Post-perovskite CaIrO3: Aj=1/2quasi-one-dimensional antiferromagnet
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چکیده
منابع مشابه
Post-perovskite CaIrO3: A j = 1/2 quasi-one-dimensional antiferromagnet
The 5d5 iridate CaIrO3 is isostructural with the post-perovskite phase ofMgSiO3, recently shown to occur under extreme pressure in the lower Earth’smantle. It therefore serves as an analog of post-perovskiteMgSiO3 for awide variety of measurements at ambient conditions or achievable with conventional multianvile pressure modules. By multireference configuration-interaction calculations we here ...
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Recent experiments have shown that the perovskite to post-perovskite phase transformation in CaIrO3 occurs more readily at room temperature when a shear stress is applied as compared to isotropic pressure. To understand this mechanistically, we have calculated the minimum-energy pathway of the phase transition with density functional theory under different pressure conditions with the generaliz...
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At near ambient conditions, CaIrO3 is isostructural with the high-pressure polymorph MgSiO3 “post-perovskite” (pPv). MgSiO3 pPv is thought to be a major phase in the earth's lowermost mantle. CaIrO3 can thus serve as an analog for studying deformation of the pPv phase under conditions achievable with a multi-anvil deformation apparatus. Here we study the rheologic behavior of CaIrO3 pPv at a va...
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Single crystals of the title compound, the post-perovskite-type CaIrO3 [calcium iridium(IV) trioxide], have been grown from a CaCl2 flux at atmospheric pressure. The crystal structure consists of an alternate stacking of IrO6 octa-hedral layers and CaO8 hendeca-hedral layers along [010]. Chains formed by edge-sharing of IrO6 octa-hedra (point-group symmetry 2/m..) run along [100] and are inter-...
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Magnetic susceptibility and specific heat measurements in magnetic fields were performed on an S = 1/2 one-dimensional antiferromagnet KCuGaF6. Exchange interaction was evaluated as J/kB ≃ 100 K. However, no magnetic ordering was observed down to 0.46 K. It was found that an applied magnetic field induces a staggered magnetic susceptibility obeying the Curie law and an excitation gap, both of w...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 2012
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.85.235147