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

doi:10.1103/PhysRevB.103.104111

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

Research output: Contribution to journal › Article › peer-review

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Abstract

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 language	English
Article number	104111
Journal	Physical Review B
Volume	103
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.103.104111
State	Published - 29 Mar 2021

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Wu, H. C., Chung, Y. C., Yen, T. W., Chen, H. J., Kuo, T. W., Kakarla, D. C., Huang, S. M., Wang, Y. Y., Lin, J. Y., Lee, J. J., Lai, Y. C., Chen, C. L., Lee, J. F., Chou, T. L., Lai, Y. C., Chu, M. W., Chou, M. M. C., & Yang, H. D. (2021). Evidence of a structural phase transition in the triangular-lattice compound CuIr2Te4. Physical Review B, 103(10), Article 104111. https://doi.org/10.1103/PhysRevB.103.104111

@article{6bb4d64172484d6a94e4f319fc1042e1,

title = "Evidence of a structural phase transition in the triangular-lattice compound CuIr2Te4",

abstract = "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.",

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

note = "Publisher Copyright: {\textcopyright} 2021 American Physical Society. ",

year = "2021",

month = mar,

day = "29",

doi = "10.1103/PhysRevB.103.104111",

language = "English",

volume = "103",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Physical Society",

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TY - JOUR

T1 - Evidence of a structural phase transition in the triangular-lattice compound CuIr2Te4

AU - Wu, H. C.

AU - Chung, Y. C.

AU - Yen, T. W.

AU - Chen, H. J.

AU - Kuo, T. W.

AU - Kakarla, D. Chandrasekhar

AU - Huang, S. M.

AU - Wang, Y. Y.

AU - Lin, J. Y.

AU - Lee, J. J.

AU - Lai, Y. C.

AU - Chen, C. L.

AU - Lee, J. F.

AU - Chou, T. L.

AU - Lai, Y. C.

AU - Chu, M. W.

AU - Chou, Mitch M.C.

AU - Yang, H. D.

PY - 2021/3/29

Y1 - 2021/3/29

N2 - 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.

AB - 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.

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U2 - 10.1103/PhysRevB.103.104111

DO - 10.1103/PhysRevB.103.104111

M3 - Article

AN - SCOPUS:85103849248

SN - 2469-9950

VL - 103

JO - Physical Review B

JF - Physical Review B

IS - 10

M1 - 104111

ER -

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

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