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Conduction-electron localized-moment interaction in palladium-silicon base amorphous alloys containing transition metals

Citation

Hasegawa, Ryusuke (1969) Conduction-electron localized-moment interaction in palladium-silicon base amorphous alloys containing transition metals. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechTHESIS:07182014-141610391

Abstract

The electrical and magnetic properties of amorphous alloys obtained by rapid quenching from the liquid state have been studied. The composition of these alloys corresponds to the general formula MxPd80-xSi20, in which M stands for a metal of the first transition series between chromium and nickel and x is its atomic concentration. The concentration ranges within which an amorphous structure could be obtained were: from 0 to 7 for Cr, Mn and Fe, from 0 to 11 for Co and from 0 to 15 for Ni. A well-defined minimum in the resistivity vs temperature curve was observed for all alloys except those containing nickel. The alloys for which a resistivity minimum was observed had a negative magnetoresistivity approximately proportional to the square of the magnetization and their susceptibility obeyed the Curie-Weiss law in a wide temperature range. For concentrated Fe and Co alloys the resistivity minimum was found to coexist with ferromagnetism. These observations lead to the conclusion that the present results are due to a s-d exchange interaction. The unusually high resistivity minimum temperature observed in the Cr alloys is interpreted as a result of a high Kondo temperature and a large s-d exchange integral. A low Fermi energy of the amorphous alloys (3.5 eV) is also responsible for the anomalies due to the s-d exchange interaction.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Materials Science
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Materials Science
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Duwez, Pol E. (advisor)
  • Tsuei, C. C. (co-advisor)
Thesis Committee:
  • Unknown, Unknown
Defense Date:9 May 1969
Record Number:CaltechTHESIS:07182014-141610391
Persistent URL:http://resolver.caltech.edu/CaltechTHESIS:07182014-141610391
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8567
Collection:CaltechTHESIS
Deposited By: Benjamin Perez
Deposited On:18 Jul 2014 21:40
Last Modified:18 Jul 2014 21:40

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