  Quantum spin ice materials, pyrochlore magnets with competing Ising and
transverse exchange interactions, have been widely discussed as candidates for
a quantum spin-liquid ground state. Here, motivated by quantum chemical
calculations for Pr pyrochlores, we present the results of a study for
frustrated transverse exchange. Using a combination of variational
calculations, exact diagonalisation, numerical linked-cluster and series
expansions, we find that the previously-studied U(1) quantum spin liquid, in
its pi-flux phase, transforms into a nematic quantum spin liquid at a
high-symmetry, SU(2) point.
