| 標題：Hidden competing phase revealed by first-principles calculations of phonon instability in the nearly optimally doped cuprate La1.875Sr0.125CuO4 |
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| 學年 | 110 |
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| 學期 | 1 |
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| 出版（發表）日期 | 2021/08/30 |
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| 作品名稱 | Hidden competing phase revealed by first-principles calculations of phonon instability in the nearly optimally doped cuprate La1.875Sr0.125CuO4 |
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| 作品名稱（其他語言） | |
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| 著者 | Chi-Cheng Lee; Ji-Yao Chiu; Yukiko Yamada-Takamura; Taisuke Ozaki |
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| 單位 | |
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| 出版者 | |
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| 著錄名稱、卷期、頁數 | Phys. Rev. B 104(6), 064114 |
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| 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. |
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| 關鍵字 | |
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| 語言 | 英文(美國) |
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| ISSN | 2469-9969 |
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| 期刊性質 | 國外 |
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| 收錄於 | SCI; |
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| 產學合作 | |
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| 通訊作者 | |
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| 審稿制度 | 是 |
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| 國別 | 美國 |
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| 公開徵稿 | |
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| 出版型式 | ,電子版 |
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| 相關連結 | |
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| SDGs | |
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