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Quasiparticle spectroscopy and high-field phase diagrams of cuprate superconductors -- An investigation of competing orders and quantum criticality

N. -C. Yeh·C. -T. Chen·V. S. Zapf·A. D. Beyer·C. R. Hughes·M. -S. Park·K. -H. Kim·S. -I. Lee
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Abstract

We present scanning tunneling spectroscopic and high-field thermodynamic studies of hole- and electron-doped (p- and n-type) cuprate superconductors. Our experimental results are consistent with the notion that the ground state of cuprates is in proximity to a quantum critical point (QCP) that separates a pure superconducting (SC) phase from a phase comprised of coexisting SC and a competing order, and the competing order is likely a spin-density wave (SDW). The effect of applied magnetic field, tunneling current, and disorder on the revelation of competing orders and on the low-energy excitations of the cuprates is discussed.

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N. -C. Yeh, C. -T. Chen, V. S. Zapf, A. D. Beyer, C. R. Hughes, M. -S. Park, K. -H. Kim, S. -I. Lee. 2004-08-04. Quasiparticle spectroscopy and high-field phase diagrams of cuprate superconductors -- An investigation of competing orders and quantum criticality. https://doi.org/10.1142/s0217979205028426

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