Evidence of a structural phase transition in the triangular-lattice compound CuIr2Te4

H. C. Wu*, Y. C. Chung, T. W. Yen, H. J. Chen, T. W. Kuo, D. Chandrasekhar Kakarla, S. M. Huang, Y. Y. Wang, J. Y. Lin, J. J. Lee, Y. C. Lai, C. L. Chen, J. F. Lee, T. L. Chou, Y. C. Lai, M. W. Chu, Mitch M.C. Chou, H. D. Yang

*Corresponding author for this work

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Synthesized CuIr2(Te1-xSex)4 samples were comprehensively characterized using various techniques. At ambient pressure, CuIr2Te4 undergoes an anomalous phase transition at Ts∼250K with a large thermal hysteresis of ΔTs ∼40K and a superconducting transition at Tc∼3K during magnetization and electrical-resistivity measurements. We determined this transition to be a first-order structural phase transition from high-temperature hexagonal (P3¯m1) to low-temperature triclinic (P1¯) symmetry. Both external physical pressure and chemical doping largely enhance Ts and ΔTs and suppress Tc, thereby indicating a strong correlation between Ts and Tc. Critically, no superlattice is observed below Ts as per the electron-diffraction examinations. Thus, the anomalous phase transition at Ts, which exhibits a large thermal hysteresis in resistivity and magnetization measurements, is structural rather than a charge-density-wave formation.

Original languageEnglish
Article number104111
JournalPhysical Review B
Issue number10
StatePublished - 29 Mar 2021


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