Phase diagrams of a 2D Ising spin-pseudospin model
| Autor: | Yu. D. Panov, A. A. Chikov, V. A. Ulitko, A. S. Moskvin, K. S. Budrin |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Monte Carlo method
FOS: Physical sciences 02 engineering and technology 01 natural sciences chemistry.chemical_compound Charge ordering ANTIFERROMAGNETISM PHASE SEPARATION 0103 physical sciences HIGH-TC CUPRATES Antiferromagnetism ANALYTICAL EXPRESSIONS Spin (physics) Condensed Matter - Statistical Mechanics QUANTUM LIQUIDS Phase diagram 010302 applied physics Physics Condensed matter physics Statistical Mechanics (cond-mat.stat-mech) SPIN AND CHARGE ORDERINGS CUPRATES Charge (physics) ISING MODEL ANTIFERROMAGNETICS CHARGE CORRELATION 021001 nanoscience & nanotechnology Condensed Matter Physics Electronic Optical and Magnetic Materials chemistry DILUTE ISING MODEL CHARGED IMPURITY Ising model Condensed Matter::Strongly Correlated Electrons 0210 nano-technology AFm phase COPPER COMPOUNDS CHARGE ORDERING |
| Zdroj: | J Magn Magn Mater Journal of Magnetism and Magnetic Materials |
| Popis: | We consider the competition of magnetic and charge ordering in high-Tc cuprates within the framework of the simplified static 2D spin-pseudospin model. This model is equivalent to the 2D dilute antiferromagnetic (AFM) Ising model with charged impurities. We present the mean-field results for the system under study and make a brief comparison with classical Monte Carlo (MC) calculations. Numerical simulations show that the cases of strong exchange and strong charge correlation differ qualitatively. For a strong exchange, the AFM phase is unstable with respect to the phase separation (PS) into the charge and spin subsystems, which behave like immiscible quantum liquids. An analytical expression was obtained for the PS temperature. 14 pages, 3 figures |
| Databáze: | OpenAIRE |
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