### Session J27: Focus Session: Triangular Lattice

11:15 AM–2:15 PM, Tuesday, March 11, 2008
Morial Convention Center Room: 219

Sponsoring Unit: GMAG
Chair: Andrew Cornelius, University of Nevada, Las Vegas

Abstract ID: BAPS.2008.MAR.J27.1

### Abstract: J27.00001 : Mean filed study of disordered spin-$1\over 2$ antiferromagnetic systems

11:15 AM–11:27 AM

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#### Authors:

Vladimir Dobrosavljevic
(Florida State University)

Sen Zhou
(Florida State University)

Eduardo Miranda
(Universidade Estadual de Campinas)

We present a mean filed theory picture of disordered spin-$1\over 2$ antiferromagnetic system as a function of the degree of disorder, in connection to the insulating doped semiconductors. The system is a resonant valence bond (RVB) liquid state at zero disorder, and a possible RVB glass state when the disorder is finite but weak. For a highly disordered system, we show that the essential physics is the formation and decimation of strongly coupled bonds, and the thermodynamics shows an effective power-law singularity, in qualitative agreement with renormalization group result of Bhatt and Lee.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.MAR.J27.1