Microscopic evidence for the intra-unit-cell electronic nematicity inside the pseudogap phase in YBa_(2)Cu_(4)O_(8)

作     者：Wen Wang Jun Luo ChunGuang Wang Jie Yang Yasuharu Kodama Rui Zhou Guo-Qing Zheng Wen Wang;Jun Luo;ChunGuang Wang;Jie Yang;Yasuharu Kodama;Rui Zhou;Guo-Qing Zheng

作者机构：Institute of PhysicsChinese Academy of SciencesBeijing National Laboratory for Condensed Matter PhysicsBeijing 100190China School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing 100190China National Institute of Advanced Industrial Science and Technology(AlST)Tsukuba 305-8568Japan Songs han Lake Materials LaboratoryDongguan 523808China Department of PhysicsOkayama UniversityOkayama 700-8530Japan 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2021年第64卷第3期

页      面：99-104页

核心收录：

学科分类：080705[工学-制冷及低温工程] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 11974405, 11674377, and 11634015) the Ministry of Science and Technology of China (Grant Nos. 2016YFA0300502, and 2017YFA0302904) the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB33010100) 

主　　题：high-temperature superconductors nuclear magnetic resonance nematic order pseudogap 

摘      要：Understanding the nature of the mysterious pseudogap phenomenon is one of the most important issues associated with cuprate high-T_(c) ***,we report 17O nuclear magnetic resonance(NMR) studies on two planar oxygen sites in stoichio?metric cuprate YBa_(2)Cu_(4)O_(8) to investigate the symmetry breaking inside the pseudogap *** observe that the Knight shifts of the two oxygen sites are identical at high temperatures but different below T_(nem) ~185 K,which is close to the pseudogap temperature T^(*).Our result provides a microscopic evidence for intra-unit-cell electronic *** difference in quadrupole resonance frequency between the two oxygen sites is unchanged below T_(nem),which suggests that the observed nematicity does not directly stem from the local charge density ***,a short-range charge density wave(CDW) order is observed below T=150 *** additional broadening in the 17O-NMR spectra because of this CDW order is determined to be inequivalent for the two oxygen sites,which is similar to that observed in case of *** results suggest a possible connection between nematicity,CDW order,and pseudogap.