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  Quantum critical fluctuations in heavy fermion compounds

Schroeder, A., Aeppli, G., Coleman, P., Ramazashvili, R., Coldea, R., Adams, M., et al. (2002). Quantum critical fluctuations in heavy fermion compounds. International Journal of Modern Physics B, 16(20-22), 3031-3036. doi:10.1142/S0217979202013493.

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Schroeder, A., Author
Aeppli, G., Author
Coleman, P., Author
Ramazashvili, R., Author
Coldea, R., Author
Adams, M., Author
Bucher, E., Author
McMorrow, D. F., Author
Löhneysen, H. V., Author
Stockert, O.1, Author              
Affiliations:
1Oliver Stockert, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863476              

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 Abstract: 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.

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Language(s): eng - English
 Dates: 2002-08-30
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 18232
ISI: 000178300100031
DOI: 10.1142/S0217979202013493
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Title: International Journal of Modern Physics B
  Alternative Title : Int. J. Mod. Phys. B
Source Genre: Journal
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Pages: - Volume / Issue: 16 (20-22) Sequence Number: - Start / End Page: 3031 - 3036 Identifier: ISSN: 0217-9792