Hidden competing phase revealed by first-principles calculations of phonon instability in the nearly optimally doped cuprate La1.875Sr0.125CuO4
學年 110
學期 1
出版（發表）日期 2021-08-30
作品名稱 Hidden competing phase revealed by first-principles calculations of phonon instability in the nearly optimally doped cuprate La1.875Sr0.125CuO4
作品名稱（其他語言）
著者 Chi-Cheng Lee; Ji-Yao Chiu; Yukiko Yamada-Takamura; Taisuke Ozaki
單位
出版者
著錄名稱、卷期、頁數 PHYSICAL REVIEW B 104(6), 064114
摘要 The representative cuprate La2−xMxCuO4 with M=Sr and x=1/8 is studied via first-principles calculations in the high-temperature tetragonal (HTT), low-temperature orthorhombic (LTO), and low-temperature less-orthorhombic (LTLO) structures. By suppressing the magnetism and superconductivity, the LTLO phase, which has rarely been observed in La2−xSrxCuO4, is found to be the ground state where the structural phase transitions HTT→LTO→LTLO can be understood via phonon instability. Although the La-O composition is identified to be responsible for the phonon softening, the superconducting CuO2 layer is dynamically stable. The LTLO phase, which can exhibit an ∼20−meV splitting in the density of states, is proposed to have an intimate relationship with the observed pseudogap and the charge-density wave giving the stripe. We argue that at low temperatures, the superconducting LTO La1.875Sr0.125CuO4 competes with the phonon-preferred LTLO phase by spontaneously forming the Cooper pairs, resulting in suppressing the stripe. Therefore, the revealed LTLO phase is indispensable for understanding La2−xSrxCuO4.
關鍵字
語言 en_US
ISSN 2469-9969
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 是
國別 USA
公開徵稿
出版型式 ,電子版
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