Fragmented monopole crystal, dimer entropy, and Coulomb interactions in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Dy</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Ir</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math>

Cathelin, V.; Robert, J.; Guruciaga, Pamela C.; Paulsen, C.; Prabhakaran, D.; Léjay, P.; Damay, F.; Ollivier, Jacques; Fåk, B.; Chapon, Laurent; Ballou, R.; Simonet, Virginie; Holdsworth, Peter; Lhotel, Elsa

doi:10.1103/physrevresearch.2.032073

Cited by 26 publications

(43 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…More recently, it was shown that Dy 2 Ir 2 O 7 also stabilizes a fragmented phase, with almost the same characteristics as the Ho compound [84]. The specific heat measurements performed in this compound could confirm the existence of a residual entropy, in agreement with the theoretical predictions [26].…”

Section: Pyrochlore Iridatessupporting

confidence: 74%

Fragmentation in Frustrated Magnets: A Review

2020

View full text Add to dashboard Cite

Spin liquids are exotic phases of matter that often support emergent gauge fields and quasi-particle excitations. While spin liquids are commonly known for remaining disordered, their definition has been extended to include phases with broken symmetry corresponding to (partial) long-range order, such as chiral and nematic spin liquids for example. For Coulomb spin liquids, this ordering can be quantitatively understood via a Helmholtz decomposition between divergence-free and divergencefull terms. This phenomenon has been coined fragmentation, where spin degrees of freedom fragment into two components: the fluctuating disordered part and the ordered one. In this review, we will cover the theoretical and experimental aspects of this growing field, in particular its relation to magnetic monopoles in spin ice, its phase diagram and the possibility to observe it in solid-state crystal and artificial networks.

show abstract

Section: Pyrochlore Iridatessupporting

confidence: 74%

Fragmentation in Frustrated Magnets: A Review

2020

View full text Add to dashboard Cite

show abstract

“…This approximation likely accounts for the contrast between the smooth experimental curves and step-like behaviour of the simulations. Our proposed mechanism is consistent with the recent experimental results observed for Dy 2 Ir 2 O 7 15 , in which the authors comment that the absence of the expected magnetisation plateau could arise from a partially frozen mosaic of iridium domains.…”

Section: Resultssupporting

confidence: 92%

“…For the Ir order that exists below 80 K there are two possible domains, denoted type A and type B (referred to elsewhere as AIAO and AOAI) 15,20,21 . The diagrams in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…A [100] field stabilises a specific monopole-free 2I2O ground state, whereas a sufficiently large [111] field promotes the formation of magnetic monopoles, arranging the rare-earth moments into a 3I1O/1I3O monopole crystal. The experimental study of this anisotropic behaviour requires measurements on single crystals, something which has only become possible very recently for the pyrochlore iridates 15 .…”

mentioning

confidence: 99%

See 1 more Smart Citation

Magnetic monopole density and antiferromagnetic domain control in spin-ice iridates

et al. 2022

Self Cite

View full text Add to dashboard Cite

Magnetically frustrated systems provide fertile ground for complex behaviour, including unconventional ground states with emergent symmetries, topological properties, and exotic excitations. A canonical example is the emergence of magnetic-charge-carrying quasiparticles in spin-ice compounds. Despite extensive work, a reliable experimental indicator of the density of these magnetic monopoles is yet to be found. Using measurements on single crystals of Ho2Ir2O7 combined with dipolar Monte Carlo simulations, we show that the isothermal magnetoresistance is highly sensitive to the monopole density. Moreover, we uncover an unexpected and strong coupling between the monopoles on the holmium sublattice and the antiferromagnetically ordered iridium ions. These results pave the way towards a quantitative experimental measure of monopole density and demonstrate the ability to control antiferromagnetic domain walls using a uniform external magnetic field, a key goal in the design of next-generation spintronic devices.

show abstract

“…Alternatively, this phase can be understood through the superposition of two components: an ordered, divergence-full "all-in-all-out" (AIAO) component and a divergence-free "two-in-two-out" component, which remains fluctuating and provides a gain in entropy [17]. Experimental realizations of such "ground-state moment fragmentation" have been demonstrated in the tripod Kagome 2469-9950/2021/103(21)/214419 (11) 214419-1 ©2021 American Physical Society materials RE 3 Mg 2 Sb 3 O 14 (RE = Dy [18], Ho [19]) and via a staggered magnetic field in the iridate pyrochlores RE 2 Ir 2 O 7 (RE = Dy [20], Ho [21]).…”

Section: Introductionmentioning

confidence: 99%

Absence of moment fragmentation in the mixed B -site pyrochlore Nd2GaSbO7

et al. 2021

View full text Add to dashboard Cite

Nd-based pyrochlore oxides of the form Nd 2 B 2 O 7 have garnered a significant amount of interest owing to the moment fragmentation physics observed in Nd 2 Zr 2 O 7 and speculated in Nd 2 Hf 2 O 7 . Notably this phenomenon is not ubiquitous in this family, as it is absent in Nd 2 Sn 2 O 7 , which features a smaller ionic radius on the B site. Here, we explore the necessary conditions for moment fragmentation in the Nd pyrochlore family through a detailed study of the mixed B-site pyrochlore Nd 2 GaSbO 7 . The B site of this system is characterized by significant disorder and an extremely small average ionic radius. Similarly to Nd 2 Sn 2 O 7 , we find no evidence for moment fragmentation through our bulk characterization and neutron scattering experiments, indicating that chemical pressure (and not necessarily the B-site disorder) plays a key role in the presence or absence of this phenomenon in this material family. Surprisingly, the presence of significant B-site disorder in Nd 2 GaSbO 7 does not generate a spin-glass ground state and instead the same all-in-all-out magnetic order identified in other Nd pyrochlores is found here.

show abstract

Fragmented monopole crystal, dimer entropy, and Coulomb interactions in Dy2Ir2O7

Cited by 26 publications

References 45 publications

Fragmentation in Frustrated Magnets: A Review

Fragmentation in Frustrated Magnets: A Review

Magnetic monopole density and antiferromagnetic domain control in spin-ice iridates

Absence of moment fragmentation in the mixed B -site pyrochlore Nd2GaSbO7

Contact Info

Product

Resources

About