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We present the results of a combined $^7$Li NMR and diffraction study onLiGa$_{0.95}$In$_{0.05}$Cr$_4$O$_8$, a member ofLiGa$_{1-x}$In$_{x}$Cr$_4$O$_8$ "breathing" pyrochlore family. Via specificheat and NMR measurements, we find that the complex sequence of first-ordertransitions observed for $x=0$ is replaced by a single, apparently second-ordertransition at $T_f=11$ K. Neutron and X-ray diffraction rule out bothstructural symmetry lowering and magnetic long-range order as the origin ofthis transition. Instead, reverse Monte Carlo fitting of the magnetic diffusescattering indicates that the low temperature phase may be described as acollinear spin nematic state, characterized by a quadrupolar order parameter.This state also shows signs of short range order between collinear spinarrangements on tetrahedra, revealed by mapping the reverse Monte Carlo spinconfigurations onto a three-state color model describing the manifold ofnematic states.

Classical Spin Nematic Transition in LiGa$_{0.95}$In$_{0.05}$Cr$_4$O$_8$