Crystal field states in a Quantum Spin Ice]{Crystal field states of Pr${}^{3+}$ in the candidate quantum spin ice Pr${}_2$Sn${}_2$O${}_7$

Abstract

Neutron time-of-flight spectroscopy has been employed to study the crystal-field splitting of Pr${}^{3+}$ in the pyrochlore stannate Pr${}_2$Sn${}_2$O${}_7$. The crystal field has been parameterized from a profile fit to the observed neutron spectrum. The single-ion ground state is a well isolated non-Kramers doublet of ${\Gamma }_3^{+}$ symmetry with a large Ising-like anisotropy, ${\chi }_{zz}/{\chi }_{\perp }\approx 60$ at 10 K, but with a significant admixture of terms $|M_J\ne \pm J>$ which can give rise to quantum zero-point fluctuations. This magnetic state satisfies the requirements for quantum spin ice behavior.

6 pages, 6 figures

References in corpus (3)

• Pyrochlore Photons: The U(1) Spin Liquid in a S=1/2 Three-Dimensional Frustrated Magnet
• Dirac Strings and Magnetic Monopoles in Spin Ice Dy2Ti2O7
• Is the Yb2Ti2O7 pyrochlore a quantum spin ice?

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