ReviewEntropy (Basel, Switzerland)2026
Entropic Phenomena in Spin-Ice Materials and Magnetic Monopole Excitations.
Review in Entropy (Basel, Switzerland), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Spin ice provides a canonical setting in which geometric frustration, local constraints, and extensive degeneracy generate nontrivial entropy and emergent quasiparticles. In this review, we examine entropic phenomena in spin-ice materials and related pyrochlore magnets, taking entropy as a unifying theme that connects established spin-ice thermodynamics with recent developments in entropy-driven phases, monopole confinement, and interface-engineered monopole matter. We first review the connection between proton disorder in water ice and the ice-rule manifold of pyrochlore spin ice, including the Pauling residual entropy and its calorimetric observation, and then contrast this classical limit with quantum spin ice and lithographically constructed artificial spin ice. We next discuss pyrochlore iridates, where competition between the intrinsic spin-ice interaction and the Ir-induced local exchange field produces two-in-two-out (2I2O), fragmented, and all-in-all-out (AIAO) states with distinct residual entropies, as well as finite-temperature entropy-enhanced phases near competing ground-state boundaries. We next review emergent magnetic monopoles in spin ice, including monopole creation, Dirac strings, magnetic Coulomb interactions, and key experimental signatures of magnetic charge, current, and noise. Building on this framework, we discuss theoretically proposed two-dimensional magnetic monopole gases at spin-ice/pyrochlore iridate interfaces, where boundary conditions stabilize a net magnetic charge and entropy controls the spatial confinement of the monopole gas. Finally, we consider proposed monopole-based devices, including a magnetic field-controlled monopole transistor and position-based monopole traps. By linking classical residual entropy to entropy-driven phase selection, quasiparticle confinement, and device concepts, this review highlights how entropy can evolve from a thermodynamic signature of frustration into a potential design parameter for emergent magnetic matter.
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