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Chemical Potential as a Detector of Phase Transitions in Solids

100%

Matlak M., Gosławska E., Grabiec B., Eid K.

We show that the chemical potential exhibits small but distinct kinks at all critical temperatures as the evidence for phase transitions in the electronic system, structural phase transitions included. In the case of, at least, two kinds of interacting electrons average occupation numbers exhibit the same behavior.

Phase Transitions in Magnetic and Superconducting Systems with Fluctuating Valence. Chemical Potential Evidence

100%

Gosławska E., Matlak M., Eid K.

Acta Physica Polonica A

2000

vol. 97

issue 4

713-718

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.

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2 Acta Physica Polonica A

2 2000

2 Eid K.

2 Gosławska E.

2 Matlak M.

1 Grabiec B.

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Chemical Potential as a Detector of Phase Transitions in Solids

Phase Transitions in Magnetic and Superconducting Systems with Fluctuating Valence. Chemical Potential Evidence