwards-Anderson model in a magnetic field.
- This model offers an advantage by lacking strong crossover effects.