Resistivity anomalies for ferromagnetic metals at Curie points

<p>We have investigated the resistivity anomalies of ferromagnetic metals at the Curie point using the itinerant model. The nature of these resistivity anomalies is related to phase transitions of second kind. Current theory describing these anomalies is based on the localized model of the magnetic electrons in ferromagnetic metals. There is an ansatz in solid state physics that if the magneto-resistance can be explained by the realistic itinerant model, the localized model should give the same result.</p> <p>In this work, we use the itinerant model to treat the spin correlation function. Using the second quantization techniques of field theory, the correlation function is found. Thence, the scattering cross section is obtained. Based on transport theory, the relaxation time and the resistivity are calculated for both the paramagnetic and the ferromagnetic regions. The temperature derivatives of the resistivity are then derived for temperatures approaching the Curie temperature from both below and above. Our results are exactly the same as obtained by the localized model, namely, positive infinite for T approaching T_c from below and negative infinite for T approaching T_c from above. Therefore, our itinerant model calculation confirms the above ansatz.</p>

Name thesis:degree_name

Doctor of Philosophy (PhD)

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Year

1974

Author dc:creator

• Su, Der-Ruenn

Contributors dc:contributor

• Tsu-ming Wu
• Newton I. Greenberg
• Robert L. Pompi

• Ferromagnetism
• Magnetoresistance
• Paramagnetism
• Curie temperature

Repository record dc:identifier

https://orb.binghamton.edu/dissertation_and_theses/242

OAI identifier oai:identifier

oai:orb.binghamton.edu:dissertation_and_theses-1248