{"title":"Superconducting states in La3Ni2O7 with a parallel magnetic field","authors":"Tianyang Xie, Wei Zhu","doi":"10.1007/s11433-024-2632-5","DOIUrl":null,"url":null,"abstract":"<div><p>Since the discovery of a superconducting state in La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub> with <i>T</i><sub><i>c</i></sub> = 80 K under high pressure, numerous experimental and theoretical studies have been initiated on this material. In this paper, we study the candidate superconducting states in this system, i.e., interlayer <i>s</i>-wave pairing and intralayer <i>d</i>-wave pairing, in response to the parallel magnetic field. We find that the interlayer <i>s</i>-wave state effectively screens the parallel magnetic field, thereby forming a Fulde-Ferrell (FF) state. Conversely, the intralayer <i>d</i>-wave state cannot efficiently screen the magnetic field, leading to minor perturbations in the spatial distribution of the order parameters. We propose a method utilizing Josephson junctions to distinguish these two distinct superconducting states. Our findings are anticipated to enrich the understanding of superconducting phases.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 6","pages":""},"PeriodicalIF":7.5000,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Science China Physics, Mechanics & Astronomy","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1007/s11433-024-2632-5","RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Since the discovery of a superconducting state in La3Ni2O7 with Tc = 80 K under high pressure, numerous experimental and theoretical studies have been initiated on this material. In this paper, we study the candidate superconducting states in this system, i.e., interlayer s-wave pairing and intralayer d-wave pairing, in response to the parallel magnetic field. We find that the interlayer s-wave state effectively screens the parallel magnetic field, thereby forming a Fulde-Ferrell (FF) state. Conversely, the intralayer d-wave state cannot efficiently screen the magnetic field, leading to minor perturbations in the spatial distribution of the order parameters. We propose a method utilizing Josephson junctions to distinguish these two distinct superconducting states. Our findings are anticipated to enrich the understanding of superconducting phases.
自从在 La3Ni2O7 中发现高压下 Tc = 80 K 的超导态以来，人们开始对这种材料进行大量的实验和理论研究。本文研究了该体系中的候选超导态，即层间 s 波配对和层内 d 波配对对平行磁场的响应。我们发现，层间 s 波态能有效屏蔽平行磁场，从而形成富德-费雷尔（FF）态。相反，层内 d 波态无法有效屏蔽磁场，从而导致阶次参数的空间分布出现微小扰动。我们提出了一种利用约瑟夫森结来区分这两种不同超导态的方法。我们的发现有望丰富人们对超导态的理解。
期刊介绍：
Science China Physics, Mechanics & Astronomy, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research.
Science China Physics, Mechanics & Astronomy, is published in both print and electronic forms. It is indexed by Science Citation Index.
Categories of articles:
Reviews summarize representative results and achievements in a particular topic or an area, comment on the current state of research, and advise on the research directions. The author’s own opinion and related discussion is requested.
Research papers report on important original results in all areas of physics, mechanics and astronomy.
Brief reports present short reports in a timely manner of the latest important results.
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