Session H8: Focus Session: Frustrated Magnetism - Kagome I
8:00 AM–11:00 AM, Tuesday, February 28, 2012
Room: 208
Sponsoring Units:
DMP GMAG
Chair: Peter Schiffer, Pennsylvania State University
Abstract ID: BAPS.2012.MAR.H8.4
Abstract: H8.00004 : Investigation of fermi-liquid-like specific heat and spin-density-wave signatures in the distorted kagome compound Volborthite, Cu$_3$V$_2$O$_7$(OH)$_2$$\cdot2$H$_2$O
9:00 AM–9:12 AM
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Abstract 
Authors:
Tyler Dodds
(University of Toronto)
Yong Baek Kim
(University of Toronto)
The distorted kagome compound Volborthite shows signatures of spin-density-wave magnetic order and Fermi-liquid specific heat at low temperatures and magnetic fields. A recent density functional study [O. Janson {\it et al}., Phys. Rev. B {\bf{82}}, 104434 (2010)] suggests that Volborthite can be viewed as coupled frustrated Heisenberg spin chains, a model we approach using a slave-fermion representation of the spins. For a certain range of couplings, our mean-field theory finds a Fermi surface of spinons, a portion of which contains nesting. We investigate whether the coexistence of a U(1) spin liquid with a spinon Fermi surface, along with a spinon spin-density-wave, may describe the aforementioned features of the low-field phase. Furthermore, at higher fields, conventional magnetically ordered states are found. We examine if higher magnetic fields can lead to the destruction of the fermi surface, prompting a spinon confinement transition into such a conventionally magnetically ordered state.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.MAR.H8.4