skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: High-Energy Spin Excitations in the Electron-Doped Superconductor Pr{sub 0.88}LaCe{sub 0.12}CuO{sub 4-{delta}} with T{sub c}=21 K

Abstract

We use high-resolution inelastic neutron scattering to study the low-temperature magnetic excitations of the electron-doping superconductor Pr{sub 0.88}LaCe{sub 0.12}CuO{sub 4-{delta}} (T{sub c}=21{+-}1 K) over a wide energy range (4 meV{<=}({Dirac_h}/2{pi}){omega}{<=}330 meV). The effect of electron doping is to cause a wave vector (Q) broadening in the low-energy (({Dirac_h}/2{pi}){omega}{<=}80 meV) commensurate spin fluctuations at (0.5, 0.5) and to suppress the intensity of spin-wave-like excitations at high energies (({Dirac_h}/2{pi}){omega}{>=}100 meV). This leads to a substantial redistribution in the spectrum of the local dynamical spin susceptibility {chi}{sup ''}({omega}), and reveals a new energy scale similar to that of the lightly hole-doped YB{sub 2}Cu{sub 3}O{sub 6.353} (T{sub c}=18 K)

Authors:
; ;  [1];  [1];  [2];  [3];  [4]; ;  [5]
  1. Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200 (United States)
  2. (United States)
  3. Center for Neutron Scattering, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States)
  4. ISIS Facility, Rutherford Appleton Laboratory, Oxon OX11 0QX (United Kingdom)
  5. Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511 (Japan)
Publication Date:
OSTI Identifier:
20777157
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 96; Journal Issue: 15; Other Information: DOI: 10.1103/PhysRevLett.96.157001; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERIUM COMPOUNDS; CUPRATES; DOPED MATERIALS; ELECTRONS; EXCITATION; HIGH-TC SUPERCONDUCTORS; INELASTIC SCATTERING; LANTHANUM COMPOUNDS; MEV RANGE 10-100; MEV RANGE 100-1000; NEUTRON DIFFRACTION; PRASEODYMIUM COMPOUNDS; SPIN; SPIN WAVES; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0013-0065 K

Citation Formats

Wilson, Stephen D., Li Shiliang, Woo, Hyungje, Dai, Pengcheng, Center for Neutron Scattering, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, Mook, H.A., Frost, C.D., Komiya, Seiki, and Ando, Yoichi. High-Energy Spin Excitations in the Electron-Doped Superconductor Pr{sub 0.88}LaCe{sub 0.12}CuO{sub 4-{delta}} with T{sub c}=21 K. United States: N. p., 2006. Web. doi:10.1103/PhysRevLett.96.157001.
Wilson, Stephen D., Li Shiliang, Woo, Hyungje, Dai, Pengcheng, Center for Neutron Scattering, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, Mook, H.A., Frost, C.D., Komiya, Seiki, & Ando, Yoichi. High-Energy Spin Excitations in the Electron-Doped Superconductor Pr{sub 0.88}LaCe{sub 0.12}CuO{sub 4-{delta}} with T{sub c}=21 K. United States. doi:10.1103/PhysRevLett.96.157001.
Wilson, Stephen D., Li Shiliang, Woo, Hyungje, Dai, Pengcheng, Center for Neutron Scattering, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, Mook, H.A., Frost, C.D., Komiya, Seiki, and Ando, Yoichi. Fri . "High-Energy Spin Excitations in the Electron-Doped Superconductor Pr{sub 0.88}LaCe{sub 0.12}CuO{sub 4-{delta}} with T{sub c}=21 K". United States. doi:10.1103/PhysRevLett.96.157001.
@article{osti_20777157,
title = {High-Energy Spin Excitations in the Electron-Doped Superconductor Pr{sub 0.88}LaCe{sub 0.12}CuO{sub 4-{delta}} with T{sub c}=21 K},
author = {Wilson, Stephen D. and Li Shiliang and Woo, Hyungje and Dai, Pengcheng and Center for Neutron Scattering, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 and Mook, H.A. and Frost, C.D. and Komiya, Seiki and Ando, Yoichi},
abstractNote = {We use high-resolution inelastic neutron scattering to study the low-temperature magnetic excitations of the electron-doping superconductor Pr{sub 0.88}LaCe{sub 0.12}CuO{sub 4-{delta}} (T{sub c}=21{+-}1 K) over a wide energy range (4 meV{<=}({Dirac_h}/2{pi}){omega}{<=}330 meV). The effect of electron doping is to cause a wave vector (Q) broadening in the low-energy (({Dirac_h}/2{pi}){omega}{<=}80 meV) commensurate spin fluctuations at (0.5, 0.5) and to suppress the intensity of spin-wave-like excitations at high energies (({Dirac_h}/2{pi}){omega}{>=}100 meV). This leads to a substantial redistribution in the spectrum of the local dynamical spin susceptibility {chi}{sup ''}({omega}), and reveals a new energy scale similar to that of the lightly hole-doped YB{sub 2}Cu{sub 3}O{sub 6.353} (T{sub c}=18 K)},
doi = {10.1103/PhysRevLett.96.157001},
journal = {Physical Review Letters},
number = 15,
volume = 96,
place = {United States},
year = {Fri Apr 21 00:00:00 EDT 2006},
month = {Fri Apr 21 00:00:00 EDT 2006}
}
  • We use high-resolution inelastic neutron scattering to study the low-temperature magnetic excitations of the electron-doping superconductor Pr{sub 0.88}LaCe{sub 0.12}CuO{sub 4-{delta}} (T{sub c} = 21 {+-} 1 K) over a wide energy range (4 meV {le} {le} {omega} {le} 330 meV). The effect of electron doping is to cause a wave vector (Q) broadening in the low-energy ({omega} {le} 80 meV) commensurate spin fluctuations at (0.5, 0.5) and to suppress the intensity of spin-wave-like excitations at high energies ({omega} {ge} 100 meV). This leads to a substantial redistribution in the spectrum of the local dynamical spin susceptibility {chi}{sup -}({omega}), and revealsmore » a new energy scale similar to that of the lightly hole-doped YB{sub 2}Cu{sub 3}O{sub 6.353} (T{sub c} = 18 K).« less
  • We use inelastic neutron scattering to explore the evolution of the low energy spin dynamics in the electron-doped cuprate Pr{sub 0.88}LaCe{sub 0.12}CuO{sub 4-{delta}} (PLCCO) as the system is tuned from its nonsuperconducting, as-grown antiferromagnetic (AF) state into an optimally doped superconductor (T{sub c}{approx_equal}24 K) without static AF order. The low-temperature, low-energy response of the spin excitations in underdoped samples is coupled to the presence of the AF phase, whereas the low-energy magnetic response for samples near optimal T{sub c} exhibits spin fluctuations surprisingly insensitive to the sample temperature. This evolution of the low-energy excitations is consistent with the influence ofmore » a quantum critical point in the phase diagram of PLCCO associated with the suppression of the static AF order. We carried out scaling analysis of the data and discuss the influence of quantum critical dynamics in the observed excitation spectrum.« less
  • In conventional superconductors, the interaction that pairs the electrons to form the superconducting state is mediated by lattice vibrations (phonons). In high-transition-temperature (high-T{sub c}) copper oxides, it is generally believed that magnetic excitations might play a fundamental role in the superconducting mechanism because superconductivity occurs when mobile 'electrons' or 'holes' are doped into the antiferromagnetic parent compounds. Indeed, a sharp magnetic excitation termed 'resonance' has been observed by neutron scattering in a number of hole-doped materials. The resonance is intimately related to superconductivity, and its interaction with charged quasi-particles observed by photoemission, optical conductivity, and tunnelling suggests that it mightmore » play a part similar to that of phonons in conventional superconductors. The relevance of the resonance to high-T{sub c} superconductivity, however, has been in doubt because so far it has been found only in hole-doped materials. Here we report the discovery of the resonance in electron-doped superconducting Pr{sub 0.88}LaCe{sub 0.12}CuO{sub 4-{delta}} (T{sub c} = 24 K). We find that the resonance energy (E{sub r}) is proportional to T{sub c} via E{sub r} {approx} 5.8k{sub B}T{sub c} for all high-T{sub c} superconductors irrespective of electron- or hole-doping. Our results demonstrate that the resonance is a fundamental property of the superconducting copper oxides and therefore must be essential in the mechanism of superconductivity.« less
  • We use inelmore » astic neutron scattering to explore the evolution of the low energy spin dynamics in the electron-doped cuprate Pr 0.88 LaCe 0.12 CuO 4 - δ (PLCCO) as the system is tuned from its nonsuperconducting, as-grown antiferromagnetic (AF) state into an optimally doped superconductor (T c ≈ 24K) without static AF order. The low-temperature, low-energy response of the spin excitations in underdoped samples is coupled to the presence of the AF phase, whereas the low-energy magnetic response for samples near optimal T c exhibits spin fluctuations surprisingly insensitive to the sample temperature. This evolution of the low-energy excitations is consistent with the influence of a quantum critical point in the phase diagram of PLCCO associated with the suppression of the static AF order. Finally, we carried out scaling analysis of the data and discuss the influence of quantum critical dynamics in the observed excitation spectrum.« less
  • We use neutron scattering to demonstrate that electron-doped superconducting Pr{sub 0.88}LaCe{sub 0.12}CuO{sub 4-{delta}} in the underdoped regime is electronically phase separated in the ground state, showing the coexistence of a superconducting phase with a three-dimensional antiferromagnetically ordered phase and a quasi-two-dimensional spin-density wave modulation. The Neel temperature of both antiferromagnetic phases decreases linearly with increasing superconducting transition temperature (T{sub c}) and vanishes when optimal superconductivity is achieved. These results indicate that the electron-doped copper oxides are close to a quantum critical point, where the delicate energetic balance between different competing states leads to microscopic heterogeneity.