Quantum criticality tuned by magnetic field in optimally electron-doped cuprate thin films
Xu Zhang, Heshan Yu, Qihong Chen, Runqiu Yang, Ge He, Ziquan Lin, Qian Li, Jie Yuan, Beiyi Zhu, Liang Li, Yi-feng Yang, Tao Xiang, Rong-Gen Cai, Anna Kusmartseva, F. V. Kusmartsev, Jun-Feng Wang, Kui Jin
DOI 10.1103/PhysRevB.103.014517 · Physical Review B
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Abstract
Antiferromagnetic (AF) spin fluctuations are commonly believed to play a key role in electron pairing of cuprate superconductors. In electron-doped cuprates, a paradox still exists about the interplay among different electronic states in quantum perturbations, especially between superconducting and magnetic states. Here, we report a systematic transport study of cation-optimized La2−xCexCuO4±δ (x=0.10) thin films in high magnetic fields. We find an AF quantum phase transition near 60 T, where the Hall number jumps from nH=−x to nH=1−x, resembling the change in nH at the AF boundary (xAF=0.14) tuned by Ce doping. In the AF region a spin-dependent state manifesting anomalous positive magnetoresistance is observed, which is closely related to superconductivity. Once the AF state is suppressed by magnetic field, a polarized ferromagnetic state is predicted, reminiscent of the recently reported ferromagnetic state at the quantum end point of the superconducting dome by Ce doping. The magnetic field that drives phase transitions in a manner similar to but distinct from doping thereby provides a unique perspective to understand the quantum criticality of electron-doped cuprates.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xCexCuO4±δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25.6 | Pressure not reported | zero_resistance |
| La2-xCexCuO4±δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25.3 | Pressure not reported | zero_resistance |
| La2-xCexCuO4±δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24.1 | Pressure not reported | zero_resistance |
| La2-xCexCuO4±δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23.1 | Pressure not reported | zero_resistance |
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