TY - JOUR
T1 - Magnetotransport in Fe-intercalated T S2
T2 - Comparison between T=Ti and Ta
AU - Choe, Jesse
AU - Lee, Kyungmin
AU - Huang, C. L.
AU - Trivedi, Nandini
AU - Morosan, E.
N1 - Funding Information:
J.C. and E.M. acknowledge support from DMREF 1629374. C.L.H. is acknowledging partial support from the Gordon and Betty Moore EPiQS Grant No. GBMF 4417. K.L. and N.T. acknowledge support from the National Science Foundation Grant No. DMR-1629382.
Publisher Copyright:
© 2019 American Physical Society.
PY - 2019/2/19
Y1 - 2019/2/19
N2 - 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 Hs and MR values are similar in both 1T-FexTiS2 and 2H-FexTaS2, with a larger than expected bowtie ρ(H) and a sharper hysteresis loop for Hc in the former. The Curie and Weiss temperatures remain roughly constant below x∼1/3 in the T=Ti single crystals before increasing monotonically for higher x, while Hs and MR reach maxima where defects in the superstructure exist, or a minimum near superstructure compositions, and they remain constant above x∼0.4. Despite previous reports, electron diffraction shows only the 3×3 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.
AB - 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 Hs and MR values are similar in both 1T-FexTiS2 and 2H-FexTaS2, with a larger than expected bowtie ρ(H) and a sharper hysteresis loop for Hc in the former. The Curie and Weiss temperatures remain roughly constant below x∼1/3 in the T=Ti single crystals before increasing monotonically for higher x, while Hs and MR reach maxima where defects in the superstructure exist, or a minimum near superstructure compositions, and they remain constant above x∼0.4. Despite previous reports, electron diffraction shows only the 3×3 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.
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U2 - 10.1103/PhysRevB.99.064420
DO - 10.1103/PhysRevB.99.064420
M3 - Article
AN - SCOPUS:85061987652
VL - 99
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 6
M1 - 064420
ER -