Anomalous CDW ground state in Cu2Se: A wave-like fluctuation of the dc I-V curve near 50 K

Yao, Meng; Liu, Weishu; Chen, X.; Ren, Zhensong; Wilson, Stephen D.; Ren, Zhifeng; Opeil, Cyril

doi:10.1016/j.jmat.2016.12.003

Cited by 5 publications

(4 citation statements)

References 26 publications

(51 reference statements)

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“…This gives us a mean-field estimation of the CDW transition temperature (2 = 3.52 T CDW ) to be T CDW ≈ 9.15 K, consistent with the dc measurements. The corresponding coherence length can be estimated to be ξ 0 ≈ 2.4 nm, which is much smaller than the grain ∼1 μm, and similar to the observed value in other polycrystalline samples [31].…”

Section: Resultssupporting

confidence: 85%

Possible transition between charge density wave and Weyl semimetal phase in Y2Ir2O7

Juyal

Dwivedi²,

Verma³

et al. 2022

Phys. Rev. B

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The subtle interplay of band topology and symmetry broken phase, induced by electron correlations, has immense contemporary relevance and potentially offers novel physical insights. Here, we provide evidence of possible charge density wave (CDW) in bulk Y 2 Ir 2 O 7 for T < 10 K, and the Weyl semimetal (WSM) phase at higher temperatures. We observe the following characteristic properties of the CDW phase: (i) current induced nonlinear conductivity with negative differential resistance at low temperature, (ii) low-frequency Debye-like dielectric relaxation at low temperature with a large dielectric constant ∼10 8 , and (iii) an anomaly in the temperature dependence of the thermal expansion coefficient. The WSM phase at higher temperature is analyzed using the dc and ac transport measurements, which show an inductive response at low frequencies. More interestingly, we show that by reducing the crystallite size, the low-temperature CDW phase can be eliminated leading to the restoration of the WSM phase.

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Section: Resultssupporting

confidence: 85%

Possible transition between charge density wave and Weyl semimetal phase in Y2Ir2O7

Juyal

Dwivedi²,

Verma³

et al. 2022

Phys. Rev. B

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“…The increase of Hall carrier density is related with the CDW-like phase transition near 90 K in the electrical resistivity. In general, the CDW formation induces energy band gap opening leading to the decrease of Hall carrier concentration. − However, in this case, the Hall carrier densities are increased at the temperatures below the CDW-like phase transition. The broad shoulder in electrical resistivity on the InTe 1−δ compounds is more closely related with the decrease of Hall mobility in the vicinity of the CDW-like phase transition.…”

Section: Resultsmentioning

confidence: 99%

Temperature-Induced Lifshitz Transition and Charge Density Wave in InTe_1−δ Thermoelectric Materials

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Kim

Hyunyong

et al. 2020

ACS Appl. Energy Mater.

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We investigated the thermoelectric transport properties of InTe 1−δ (δ = 0.0, 0.1, and 0.2) compounds and interpreted their unusual behavior in terms of electronic and phonon band dispersions. The temperature-dependent electrical resistivity ρ(T) and Seebeck coefficient S(T) exhibit the charge density wave (CDW) transition near 87 K for InTe 1−δ (δ = 0.1 and 0.2) compounds. The CDW transitions on the Tedeficient compounds can be supported by the Fermi surface nesting along the M−X line in InTe 1−δ (δ = 0.25). The temperature-dependent Hall carrier density n H shows unusual behavior in that the n H (T) is increased by the Fermi surface reconstruction. From the temperature-dependent X-ray diffraction measurements, we found the superstructural lattice distortion at low temperatures (T ≤ 175 K), implying the intrinsic lattice instability. During the structural phase transition from tetragonal (I4/mcm) or orthorhombic (Ibam) to superstructural orthorhombic (Pbca) in InTe and Te-deficient InTe 0.8 , we observed a negative thermal expansion coefficient, giving rise to the large variation of negative Gruneisen parameters. Owing to the significant change in thermal expansion coefficients and Gruneisen parameters with respect to temperature, the energy band structure, in other words, Fermi surface, depends on the temperature, indicating a temperature-driven Lifshitz transition in InTe 1−δ compounds. The Te-deficiency induces significant anharmonicity of phonons from the numerous flat bands and negative phonon branches. The coexistences of temperature-driven Lifshitz transition, CDW formation, and lattice anharmonicity with high negative Gruneisen parameter in InTe 1−δ are very exceptional cases and suggest the profound physical properties in the compounds.

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“…The voltage changes linearly with the increase of current at different temperatures, which indicates SnS 2 is a pure metal state under 39.2 GPa. No saturation voltage or regular fluctuation related to charge density waves was found in the differential resistance, d V /d I . , …”

mentioning

confidence: 85%

“…No saturation voltage or regular fluctuation related to charge density waves was found in the differential resistance, dV/dI. 37,38 Pressure-induced metallization or superconductivity is usually accompanied by a collapse or transformation of the crystal structure, and previous Raman and XRD studies have reported that SnS 2 is stable up to 20 GPa. 39−41 High-pressure synchrotron XRD measurements were performed up to 62.7 GPa to verify the structural stability of SnS 2 under higher pressures.…”

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confidence: 99%

Superconductivity Induced by Lifshitz Transition in Pristine SnS₂ under High Pressure

Feng

Liu

Deng

et al. 2022

J. Phys. Chem. Lett.

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The importance of electronic structure evolutions and reconstitutions is widely acknowledged for strongly correlated systems. The precise effect of pressurized Fermi surface topology on metallization and superconductivity is a much-debated topic. In this work, an evolution from insulating to metallic behavior, followed by a superconducting transition, is systematically investigated in SnS2 under high pressure. In-situ X-ray diffraction measurements show the stability of the trigonal structure under compression. Interestingly, a Lifshitz transition, which has an important bearing on the metallization and superconductivity, is identified by the first-principles calculations between 35 and 40 GPa. Our findings provide a unique playground for exploring the relationship of electronic structure, metallization, and superconductivity under high pressure without crystal structural collapse.

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Anomalous CDW ground state in Cu2Se: A wave-like fluctuation of the dc I-V curve near 50 K

Cited by 5 publications

References 26 publications

Possible transition between charge density wave and Weyl semimetal phase in Y2Ir2O7

Possible transition between charge density wave and Weyl semimetal phase in Y2Ir2O7

Temperature-Induced Lifshitz Transition and Charge Density Wave in InTe_1−δ Thermoelectric Materials

Superconductivity Induced by Lifshitz Transition in Pristine SnS₂ under High Pressure

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Anomalous CDW ground state in Cu2Se: A wave-like fluctuation of the dc I-V curve near 50 K

Cited by 5 publications

References 26 publications

Possible transition between charge density wave and Weyl semimetal phase in Y2Ir2O7

Possible transition between charge density wave and Weyl semimetal phase in Y2Ir2O7

Temperature-Induced Lifshitz Transition and Charge Density Wave in InTe1−δ Thermoelectric Materials

Superconductivity Induced by Lifshitz Transition in Pristine SnS2 under High Pressure

Contact Info

Product

Resources

About

Temperature-Induced Lifshitz Transition and Charge Density Wave in InTe_1−δ Thermoelectric Materials

Superconductivity Induced by Lifshitz Transition in Pristine SnS₂ under High Pressure