Evolution of low-energy spin dynamics in the electron-doped high-transition-temperature superconductor ${\mathrm{Pr}}_{0.88}{\mathrm{LaCe}}_{0.12}{\mathrm{CuO}}_{4-\delta }$

Journal Article · Mon Oct 23 04:00:00 EDT 2006 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.74.144514· OSTI ID:1360012

Wilson, Stephen D. ^[1]; Li, Shiliang ^[1]; Dai, Pengcheng ^[2]; Bao, Wei ^[3]; Chung, Jae-Ho ^[4]; Kang, H. J. ^[4]; Lee, Seung-Hun ^[5]; Komiya, Seiki ^[6]; Ando, Yoichi ^[6]; Si, Qimiao ^[7]

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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

We use inelastic neutron scattering to explore the evolution of the low energy spin dynamics in the electron-doped cuprate ${\mathrm{Pr}}_{0.88}{\mathrm{LaCe}}_{0.12}{\mathrm{CuO}}_{4-\delta }$ (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.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
• Sponsoring Organization: USDOE Office of Science (SC); National Science Foundation (NSF); Robert A. Welch foundation
• DOE Contract Number: AC05-00OR22725; FG02-05ER46202
• OSTI ID: 1360012
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 14 Vol. 74; ISSN 1098-0121; ISSN PRBMDO
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY