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arXiv 2007.12765cond-mat.str-elcond-mat.supr-con
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电子掺杂铜氧化物反铁磁区的奇异输运

Strange Metallic Transport in the Antiferromagnetic Regime of Electron Doped Cuprates

Tarapada Sarkar, Nicholas R Poniatowski, Joshua S. Higgins, P. R. Mandal, Mun K Chan, Richard L Greene

摘要:

本文报道了高温超导体La $_{2-x}$ Ce $_x$ CuO $_4$(LCCO)的电子掺杂薄膜在0.7 ~ 45 K温度和65 T磁场下的磁电阻和霍尔效应。当x = 0.12和0.13时,在费米面重构(FSR)的正下方,正常态面内电阻率在低温下呈现出众所周知的上升。我们的新结果表明,这种电阻率上升在高磁场下被消除,并且电阻率从$\sim$ 40 K下降到0.7 K成为温度线性。线性系数的大小与Tc和掺杂成比例,如先前对于FSR以上的掺杂所发现的[1,2]。此外,正常状态的霍尔系数具有非常规的场依赖性的温度低于50 K。这种反常的输运数据对理论提出了新的挑战,并表明反铁磁区也存在奇怪的金属正常态。

英文摘要:

We report magnetoresistance and Hall Effect results for electron-doped films of the high-temperature superconductor La$_{2-x}$Ce$_x$CuO$_4$ (LCCO) for temperatures from 0.7 to 45 K and magnetic fields up to 65 T. For x = 0.12 and 0.13, just below the Fermi surface reconstruction (FSR), the normal state in-plane resistivity exhibits a well-known upturn at low temperature. Our new results show that this resistivity upturn is eliminated at high magnetic field and the resistivity becomes linear-in-temperature from $\sim$ 40 K down to 0.7 K. The magnitude of the linear coefficient scales with Tc and doping, as found previously [1,2] for dopings above the FSR. In addition, the normal state Hall coefficient has an unconventional field dependence for temperatures below 50K. This anomalous transport data presents a new challenge to theory and suggests that the strange metal normal state is also present in the antiferromagnetic regime.

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