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000423238 1001_ $$0P:(DE-H253)PIP1083734$$aYadav, Pramod K.$$b0
000423238 245__ $$aDielectric relaxations in $Ho_{2}Ti_{2}O_{7}$ and $Dy_{2}Ti_{2}O_{7}$ pyrochlores
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000423238 520__ $$aDielectric measurements of $Ho_{2}Ti_{2}O_{7}$ and $Dy_{2}Ti_{2}O_{7}$ cubic pyrochlore show two distinctly defined relaxations around 90K and 36K. The nature and possible origin of these relaxations have been determined. The observed value of critical exponent of Curie-Weiss and Lacroix- Bn equation confirms these relaxations are diffuse and show Debye-like behavior. The order of activation energy of $Ho_{2}Ti_{2}O_{7}$ and $Dy_{2}Ti_{2}O_{7}$ shows that both relaxations are distinctly related with structural distortion at oxygen sites. Temperature-dependent lattice volume shows deviation from Debye-Grüneisen behavior below 70 K, further confirms the structural origin of both relaxations. An underlying crystal field anisotropy induced splitting of multipolar order parameter is the primary cause of both diffuse relaxations in these spin ices. It has been found that dielectric relaxations depend strongly on the crystal field, which provides a tool to fine tune the dielectric properties of these systems.
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000423238 7001_ $$0P:(DE-H253)PIP1015344$$aUpadhyay, Chandan$$b2$$eCorresponding author
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