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PRODID:UW-Madison-Physics-Events
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UID:UW-Physics-Event-2661
DTSTART:20120430T213000Z
DURATION:PT1H0M0S
DTSTAMP:20260316T002611Z
LAST-MODIFIED:20120430T141441Z
LOCATION:5310 Chamberlin
SUMMARY:Formation of Magnetic Microphases in Ca$_3$Co$_2$O$_6$\, R. G.
  Herb Condensed Matter Seminar\, Yoshitomo Kamiya\, Los Alamos Nationa
 l Lab
DESCRIPTION:We study a frustrated quantum Ising model relevant for Ca$
 _3$Co$_2$O$_6$ that comprises a triangular lattice of  weakly-coupled 
 ferromagnetic chains. According to our quantum Monte Carlo simulations
 \, the chains become ferromagnetic and form a three-sublattice "up-up-
 down'' structure below a temperature $T=T_{	ext{CI}}$. In contrast\, l
 ong-period spin-density-wave (SDW) modulations along the chains are st
 abilized for $T_	ext{CI} < T < T_c$ in agreement with recent experimen
 ts by Agrestini et al [1]. Our mean field solutions reveal quasi-conti
 nuous change of the periodicity as a function of $T$\, implying the ex
 istence of metastable states in the SDW phase that explains the very s
 low low-temperature dynamics that has been observed in Ca$_3$Co$_2$O$_
 6$ [2]. Closely related multiferroic materials Lu$_2$MnCoO$_6$ [3] and
  Ca$_3$MnCoO$_6$ [4] will also be discussed.<br>
\n<br>
\nReferences:<
 br>
\n[1] S. Agrestini et al.\, Phys. Rev. Lett.\, 101\, 097207 (2008)
 <br>
\n[2] T. Moyoshi and K. Motoya\, J. Phys. Soc. Jpn.\, 80\, 034701
  (2011)<br>
\n[3] S. Yanez-Vilar et al.\, Phys. Rev. B\, 84\, 134427 (
 2011)<br>
\n[4] Y. J. Jo et al.\, Phys. Rev. B. 79\, 012407 (2009)<br>
URL:https://www.physics.wisc.edu/events/?id=2661
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