Anomalous magnetic phase in an undistorted pyrochlore oxide Cd2Os2O7 induced by geometrical frustration

Abstract

We report on the muon spin rotation/relaxation study of a pyrochlore oxide, Cd2Os2O7, which exhibits a metal-insulator (MI) transition at T_{MI}~225 K without structural phase transition. It reveals strong spin fluctuation (>10^8/s) below the MI transition, suggesting a predominant role of geometrical spin frustration amongst Os^{5+} ions. Meanwhile, upon further cooling, a static spin density wave discontinuously develops below T_{SDW}~150 K. These observations strongly suggest the occurrence of an anomalous magnetic transition and associated change in the local spin dynamics in undistorted pyrochlore antiferromagnet.

5 pages, 4 figures

References in corpus (7)

• Superconductivity at 1 K in Cd2Re2O7
• New Pyrochlore Oxide Superconductor RbOs2O6
• Superconductivity in the Correlated Pyrochlore Cd_2Re_2O_7
• New beta-Pyrochlore Oxide Superconductor CsOs2O6
• Unconventional Dynamics in Triangular Heisenberg Antiferromagnet NaCrO2
• Electronic structure of the pyrochlore metals Cd2Os2O7 and Cd2Re2O7
• Correlations and Semimetallic Behaviors in Pyrochlore Oxide Cd2Re2O7

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• All-in/all-out magnetic domains: X-ray diffraction imaging and magnetic field control
• Electronic structure and magnetic properties of NaOsO${}_3$
• Spin superstructure and noncoplanar ordering in metallic pyrochlore magnets with degenerate orbitals
• Frustrated magnetism in the Heisenberg pyrochlore antiferromagnets $A$Yb${}_2$$X$${}_4$ ($A$ = Cd, Mg, $X$ = S, Se)
• Magnetic ground state of pyrochlore oxides close to metal-insulator boundary probed by muon spin rotation
• First-principles studies of spin-orbital physics in pyrochlore oxides
• Pyrochlore Oxide Hg2Os2O7 on Verge of Metal-Insulator Boundary
• Metal-insulator transitions in pyrochlore oxides
• Coupled Spin-Charge-Phonon Fluctuation in the All-In/All-Out Antiferromagnet Cd${}_2$Os${}_2$O${}_7$