Accession Number : AD0710297

Title :   KONDO EFFECT IN DILUTE ALLOYS.

Descriptive Note : Final rept.,

Corporate Author : CITY COLL NEW YORK DEPT OF PHYSICS

Personal Author(s) : Sarachik,Myriam P.

Report Date : 27 JUL 1970

Pagination or Media Count : 8

Abstract : An investigation of Pd containing Mn or Gd showed that some of Kondo's predictions did not hold for these systems (B) Measurements were made of the magnetostriction and the pressure dependence of the Curie temperature in dilute Pd-Fe alloys. (C) A systematic investigation of Ru, Ru-Rh, Rh and Rh-Pd alloys containing Fe showed that anomalous resistivity occurred throughout this system, and that the Knapp two-band model could not correctly account for the measured properties. (D) A series of careful experiments on Os-Ir, Ir and Ir-Pt alloys over an extended temperature range produced results which have led Kaiser and Doniach to formulate a theory for scattering of conduction electrons from localized spin fluctuations. (E) Measurements for Co dissolved in Mo-Nb alloys showed that the Kondo temperature did not vary exponentially as expected on simple theoretical grounds. (F) Resistance minima and negative magnetopresistances at low temperatures were observed in Ni-Cu alloys, and are probably caused by spin-flip scattering of conduction electrons from the giant polarization clouds which are known to exist in these systems. (G) Theoretical predictions of anomalous behavior of the Hall coefficient in Kondo systems have been confirmed (for the first time) in the Cu-Au-Fe system, thus providing important additional evidence for the existence of the low temperature quasi-bound state. (Author)

Descriptors :   (*ELECTRICAL RESISTANCE, ALLOYS), IRON ALLOYS, PALLADIUM ALLOYS, RUTHENIUM ALLOYS, RHODIUM ALLOYS, OSMIUM ALLOYS, IRIDIUM ALLOYS, PLATINUM ALLOYS, MOLYBDENUM ALLOYS, NIOBIUM ALLOYS, NICKEL ALLOYS, COPPER ALLOYS, GOLD ALLOYS, ANOMALIES, MAGNETIC PROPERTIES

Subject Categories : Electricity and Magnetism
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE