Frustrated spin correlations in diluted spin ice Ho2-xLaxTi2O7

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We have studied the evolution of the structural properties as well as the static and dynamic spin correlations of spin ice Ho2Ti2O7, where Ho was partially replaced by non-magnetic La. The crystal structure of diluted samples Ho2-xLaxTi2O7 was characterized by x-ray and neutron diffraction and by Ho L-III-edge and Ti K-edge extended x-ray absorption fine structure (EXAFS) measurements. It is found that the pyrochlore structure remains intact until about x = 0.3, but a systematic increase in local disorder with increasing La concentration is observed in the EXAFS data, especially from the Ti K edge.Quasi-elastic neutron scattering and ac susceptibility ... continued below

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Ehlers, Georg; Ehlers, G.; Mamontov, E.; Zamponi, M.; Faraone, A.; Qiu, Y. et al. April 30, 2008.

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We have studied the evolution of the structural properties as well as the static and dynamic spin correlations of spin ice Ho2Ti2O7, where Ho was partially replaced by non-magnetic La. The crystal structure of diluted samples Ho2-xLaxTi2O7 was characterized by x-ray and neutron diffraction and by Ho L-III-edge and Ti K-edge extended x-ray absorption fine structure (EXAFS) measurements. It is found that the pyrochlore structure remains intact until about x = 0.3, but a systematic increase in local disorder with increasing La concentration is observed in the EXAFS data, especially from the Ti K edge.Quasi-elastic neutron scattering and ac susceptibility measurements show that, in x<= 0.4 samples at temperatures above macroscopic freezing, the spin -spin correlations are short ranged and dynamic in nature. The main difference with pure spin ice in the dynamics is the appearance of a second, faster, relaxation process.

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  • Journal Name: Journal of Physics: Condensed Matter; Journal Volume: 20; Journal Issue: 23; Related Information: Journal Publication Date: 2008

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  • Report No.: LBNL-620E
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1088/0953-8984/20/23/235206 | External Link
  • Office of Scientific & Technical Information Report Number: 934970
  • Archival Resource Key: ark:/67531/metadc899898

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  • April 30, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Oct. 3, 2016, 4:17 p.m.

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Ehlers, Georg; Ehlers, G.; Mamontov, E.; Zamponi, M.; Faraone, A.; Qiu, Y. et al. Frustrated spin correlations in diluted spin ice Ho2-xLaxTi2O7, article, April 30, 2008; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc899898/: accessed December 9, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.