This title appears in the Scientific Report :
2008
Please use the identifier:
http://dx.doi.org/10.1088/0953-898/20/23/235206 in citations.
Frustrated spin correlations in diluted spin ice Ho_2-x La_x Ti_2 O_7
Frustrated spin correlations in diluted spin ice Ho_2-x La_x Ti_2 O_7
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...
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Personal Name(s): | Ehlers, G. |
---|---|
Mamontov, E. / Zamponi, M. / Faraone, A. / Qiu, Y. / Cornelius, A. L. / Booth, C.H. / Kam, K.C. / LeToquin, R. / Cheetham, A. K. / Gardner, J. S. | |
Contributing Institute: |
JCNS; JCNS Streumethoden; IFF-4 Neutronenstreuung; IFF-5 |
Published in: | Journal of physics / Condensed matter, 20 (2008) S. 235206 |
Imprint: |
Bristol
IOP Publ.
2008
|
Physical Description: |
235206 |
DOI: |
10.1088/0953-898/20/23/235206 |
Document Type: |
Journal Article |
Research Program: |
Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) Kondensierte Materie |
Series Title: |
Journal of Physics: Condensed Matter
20 |
Subject (ZB): | |
Publikationsportal JuSER |
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. |