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

Abstract

The geometrically frustrated double perovskite Ba2YRuO6 has magnetic 4d3 Ru5+ ions decorating an undistorted face-centered cubic (FCC) lattice. This material has been previously reported to exhibit commensurate long-range antiferromagnetic order below T_N = 36K, a factor f = 15 times lower than its Curie-Weiss temperature Theta_CW = -522 K, and purported short-range order to T* = 47K. We report new time-of-flight neutron spectroscopy of Ba2YRuO6 which shows the development of a 5 meV spin gap in the vicinity of the [100] magnetic ordering wavevector below T_N = 36K, with the transition to long-range order occurring at T* = 47K. We also report spin waves extending to 14 meV, a surprisingly small bandwidth in light of the large Theta_CW. We compare the spin gap and bandwidth to relevant neutron studies of the isostructural 4d1 material Ba2YMoO6,and discuss the results in the framework of relatively strong spin-orbit coupling expected in 4d magnetic systems.

6 pages, 7 figures, Accepted to Physical Review B

References in corpus (10)

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• Long-Range Magnetic Order in the 5d^2 Double Perovskite Ba2CaOsO6: Comparison with Spin-Disordered Ba2YReO6
• Magnetic order and electronic structure of 5d3 double perovskite Sr2ScOsO6
• Spin-orbit coupling controlled ground state in Sr${}_2$ScOsO${}_6$
• Highly-anisotropic exchange interactions of $j_{\mathrm{eff}}=1/2$ iridium moments on the fcc lattice in La${}_{2}B$IrO${}_6$ ($B$ $=$ Mg, Zn)
• Exotic magnetism on the quasi-FCC lattices of the $d^3$ double perovskites La${}_2$NaB${}^{\prime }$O${}_6$ (B${}^{\prime }$ $=$ Ru, Os)
• Spin wave excitations in the tetragonal double perovskite Sr${}_2$CuWO${}_6$
• Spin-orbit coupling control of anisotropy, ground state and frustration in 5d2 Sr2MgOsO6
• Origin of magnetic excitation gap in double perovskite Sr${}_2$FeOsO${}_6$
• Muon spin rotation and neutron scattering investigations of the B-site ordered double perovskite Sr2DyRuO6
• Realization of the orbital-selective Mott state at the molecular level in Ba${}_3$LaRu${}_2$O${}_9$
• Hidden orders in spin-orbit entangled correlated insulators
• Spin gaps in the ordered states of La${}_2$LiXO${}_6$ (X = Ru, Os) and their relation to distortion of the cubic double perovskite structure in 4$d^3$ and 5$d^3$ magnets
• Disorder driven cluster glass state in a geometrically frustrated hexagonal perovskite
• Multipolar interactions and magnetic excitation gap in d${}^3$ spin-orbit Mott insulators
• Time-of-flight elastic and inelastic neutron scattering studies on the localized $4d$ electron layered perovskite La${}_5$Mo${}_4$O${}_{16}$
• Electronic and magnetic ground state of 4$d^3$ double perovskite ruthenates A${}_2$LaRuO${}_6$ (A $=$ Ca, Sr, Ba)