Origin of the Spin-Orbital Liquid State in a Nearly J=0 Iridate Ba3ZnIr2O9

We show using detailed magnetic and thermodynamic studies and theoretical calculations that the ground state of Ba3ZnIr2O9 is a realization of a novel spin-orbital liquid state. Our results reveal that Ba3ZnIr2O9 with Ir5+ (5d(4)) ions and strong spin-orbit coupling (SOC) arrives very close to the elusive J = 0 state but each Ir ion still possesses a weak moment. Ab initio density functional calculations indicate that this moment is developed due to superexchange, mediated by a strong intradimer hopping mechanism. While the Ir spins within the structural Ir2O9 dimer are expected to form a spin-orbit singlet state (SOS) with no resultant moment, substantial frustration arising from interdimer exchange interactions induce quantum fluctuations in these possible SOS states favoring a spin-orbital liquid phase down to at least 100 mK

The BACSA family trees

SIGLEAvailable from British Library Document Supply Centre-DSC:m02/37885 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Catalogue of Urdu books in the India Office Library 1800-1920 (Supplementary to James Fuller Blumhardt's catalogue of 1900)

Printed in an edition of 250 copies; first ed. pub. 1982SIGLEAvailable from British Library Document Supply Centre- DSC:GPC/01245 / BLDSC - British Library Document Supply Centre2. edGBUnited Kingdo

Boundary Waters Treaty

The treaty provides the principles and mechanisms to help resolve disputes and to prevent future ones, primarily those concerning water quantity and water quality along the boundary between Canada and the United States