Wenshan Hong

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Speed of electronic phase propagation in $\mathrm{Ba}\mathrm{Fe}{}_{2}\mathrm{As}{}_{2}$ revealed by dilatometry

Apr 26, 2024 | link.aps.org | Xin Qin |Xingyu Wang |Wenshan Hong

Thermal expansion offers deep insights into phase transitions in condensed-matter physics. Utilizing an advanced ac temperature dilatometer with picometer resolution, this study clearly resolves the antiferromagnetic and structural transition in BaFe2As2. The implementation of temperature oscillation reveals a hysteresis near the transition temperature, TN, with unprecedented resolution.
Multiband superconductivity and a deep gap minimum from the specific heat in ${\mathrm{KCa}}_{2}{({\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Ni}}_{x})}_{4}{\mathrm{As}}_{4}{\mathrm{F}}_{2}$ $(x=0, 0.05, 0.13)$

Jan 10, 2024 | link.aps.org | Yiwen Li |Wenshan Hong |Zhengyan Zhu |Yongze Ye

Specific heat can explore low-energy quasiparticle excitations of superconductors, so it is a powerful tool for bulk measurement on the superconducting gap structure and pairing symmetry. Here, we report an in-depth investigation on the specific heat of the multiband superconductors KCa2(Fe1−xNix)4As4F2 (x=0, 0.05, 0.13) single crystals and the overdoped nonsuperconducting one with x=0.17.

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