English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Spin ices, frustrated magnetic materials analogous to common water ice, areexemplars of high frustration in three dimensions. Recent experimental studiesof the low-temperature properties of the paradigmatic Dy$_2$Ti$_2$O$_7$ spinice material, in particular whether the predicted transition to long-rangeorder occurs, raise questions as per the currently accepted microscopic modelof this system. In this work, we combine Monte Carlo simulations and mean-fieldtheory calculations to analyze data from magnetization, elastic neutronscattering and specific heat measurements on Dy$_2$Ti$_2$O$_7$. We alsoreconsider the possible importance of the nuclear specific heat, $C_{\rm nuc}$,in Dy$_2$Ti$_2$O$_7$. We find that $C_{\rm nuc}$ is not entirely negligiblebelow a temperature $\sim 0.5$ K and must be taken into account in aquantitative analysis of the calorimetric data of this compound below thattemperature. We find that small effective exchange interactions compete withthe magnetostatic dipolar interaction responsible for the main spin icephenomenology. This causes an unexpected "refrustration" of the long-rangeorder that would be expected from the incompletely self-screened dipolarinteraction and which positions the material at the boundary between twocompeting classical long-range ordered ground states. This allows for themanifestation of new physical low-temperature phenomena in Dy$_2$Ti$_2$O$_7$,as exposed by recent specific heat measurements. We show that among the fourmost likely causes for the observed upturn of the specific heat at lowtemperature -- an exchange-induced transition to long-range order, quantumnon-Ising (transverse) terms in the effective spin Hamiltonian, the nuclearhyperfine contribution and random disorder -- only the last appears to bereasonably able to explain the calorimetric data.

Refrustration and competing orders in the prototypical Dy2Ti2O7 spin ice material