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SUMMARY:Fermi surface determination using positron annihilation - Stephen 
 Dugdale\, University of Bristol
DTSTART:20130501T101500Z
DTEND:20130501T111500Z
UID:TALK44596@talks.cam.ac.uk
CONTACT:Helen Verrechia
DESCRIPTION:Positron annihilation is perhaps one of the less well-known me
 thods for measuring the Fermi surface. In this talk\, I will explain how o
 ne can determine the Fermi surface topology of a metallic system using pos
 itrons\, highlighting some of its advantages as well as its limitations. I
  will focus on materials where other probes (such as quantum oscillatory t
 echniques or ARPES) have not been so successful\, as well as materials whe
 re the positron can provide unique information by virtue of where it choos
 es to annihilate.\nI will  describe some recent measurements in the ferrom
 agnetic shape-memory alloy Ni$_{2}$MnGa and in MnSi.\n
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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