Origins of the Quantum Spin Ice state in Pr2Hf2O7
The Quantum Spin Ice (QSI) state, where the two-in-two-out configurations formed by the Ising variables are allowed to tunnel among themselves, is realised in Pr2Hf2O7 based on our last measurements on IN5 (Nature Physics, 14, 711-715 (2018)). The quantum field theory (quantum electrodynamics) that was used to compare with our data, predicts another distinctive feature for this ground state: the suppression of the pinch points, as compared to the sharp anisotropic features observed in classical spin ices, should be progressive as a function of temperature (Phys. Rev. B, 86, 075154 (2012)). We propose to measure this temperature dependence, which will put further limits on the parameters of the theory used to reproduce the experimental data. Moreover, we propose to search for spin-waves in a field-polarised state in order to establish the parameters of the microscopic Hamiltonian that stabilises the zeros-field state. This second part of the experiment is very important as this approached has proved very useful in other rare-earth pyrochlores.
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Romain Sibille; FENNELL Tom; LHOTEL Elsa; OLLIVIER Jacques; PETIT Sylvain and POREE Victor. (2019). Origins of the Quantum Spin Ice state in Pr2Hf2O7. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-05-725
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