Published 2010 | Version v1
Journal article Metadata-only

Magnetic fluctuations and superconductivity in Fe pnictides probed by electron spin resonance

Creators

  • 1. Experimentalphysik V, Center for Electronic Correlations and Magnetism, Institute for Physics, Augsburg University, D-86135 Augsburg (Germany)
  • 2. I. Physik. Institut, Georg-August-Universitaet Goettingen, D-37077 Goettingen (Germany)

Description

The electron spin resonance absorption spectrum of Eu2+ ions serves as a probe of the normal and superconducting state in Eu0.5K0.5Fe2As2. The spin-lattice relaxation rate 1/T1ESR obtained from the ESR linewidth exhibits a Korringa-like linear increase with temperature above TC evidencing a normal Fermi-liquid behavior. Below 45 K deviations from the Korringa-law occur which are ascribed to enhanced magnetic fluctuations upon approaching the superconducting transition. Below TC the spin lattice relaxation rate 1/T1ESR follows a T1.5-behavior without the appearance of a coherence peak.

Additional details

Identifiers

URL
http://www.dpg-verhandlungen.de;

Publishing Information

Journal Title
Verhandlungen der Deutschen Physikalischen Gesellschaft
Journal Issue
Regensburg 2010 issue
Series
Also available as printed version: Verhandlungen der Deutschen Physikalischen Gesellschaft v. 45(3)
Journal Page Range
[1 p.]
ISSN
0420-0195
CODEN
VDPEAZ

Conference

Title
DPG Spring meeting 2010 of the condensed matter section with the divisions biological physics, chemical and polymer physics, crystallography, dielectric solids, dynamics and statistical physics, low temperature physics, magnetism, metal and material physics, physics of socio-economic systems, radiation and medical physics, semiconductor physics, surface science, thin films, vacuum science and technology as well as the working group industry and business, with job market, symposia, teachers' days, tutorials, exhibition of scientific instruments and literature
Dates
21-26 Mar 2010
Place
Regensburg (Germany)

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
42067961
Subject category
S36: MATERIALS SCIENCE;
Resource subtype / Literary indicator
Conference
Descriptors DEI
ABSORPTION SPECTRA; ELECTRON SPIN RESONANCE; EUROPIUM ARSENIDES; EUROPIUM IONS; FLUCTUATIONS; IRON ARSENIDES; LINE WIDTHS; MAGNETIC PROPERTIES; POTASSIUM COMPOUNDS; RELAXATION TIME; SPIN-LATTICE RELAXATION; SUPERCONDUCTIVITY; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0013-0065 K
Descriptors DEC
ALKALI METAL COMPOUNDS; ARSENIC COMPOUNDS; ARSENIDES; CHARGED PARTICLES; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; EUROPIUM COMPOUNDS; IONS; IRON COMPOUNDS; MAGNETIC RESONANCE; PHYSICAL PROPERTIES; PNICTIDES; RARE EARTH COMPOUNDS; RELAXATION; RESONANCE; SPECTRA; TEMPERATURE RANGE; TRANSITION ELEMENT COMPOUNDS; VARIATIONS

Optional Information

Notes
Session: TT 34.10 Do 16:30; No further information available