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A single crystal of the Co2+ based pyrochlore NaCaCo2F7 was studied byinelastic neutron scattering. This frustrated magnet with quenched exchangedisorder remains in a strongly correlated paramagnetic state down to one 60thof the Curie-Weiss temperature. Below T_f = 2.4 K, diffuse elastic scatteringdevelops and comprises 30 +/- 10% of the total magnetic scattering, as expectedfor J_{eff} = 1/2 moments frozen on a time scale that exceeds \hbar/\deltaE=3.8 ps. The diffuse scattering is consistent with short range XYantiferromagnetism with a correlation length of 16 \AA. The momentum (Q)dependence of the inelastic intensity indicates relaxing XY-likeantiferromagnetic clusters at energies below ~ 5.5 meV, and collinearantiferromagnetic fluctuations above this energy. The relevant XYconfigurations form a continuous manifold of symmetry-related states. Contraryto well-known models that produce this continuous manifold, order-by-disorderdoes not select an ordered state in NaCaCo2F7 despite evidence for weak (~12 %)exchange disorder. Instead, NaCaCo2F7 freezes into short range ordered clustersthat span this manifold.

Static and dynamic XY-like short-range order in a frustrated magnet with exchange disorder