Multiple magnetic-phase transitions and critical behavior of charge-density wave compound TbTe₃

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Yang, Zhengqiang ; Drew, Alan J. ; van Smaalen, Sander ; van Well, Natalija ; Pratt, Francis L. ; Stenning, Gavin B. G. ; Karim, Abid ; Rabia, Kaneez:
Multiple magnetic-phase transitions and critical behavior of charge-density wave compound TbTe₃.
In: Journal of Physics: Condensed Matter. Bd. 32 (2020) Heft 30 . - 305801.
ISSN 1361-648X
DOI: https://doi.org/10.1088/1361-648x/ab8425

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Abstract

We report multiple magnetic phase transitions and critical behavior of the 2D charge-density wave compound TbTe3 studied by μSR measurements and dc magnetization measurements. Zero-field μSR has shown three magnetic transitions below 7 K. The longitudinal field measurements under 50 G has confirmed the first transition at T N = 6.3 K. Scaling analysis from above T N gives the critical exponent w = 0.63(5), suggesting the Ising 3D antiferromagnetic nature of the ordering, which is likely mediated by the 2D correlations. However, the obtained w = 0.81(5) below T N indicates the ferromagnetic phase, which arises over the multiphase transitions at lower temperatures. Temperature-dependent transverse frequency shift gives a relatively smaller exponent γ = 1.0(1) than the Ising 3D model. The different transitions were also observed by dc magnetization measurements, suggesting two magnetic transitions at 7.4 K and 3.1 K, which correspond to the antiferromagnetic and ferromagnetic phases respectively.