Pressure-induced superconductivity in the quasi-one-dimensional charge density wave material CuTe
Shuyang Wang (王舒阳), Xuliang Chen (陈绪亮), Chao An, Ying Zhou, Yonghui Zhou, Chuanchuan Gu, Lili Zhang, Xiaoping Yang, Zhaorong Yang (杨昭荣)
DOI 10.1103/PhysRevB.103.134518 · Physical Review B
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Abstract
Copper monotelluride CuTe has a layered orthorhombic structure (space group Pmmn, No. 59) but exhibits a quasi-one-dimensional charge density wave (CDW) order. Here, we present a high-pressure study of CuTe in a diamond anvil cell at pressures up to 41.8–49.8 GPa, through a combination of electrical transport, synchrotron x-ray diffraction (XRD), and Raman spectroscopy measurements as well as theoretical calculations. Our transport experiments show that the CDW transition is manifested as a hump in resistivity; with the application of external pressure, its transition temperature TCDW decreases gradually and the amplitude of the resistivity hump decays rapidly. The CDW gets suppressed completely above ∼10 GPa as estimated by a linear extrapolation of the TCDW versus P trend. Upon further compression, a sudden drop in resistivity is initially observed at ∼2.4 K and ∼20 GPa, and zero resistance is established above ∼37 GPa, suggesting the occurrence of superconductivity (SC). Combined XRD and Raman data as well as theoretical calculations together evidence that the emergence of SC at ∼20 GPa is accompanied by an orthorhombic to monoclinic (space group Cm, No. 8) structural transition.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CuTe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.4 | 20.7 GPa | onset |
| CuTe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.4 | 37 GPa | zero_resistance |
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