Magnetotransport in Fe-intercalated TS2 : Comparison between T = Ti and Ta

Article

关键词: AC MAGNETIC-SUSCEPTIBILITY;    SPIN-GLASS PHASE;    TANTALUM DICHALCOGENIDES;    CLUSTER-GLASS;    TRANSPORT;    FEXTIS2;    SUPERCONDUCTIVITY;    NIOBIUM;   

DOI  :  10.1103/PhysRevB.99.064420

来源: SCIE

【 摘 要 】

Sharp magnetization switching and large magnetoresistance (MR) were previously discovered in single crystals of 2H-FexTaS2 and attributed to the Fe superstructure and its defects. We report similar sharp switching and large MR in 1T-FexTiS2 (0.086 <= x <= .0.703) while providing a side-by-side comparison of the only two such ferromagnetic transition-metal dichalcogenides. The switching field H-s, and MR values are similar in both 1T-FexTiS2 and 2H-FexTaS2, with a larger than expected bowtie rho(H) and a sharper hysteresis loop for H parallel to c in the former. The Curie and Weiss temperatures remain roughly constant below x similar to 1/3 in the T = Ti single crystals before increasing monotonically for higher x, while H-s and MR reach maxima where defects in the superstructure exist, or a minimum near superstructure compositions, and they remain constant above x similar to 0.4. Despite previous reports, electron diffraction shows only the root 3 x root 3 superstructure in 1T-FexTiS2. Glassy behavior is shown to coexist within the ferromagnetic state in 1T-FexTiS2 for compositions between 0.1 and 0.703. A simple theoretical model considering first-, second- and third-neighbor interactions yields a phase diagram that accounts for both spin glass behavior and different superstructures.

【 授权许可】

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