Superstructure, sodium ordering and antiferromagnetism in NaxCoO2 (0.75<x<1.0)
Y.G. Shi, H. C. Yu, C. J. Nie, and J.Q. Li
TL;DR
This study investigates the superstructure, sodium ordering, and antiferromagnetic properties of NaxCoO2 with 0.75<x<1.0, revealing sodium ordering-induced superstructures and antiferromagnetism at low temperatures.
Contribution
It provides detailed TEM analysis linking sodium ordering to superstructure formation and magnetic behavior in NaxCoO2 within this composition range.
Findings
Superstructure with doubled period observed via TEM.
Sodium ordering occurs at low temperatures.
Antiferromagnetic order with TN~4K detected.
Abstract
Transmission-electron-microscopy investigation reveals the presence of a superstructure with a doubled period of 2d110 in the NaxCoO2 materials for x ranging from 0.75 to 1.0. Systematic analyses suggest that this superstructure in general appears just below a phase transition which could yield an anomalous kink in resistivity. We herein interpret this superstructure in terms of sodium ordering occurring at low temperatures. Measurements of magnetic susceptibility for all NaxCoO2 (0.75<x<1.0) materials show an antiferromagetic state with Neel temperature TN~4K.
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Taxonomy
TopicsMagnetic and transport properties of perovskites and related materials · Physics of Superconductivity and Magnetism · Advanced Condensed Matter Physics