Peer-reviewedCC BY-NC-ND 4.0Physical Review B
Ferromagnetic fragmented state in the pyrochlore Ho₂Ru₂O₇
Abstract
The consecutive magnetic ordering of the Ho and Ru ions in the pyrochlore Ho₂Ru₂O₇ and their interplay are investigated by neutron scattering, magnetic, and specific heat measurements. The Ru moments order at 95 K into a Γ₅ easy-plane antiferromagnetic state. At 1.55 K, the Ho moments order into an unusual Γ₉ ferromagnetic state with extensive ground state entropy and structured spin dynamics. It is shown how the internal fields with Γ₅ and Γ₉ geometry allow for two symmetry breaking transitions. The lower temperature ordering is driven by ruthenium mediated interactions between holmium moments as spin ice correlations develop. The unsaturated order is compatible with a fragmented ferromagnetic state equivalent to pyrochlore kagome ice.
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BibTeX
@article{museur2026ferromagnetic,
title = {{Ferromagnetic fragmented state in the pyrochlore Ho₂Ru₂O₇}},
author = {F. Museur and J. Robert and F. Morineau and N. Bujault and V. Simonet and E. Pachoud and Abdellali Hadj-Azzem and C. Colin and L. Mangin-Thro and P. Manuel and J. Stewart and P. Holdsworth and E. Lhotel},
journal = {Physical Review B},
year = {2026},
month = oct,
doi = {10.1103/dzdf-hh4t},
eprint = {2411.10078},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05845578v1},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - JOUR
TI - Ferromagnetic fragmented state in the pyrochlore Ho₂Ru₂O₇
AU - F. Museur
AU - J. Robert
AU - F. Morineau
AU - N. Bujault
AU - V. Simonet
AU - E. Pachoud
AU - Abdellali Hadj-Azzem
AU - C. Colin
AU - L. Mangin-Thro
AU - P. Manuel
AU - J. Stewart
AU - P. Holdsworth
AU - E. Lhotel
PY - 2026
DA - 2026/10/30
JO - Physical Review B
DO - 10.1103/dzdf-hh4t
UR - https://hal.science/hal-05845578v1
AB - The consecutive magnetic ordering of the Ho and Ru ions in the pyrochlore Ho₂Ru₂O₇ and their interplay are investigated by neutron scattering, magnetic, and specific heat measurements. The Ru moments order at 95 K into a Γ₅ easy-plane antiferromagnetic state. At 1.55 K, the Ho moments order into an unusual Γ₉ ferromagnetic state with extensive ground state entropy and structured spin dynamics. It is shown how the internal fields with Γ₅ and Γ₉ geometry allow for two symmetry breaking transitions. The lower temperature ordering is driven by ruthenium mediated interactions between holmium moments as spin ice correlations develop. The unsaturated order is compatible with a fragmented ferromagnetic state equivalent to pyrochlore kagome ice.
SN - 2469-9950
SN - 2469-9969
ER -