Supercriticalilty and the Widom Line in Holmium Titanate
Supercritical phenomena in conventional fluids remains a difficult subject to study experimentally, requiring high temperatures and pressures to realize. An experimental candidate for study of supercritical physics reveals itself in the classical spin ices Dy2Ti2O7 and Ho2Ti2O7, whose well known ground state behavior and zero point entropy is a measurable analogue of diamond lattice water ice. Recent susceptibility measurements of the spin ice Dy2Ti2O7 suggest that the magnetic Coulomb gas of emergent monopoles has an analogous crossover in thermophysical properties in the supercritical region above the well-known liquid-gas critical point, demonstrably similar to the Widom line in conventional supercritical fluids. We propose to study this effect in Ho2Ti2O7, by measuring the evolution of the diffuse scattering across the Widom line. By comparison with susceptibility experiments, and Monte Carlo simulations of both Coulomb gases and spin systems, we aim to achieve a full microscopic understanding of the Widom line.
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Alexandra Turrini; CHRISTIANSEN Troels Lindhal; DOLEZAL Petr; DOUIX Suzie; FENNELL Tom; GARBUS Pelle; JOHNSON Manuel; KIRSCH Andrea; KIRSTE Karsten; MATRAS Dorota and WILDES Andrew. (2017). Supercriticalilty and the Widom Line in Holmium Titanate. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-42-449
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