Physcial Properties of SuperconductorNo Access

QUASIPARTICLE SPECTROSCOPY AND HIGH-FIELD PHASE DIAGRAMS OF CUPRATE SUPERCONDUCTORS – AN INVESTIGATION OF COMPETING ORDERS AND QUANTUM CRITICALITY

N.-C. YEH

Department of Physics, California Institute of Technology, Pasadena, CA 91125, USA

Corresponding author.

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C.-T. CHEN

Department of Physics, California Institute of Technology, Pasadena, CA 91125, USA

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V. S. ZAPF

Department of Physics, California Institute of Technology, Pasadena, CA 91125, USA

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A. D. BEYER

Department of Physics, California Institute of Technology, Pasadena, CA 91125, USA

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C. R. HUGHES

Department of Physics, California Institute of Technology, Pasadena, CA 91125, USA

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M.-S. PARK

Pohang University of Science and Technology, Pohang 790-784, Republic of Korea

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K.-H. KIM

Pohang University of Science and Technology, Pohang 790-784, Republic of Korea

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, and

S.-I. LEE

Pohang University of Science and Technology, Pohang 790-784, Republic of Korea

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https://doi.org/10.1142/S0217979205028426Cited by:8 (Source: Crossref)

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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