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Abstracts
We investigate the critical behaviour of the chemical potential and average occupation numbers using the extended s -f model with intersite Cooper pairing for systems with fluctuating valence. The model is able to describe phase transitions from normal ferromagnet to normal paramagnet at T=T_{C}, from superconducting paramagnet to normal paramagnet at T=T_{S}, as well as reentrant phase transitions with three critical temperatures T_{S_{1}}, T_{C} and T_{S_{2}} (T_{S_{1}} < T_{C} < T_{S_{2}}). Present investigation, as well as recent results obtained for another models suggest one-to-one correspondence between critical temperatures of the system and kinks appearing in the temperature dependence of the chemical potential and average occupation numbers. This, in turn, indicates a possibility to apply the measurement of the chemical potential vs. temperature as an experimental universal tool when looking for phase transitions in solids.
Discipline
- 75.40.Cx: Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
- 75.30.Kz: Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)(for ferroelectric phase transitions, see 77.80.B-; for superconductivity phase diagrams, see 74.25.Dw)
Journal
Year
Volume
Issue
Pages
713-718
Physical description
Dates
published
2000-04
received
1999-11-18
Contributors
author
- Institute of Physics, Silesian University, Uniwersytecka 4, 40-007 Katowice, Poland
author
- Institute of Physics, Silesian University, Uniwersytecka 4, 40-007 Katowice, Poland
author
- Physics Department, Faculty of Education, Ain-Shams University, Roxy, Cairo, Egypt
References
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv97z410kz