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Enhancement of ferroelectricity in Cr-doped Ho_2Ti_2O_7

A series of polycrystalline pyrochlore rare-earth titanate Ho_{2-x}Cr_xTi_2O_7 are synthesized in order to enhance the ferroelectricity of pyrochlore Ho2Ti2O7. For the sample close to the doping level x=0.4, a giant enhancement of polarization P up to 660\muC/m2 from 0.54\muC/m2 at x=0 is obtained, accompanied with an increment of ferroelectric transition point Tc up to ~140K from ~60K. A magnetic anomaly at T~140K together with the polarization response to magnetic field, is identified, implying the multiferroic effect in Ho2-xCrxTi2O7.

preprint2010arXivOpen access
X. W. DongS. DongK. F. WangJ. G. WanJ. -M. Liu
cond-mat.str-elcond-mat.mtrl-sci
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X. W. DongS. DongK. F. WangJ. G. WanJ. -M. Liu

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