通过氮含量调控ZrN薄膜中的超导圆顶  

Emergence of superconducting dome in ZrNx films via variation ofnitrogen concentration

作　　者：陈赋聪 柏欣博 王郁欣 董涛 时金安 张衍敏 孙晓敏 魏忠旭 秦明阳 袁洁 陈其宏 汪信波 王旭 朱北沂 黄荣进 蒋坤 周武 王楠林 胡江平 李洋沐 金魁 赵忠贤 Fucong Chen;Xinbo Bai;Yuxin Wang;Tao Dong;Jinan Shi;Yanmin Zhang;Xiaomin Sun;Zhongxu Wei;Mingyang Qin;Jie Yuan;Qihong Chen;Xinbo Wang;Xu Wang;Beiyi Zhu;Rongjin Huang;Kun Jiang;Wu Zhou;Nanlin Wang;Jiangping Hu;Yangmu Li;Kui Jin;Zhongxian Zhao(Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;International Center for Quantum Materials,School of Physics,Peking University,Beijing 100871,China;CAS Key Laboratory of Cryogenics,Technical Institute of Physics and Chemistry,Beijing 100190,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [3]International Center for Quantum Materials,School of Physics,Peking University,Beijing 100871,China [4]CAS Key Laboratory of Cryogenics,Technical Institute of Physics and Chemistry,Beijing 100190,China [5]Songshan Lake Materials Laboratory,Dongguan 523808,China

出　　处：《Science Bulletin》2023年第7期674-678,共5页科学通报（英文版）

基　　金：This work was supported by the National Key Basic Research Program of China(2021YFA0718700,2017YFA0302900,2017YFA0303003,2018YFB0704102,and 2018YFA0305800);the National Natural Science Foundation of China(11888101,11927808,11834016,11961141008,12174428,and 12274439);the Strategic Priority Research Program(B)of Chinese Academy of Sciences(XDB25000000,XDB33000000);CAS Interdisciplinary Innovation Team,Beijing Natural Science Foundation(Z190008);CAS through the Youth Innovation Promotion Association(2022YSBR-048);Key-Area Research and Development Program of Guangdong Province(2020B0101340002);the Center for Materials Genome.

摘　　要：超导圆顶作为非常规超导材料的一个常见特征,其存在经常被用来作为区分常规与非常规超导材料的判别标准.本文利用脉冲激光沉积氮化锆薄膜,并通过改变薄膜中的氮含量,实现了超导圆顶于绝缘态附近的调控。利用电学输运、磁性表征、太赫兹光谱、拉曼散射和透射电镜综合实验手段与密度泛函计算,作者发现氮化锆薄膜正常态存在从强绝缘到金属态再到弱绝缘的转变,其电阻率表现出类似于非常规超导的线性温度依赖到二次温度依赖特征.而氮化锆超导能隙及其转变温度符合BCS预期,其超导圆顶的演化与材料中电声耦合强度及结构无序相关,这项工作为“常规”超导材料中存在的“非常规”超导圆顶提供了强有力的证据与实例.Most superconductors can be categorized into two classes–the conventional Bardeen-Cooper-Schrieffer(BCS)superconductors[1]and the unconventional superconductors including the strongly correlated high-T_(c)superconductors[2].

关 键 词：转变温度 温度依赖 太赫兹光谱 密度泛函计算 结构无序 ZrN薄膜 超导能隙 拉曼散射 

分 类 号：TB34[一般工业技术—材料科学与工程]