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SUMMARY:Structure-dependent ferromagnetism in Au4V: Investigations into ma
 gnetic gold - Damon D Jackson\, Lawrence Livermore National Laboratory
DTSTART:20071128T111500Z
DTEND:20071128T121500Z
UID:TALK8495@talks.cam.ac.uk
CONTACT:Michael Sutherland
DESCRIPTION:When small amounts of vanadium (<30%) are alloyed into gold\, 
 the vanadium carries a magnetic moment.  Investigations into the electrica
 l resistivity have shown that for vanadium concentrations less than 1%\, t
 he resistivity decreases to a minimum at about 20 K \ndue to the Kondo eff
 ect\, indicating the presence of a localized magnetic moment.  In 1967\, C
 reveling\, Luo\, and Knapp discovered that under the proper annealing cond
 itions\, the vanadium ions of Au-20%V become crystallographical ordered\, 
 forming Au4V\, a ferromagnet with TC=45 K.  We have investigated the natur
 e of this ferromagnetic phase through high pressure electrical resistivity
 .  First\, insight into the strength of the magnetic coupling can be obtai
 ned through measurements of the change in the Kondo effect of Au-0.5%V.  N
 ext\, \nthe Curie temperature of Au4V can be mapped out through electrical
  resistivity using designer diamond anvils\, a unique tool in ultra-high p
 ressure physics.  Finally\, x-ray diffraction measurements have been used 
 to determine the equation of state for Au4V. Combining these results shows
  that the pressure-induced increase of the Curie temperature in Au4V can b
 e explained by an increase in the magnetic exchange interaction as well as
  the number of magnetic nearest neighbors.\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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