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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Absence of spin-ice state in the disordered fluorite Dy2Zr2O7

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Ramon, J. G. A. [1] ; Wang, C. W. [2] ; Ishida, L. [1, 3] ; Bernardo, P. L. [1] ; Leite, M. M. [4] ; Vichi, F. M. [4] ; Gardner, J. S. [5] ; Freitas, R. S. [1]
Total Authors: 8
[1] Univ Sao Paulo, Inst Fis, BR-05314970 Sao Paulo, SP - Brazil
[2] Natl Synchrotron Radiat Res Ctr, Neutron Grp, Hsinchu 30076 - Taiwan
[3] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP - Brazil
[4] Univ Sao Paulo, Inst Quim, BR-05508000 Sao Paulo, SP - Brazil
[5] Songshan Lake Mat Lab, Dongguan 523808, Guangdong - Peoples R China
Total Affiliations: 5
Document type: Journal article
Source: Physical Review B; v. 99, n. 21 JUN 27 2019.
Web of Science Citations: 0

Neutron scattering, ac magnetic susceptibility, and specific-heat studies have been carried out on polycrystalline Dy2Zr2O7. Unlike the pyrochlore spin ice Dy2Ti2O7, Dy2Zr2O7 crystallizes into the fluorite structure and the magnetic Dy3+ moments randomly reside on the corner-sharing tetrahedral sublattice with nonmagnetic Zr ions. Antiferromagnetic spin correlations develop below 10 K but remain dynamic down to 40 mK, with a significant amount of magnetic susceptibility. These correlations extend over the length of two tetrahedra edges and grow to six nearest neighbors with the application of a 20-kOe magnetic field. Magnetic heat capacity revealed a correlation peak at 2 K, but no Pauling's residual entropy was observed. We propose that the disorder precludes the development of spin-ice correlations seen in the chemically ordered Dy2Ti2O7 compound, with fluctuating spins in a disordered, liquidlike state (albeit slow) which do not freeze into a canonical spin-glass state that one might intuitively expect. (AU)

FAPESP's process: 15/16191-5 - The research in new materials involving high magnetic fields and low temperatures
Grantee:Gennady Gusev
Support type: Research Projects - Thematic Grants
FAPESP's process: 11/19941-4 - Luminescent silicate nanostructures via non conventional synthesis routes
Grantee:Flávio Maron Vichi
Support type: Regular Research Grants