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Title: Evolution of low-energy spin dynamics in the electron-doped high-transition-temperature superconductor Pr 0.88 LaCe 0.12 CuO 4 - δ

Abstract

We use inelastic 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 (Tc ≈ 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 Tc 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.

Authors:
 [1];  [1];  [2];  [3];  [4];  [4];  [5];  [6];  [6];  [7]
  1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
  2. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Neutron Scattering
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research; Univ. of Maryland, College Park, MD (United States). Dept. of Materials Science and Engineering
  5. Univ. of Virginia, Charlottesville, VA (United States). Dept. of Physics
  6. Central Research Inst. of Electric Power Industry, Komae, Tokyo (Japan)
  7. Rice Univ., Houston, TX (United States). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF); Robert A. Welch foundation
OSTI Identifier:
1360012
DOE Contract Number:  
AC05-00OR22725; FG02-05ER46202; DMR-0424125; DMR-0453804
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 74; Journal Issue: 14; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Wilson, Stephen D., Li, Shiliang, Dai, Pengcheng, Bao, Wei, Chung, Jae-Ho, Kang, H. J., Lee, Seung-Hun, Komiya, Seiki, Ando, Yoichi, and Si, Qimiao. Evolution of low-energy spin dynamics in the electron-doped high-transition-temperature superconductor Pr0.88LaCe0.12CuO4-δ. United States: N. p., 2006. Web. doi:10.1103/PhysRevB.74.144514.
Wilson, Stephen D., Li, Shiliang, Dai, Pengcheng, Bao, Wei, Chung, Jae-Ho, Kang, H. J., Lee, Seung-Hun, Komiya, Seiki, Ando, Yoichi, & Si, Qimiao. Evolution of low-energy spin dynamics in the electron-doped high-transition-temperature superconductor Pr0.88LaCe0.12CuO4-δ. United States. https://doi.org/10.1103/PhysRevB.74.144514
Wilson, Stephen D., Li, Shiliang, Dai, Pengcheng, Bao, Wei, Chung, Jae-Ho, Kang, H. J., Lee, Seung-Hun, Komiya, Seiki, Ando, Yoichi, and Si, Qimiao. 2006. "Evolution of low-energy spin dynamics in the electron-doped high-transition-temperature superconductor Pr0.88LaCe0.12CuO4-δ". United States. https://doi.org/10.1103/PhysRevB.74.144514.
@article{osti_1360012,
title = {Evolution of low-energy spin dynamics in the electron-doped high-transition-temperature superconductor Pr0.88LaCe0.12CuO4-δ},
author = {Wilson, Stephen D. and Li, Shiliang and Dai, Pengcheng and Bao, Wei and Chung, Jae-Ho and Kang, H. J. and Lee, Seung-Hun and Komiya, Seiki and Ando, Yoichi and Si, Qimiao},
abstractNote = {We use inelastic neutron scattering to explore the evolution of the low energy spin dynamics in the electron-doped cuprate Pr0.88LaCe0.12CuO4-δ (PLCCO) as the system is tuned from its nonsuperconducting, as-grown antiferromagnetic (AF) state into an optimally doped superconductor (Tc ≈ 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 Tc 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.},
doi = {10.1103/PhysRevB.74.144514},
url = {https://www.osti.gov/biblio/1360012}, journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 14,
volume = 74,
place = {United States},
year = {Mon Oct 23 00:00:00 EDT 2006},
month = {Mon Oct 23 00:00:00 EDT 2006}
}