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The geometrically frustrated double perovskite Ba2YRuO6 has magnetic 4d3 Ru5+ions decorating an undistorted face-centered cubic (FCC) lattice. This materialhas been previously reported to exhibit commensurate long-rangeantiferromagnetic order below T_N = 36K, a factor f = 15 times lower than itsCurie-Weiss temperature Theta_CW = -522 K, and purported short-range order toT* = 47K. We report new time-of-flight neutron spectroscopy of Ba2YRuO6 whichshows the development of a 5 meV spin gap in the vicinity of the [100] magneticordering wavevector below T_N = 36K, with the transition to long-range orderoccurring at T* = 47K. We also report spin waves extending to 14 meV, asurprisingly small bandwidth in light of the large Theta_CW. We compare thespin gap and bandwidth to relevant neutron studies of the isostructural 4d1material Ba2YMoO6,and discuss the results in the framework of relatively strongspin-orbit coupling expected in 4d magnetic systems.

Spin Gap and the Nature of the 4d3 Magnetic Ground State in the Frustrated FCC Antiferromagnet Ba2YRuO6