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SUMMARY:Effects of disorder and magnetic fields on certain strongly correl
 ated systems. - Anamitra Mukherjee\, Harish-Chandra Research Institute\, A
 llahabad (India)
DTSTART:20081010T133000Z
DTEND:20081010T143000Z
UID:TALK13438@talks.cam.ac.uk
CONTACT:James Kermode
DESCRIPTION:Broken translation invariance due to presence of spatially flu
 ctuating potentials can lead to interesting effects in the ground state of
  typical strongly correlated systems. In this talk I will focus on a canon
 ical example of strongly correlated system\, manganites and show that depe
 nding on the way the in which the translation invariance is broken\, the e
 ffect on the spin-charge-orbital ordered states\, found in these materials
 \, are drastically different. Using a real space Monte-Carlo technique\, I
  will demonstrate that while homogeneously distributed weak scatterers bre
 ak down the ordered state into a nano-scale glassy state\, the presence of
  strong but dilute scatterers leads to a macroscopic coexistent phases in 
 the ground state. I will discuss the general principle that causes this te
 ndency and show how this principle can be exploited to predict new highly 
 polarizable phase separated states across a range of electron dopings. Nex
 t\, I will discuss a contrasting situation\, where  the ground state of th
 e system is inherently phase separated in the presence of a magnetic field
  without any disorder. Here we will study the fate on the coexistent state
  as the field is hiked up\, with and without disorder being present in the
  system. In the process\, some striking experimental data on magnetic fiel
 d melting of the charge ordered state in manganites will be explained.  I 
 will end by discussing the effects of disorder on the kinetics of this mel
 ting process\, in particular\, the possibility of tuning volumes of coexis
 tent phases by following different trajectories in the relevant parameter 
 space. \n\nRef: Phys. Rev. Lett. vol 99\, 147206 (2007)\;arXiv:0710.2278\;
 arXiv:0801.2054
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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