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          Institute: MPI für Chemische Physik fester Stoffe     Collection: publications 2002     Display Documents

ID: 18232.0, MPI für Chemische Physik fester Stoffe / publications 2002
Quantum critical fluctuations in heavy fermion compounds
Authors:Schroeder, A.; Aeppli, G.; Coleman, P.; Ramazashvili, R.; Coldea, R.; Adams, M.; Bucher, E.; McMorrow, D. F.; Löhneysen, H. V.; Stockert, O.
Date of Publication (YYYY-MM-DD):2002-08-30
Title of Journal:International Journal of Modern Physics B
Journal Abbrev.:Int. J. Mod. Phys. B
Issue / Number:20-22
Start Page:3031
End Page:3036
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:The electronic properties of heavy fermion alloys are dominated by spin fluctuations which are expected to become critical when tuned by pressure to a quantum critical point (QCP), entering a magnetic ordered state. Apart from the onset of exotic superconductivity, unexpected "normal conducting" behavior is found close to the QCP, which does not seem only to escape the conventional view of metals (Fermi liquids) but also the "conventional view" of an antiferromagnetic quantum phase transition in these f-metals. So far only few compounds have been investigated by neutron scattering to directly reveal the critical fluctuations spectrum. In CeCu5 9Au0 1 the fluctuations develop an unusual energy dependence, characterized by an exponent alpha = 0.75, which persist over the entire Brillouin zone, provoking an unexpected local non Fermi liquid behavior. The same unusual exponent derived from E/T scaling determines the H/T scaling of the uniform magnetization. Recent neutron scattering data in magnetic fields further confirm this picture of nearly free local magnetic moments (modified by a) emerging at the antiferromagnetic QCP in this strongly correlated electron system.
Comment of the Author/Creator:Date: 2002, AUG 30
External Publication Status:published
Document Type:Article
Communicated by:Ina Wanschura
Affiliations:MPI für chemische Physik fester Stoffe
External Affiliations:Kent State Univ, Dept Phys, Kent, OH 44242 USA; Kent State Univ, Dept Phys, Kent, OH 44242 USA; Univ Karlsruhe, Inst Phys, D-76128 Karlsruhe, Germany; NEC Res, Princeton, NJ 08540 USA; Rutgers State Univ, Serin Lab, Piscataway, NJ 08855 USA; Univ Illinois, Dept Phys, Urbana, IL 61801 USA; Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England; Rutherford Appleton Lab, CCLRC, ISIS Facil, Didcot OX11 0QX, Oxon, England; Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA; Riso Natl Lab, DK-4000 Roskilde, Denmark; Forschungszentrum Karlsruhe, Inst Festkorperforsch, D-76201 Karlsruhe, Germany; Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany
Identifiers:ISI:000178300100031 [ID No:1]
ISSN:0217-9792 [ID No:2]
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