Pressure-induced evolution of superconductivity and structural stability in a bulk 4Hb -TaSeS heterostructure
Yehua Huang, Hang Li, Xin Yang, Wenju Zhou, Donghan Jia, Jiajia Feng, He Zhang, Guoliang Niu, Bingmin Yan, Fuyang Liu, Qingchao Zeng, Guangwei Che, Runze Jiang, Junwei Li, Luhong Wang, Haozhe Liu, Ricardo D. dos Reis, Renbiao Tao, Xiaohui Yu, Qingyang Hu, Bin Chen, Huiyang Gou
DOI 10.1103/PhysRevB.111.144103 · Physical Review B
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Abstract
Transition-metal dichalcogenides (TMDs) are characterized by their unique layered structures and diverse electronic properties. Recent studies have highlighted the distinctive superconducting and charge density wave (CDW) behaviors of 4Hb−TaS2 and 4Hb−TaSe2. To explore the intriguing characteristics of these structurally modulated compounds, we synthesized 4Hb−TaSeS, which alternates between 1H and 1T layers, and investigated its structural and superconducting properties. At ambient pressure, 4Hb−TaSeS displays superconductivity with a transition temperature (Tc) of approximately 3.8 K. Under increasing pressure, Tc decreases to a minimum of around 2.3 K at 37 GPa, followed by a gradual recovery that forms an unusual valley in the Tc-pressure curve. High-pressure synchrotron x-ray diffraction measurements show that 4Hb−TaSeS maintains its hexagonal symmetry up to 82 GPa without undergoing any structural transitions. Resistivity measurements also indicate a transition from non-Fermi liquid to Fermi liquid behavior induced by pressure. Further theoretical calculations shed light on the pressure-dependent superconducting mechanism, demonstrating that superconductivity is primarily influenced by Ta atoms, with contributions predominantly from H-layer Ta at lower pressures, gradually shifting to T-layer Ta as pressure increases. These findings offer valuable insights into pressure-induced superconductivity in TMDs and other complex layered systems.
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