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Relaxation in the spin ice Dy2Ti2O7 studied using nuclear forward scattering

DOI: 10.1103/PhysRevB.75.140402 DOI Help

Authors: John Sutter (Diamond Light Source) , Satoshi Tsutsui (SPring-8/JASRI, Japan) , Ryuji Higashinaka (Department of Physics, Kyoto University, Japan) , Yoshiteru Maeno (Department of Physics, Kyoto University, Japan) , Olaf Leupold (HASYLAB at DESY, Germany) , Alfred Baron (SPring-8/JASRI, Japan)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 75 (14)

State: Published (Approved)
Published: April 2007

Abstract: The spin dyanmics of Dy2Ti2O7 from 8 to 287.3 K has been investigated using forward scattering of synchrotron radiation from the 25.65 - KeV resonance of 161 Dy nuclei. The impulse response was measured using a fast (200 ps) and efficient detector, allowing determination of the hyperfine fields between 8 and 90 K. While the field magnitudes remains nearly constant, the relaxtion shows an Arrhenius behaviour. The activation energy Ea=271.9 ±8.1 K agrees well with other spin ices, suggesting similar crystal fields. However the relaxtion time R0=15.76 (-2.53) (+3.03) ps is about triple that of the Ho spin ices, reflecting the different nearest neighbour exchange interactions.

Subject Areas: Chemistry

Facility: SPring-8

Added On: 28/07/2010 08:57

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