{"title":"First-order transition in LK-99 containing Cu2S","authors":"Shilin Zhu , Wei Wu , Zheng Li , Jianlin Luo","doi":"10.1016/j.matt.2023.11.001","DOIUrl":null,"url":null,"abstract":"<div><p>Lee et al. report that the compound LK-99, with a chemical formula of Pb<sub>10-x</sub>Cu<sub>x</sub>(PO<sub>4</sub>)<sub>6</sub><span><span>O (0.9 < x < 1.1), exhibits room temperature superconductivity under ambient pressure. In this study, we investigated the transport and </span>magnetic properties of pure Cu</span><sub>2</sub>S and LK-99 containing Cu<sub>2</sub><span>S. We observed a sharp superconducting-like transition and a thermal hysteresis behavior in the resistivity and magnetic susceptibility. However, we did not observe zero resistivity below the transition temperature. We argue that the so-called superconducting behavior in LK-99 is most likely due to a reduction in resistivity caused by the first-order structural phase transition of Cu</span><sub>2</sub>S at around 385 K, from the hexagonal structure phase at high temperature to the monoclinic structure phase at low temperature.</p></div>","PeriodicalId":388,"journal":{"name":"Matter","volume":null,"pages":null},"PeriodicalIF":17.3000,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Matter","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2590238523005647","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 1
Abstract
Lee et al. report that the compound LK-99, with a chemical formula of Pb10-xCux(PO4)6O (0.9 < x < 1.1), exhibits room temperature superconductivity under ambient pressure. In this study, we investigated the transport and magnetic properties of pure Cu2S and LK-99 containing Cu2S. We observed a sharp superconducting-like transition and a thermal hysteresis behavior in the resistivity and magnetic susceptibility. However, we did not observe zero resistivity below the transition temperature. We argue that the so-called superconducting behavior in LK-99 is most likely due to a reduction in resistivity caused by the first-order structural phase transition of Cu2S at around 385 K, from the hexagonal structure phase at high temperature to the monoclinic structure phase at low temperature.
期刊介绍：
Matter, a monthly journal affiliated with Cell, spans the broad field of materials science from nano to macro levels,covering fundamentals to applications. Embracing groundbreaking technologies,it includes full-length research articles,reviews, perspectives,previews, opinions, personnel stories, and general editorial content.
Matter aims to be the primary resource for researchers in academia and industry, inspiring the next generation of materials scientists.
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