Session Y29: Focus Session: Spin Liquids
8:00 AM–11:00 AM, Friday, March 20, 2009
Room: 333
Sponsoring Unit:
GMAG
Chair: Tsuyoshi Kimura, Osaka University
Abstract ID: BAPS.2009.MAR.Y29.6
Abstract: Y29.00006 : $^{69,71}$Ga NMR Probe of the Spin Dynamics in the Rare-Earth Kagom\'{e} Pr$_3$Ga$_5$SiO$_{14}$
9:00 AM–9:12 AM
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Abstract 
Authors:
Lloyd Lumata
(Department of Physics and National High Magnetic Field Laboratory, Florida State University)
K.-Y. Choi
(Department of Physics, Chung-Ang University, Seoul, South Korea)
T. Besara
(NHMFL/FSU)
M. J. R. Hoch
(NHMFL/FSU)
H. D. Zhou
(NHMFL/FSU)
J. S. Brooks
(NHMFL/FSU)
P. L. Kuhns
(NHMFL/FSU)
A. P. Reyes
(NHMFL/FSU)
N. S. Dalal
(NHMFL/FSU)
C. R. Wiebe
(NHMFL/FSU)
We report $^{69,71}$Ga nuclear magnetic resonance investigation of the spin dynamics in the rare-earth kagom\'{e} system Pr$_3$Ga$_5$SiO$_{14}$. We find that the spin-lattice relaxation rate $^{69}1/T_1$ exhibits a peak around 30 K, below which the Pr$^{3+}$ spin correlation time $\tau$ shows novel field-dependent behavior consistent with a field-dependent gap in the excitation spectrum. The spin-spin relaxation rate $^{69}1/T_{2}$ exhibits a maximum at a lower temperature (10 K) below which field-dependent power-law behavior close to $T^{2}$ is observed. These results point to the interplay of single-ion anisotropy and field-induced formation of nanoscale magnetic clusters consistent with recent neutron scattering measurements.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2009.MAR.Y29.6