Paredes Aulestia Esteban I, Liu Xinyou, Pang Yiu Yung, So Chun Wa, Yu Wing Chi, Goh Swee K, Lai Kwing To
Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong Special Administrative Region of China.
Department of Physics, City University of Hong Kong, Kowloon, Hong Kong Special Administrative Region of China.
J Phys Condens Matter. 2021 Nov 15;34(6). doi: 10.1088/1361-648X/ac34af.
Charge density wave (CDW) instability is often found in phase diagrams of superconductors such as cuprates and certain transition-metal dichalcogenides. This proximity to superconductivity triggers the question on whether CDW instability is responsible for the pairing of electrons in these superconductors. However, this issue remains unclear and new systems are desired to provide a better picture. Here, we report the temperature-pressure phase diagram of a recently discovered BiSsuperconductor LaOBiAgS, which shows a possible CDW transition at* ∼ 155 K and a superconducting transition at∼ 1.0 K at ambient pressure, via electrical resistivity measurements. Upon applying pressure,* decreases linearly and extrapolates to 0 K at 3.9 GPa. Meanwhile,is enhanced and reaches maximum value of 4.1 K at 3.1 GPa, forming a superconducting dome in the temperature-pressure phase diagram.
电荷密度波（CDW）不稳定性常见于铜酸盐和某些过渡金属二硫属化物等超导体的相图中。这种与超导性的接近引发了一个问题，即CDW不稳定性是否是这些超导体中电子配对的原因。然而，这个问题仍不明确，需要新的体系来提供更清晰的图景。在此，我们通过电阻率测量报告了最近发现的BiS超导体LaOBiAgS的温度-压力相图，该相图显示在常压下约155 K处可能存在CDW转变，在约1.0 K处存在超导转变。施加压力后，在3.9 GPa时线性下降并外推至0 K。同时，在3.1 GPa时增强并达到4.1 K的最大值，在温度-压力相图中形成一个超导穹顶。
