E138-04 - Forschungsbereich Quantum Materials E138-03 - Forschungsbereich Functional and Magnetic Materials
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Journal:
Physica B: Condensed Matter
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ISSN:
0921-4526
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Date (published):
1-Apr-2008
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Number of Pages:
3
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Publisher:
ELSEVIER
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Peer reviewed:
Yes
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Keywords:
Electrical and Electronic Engineering; Condensed Matter Physics; Electronic, Optical and Magnetic Materials; YbIr#_{2}Si#_{2}; Quantum critical point; Hall effect; Heavy fermion
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Abstract:
The well known intermetallic compound YbRh₂Si₂ (tetragonal ThCr₂Si₂ structure) is a heavy fermion system which orders antiferromagnetically at View the MathML source. Application of a magnetic field suppresses the Néel temperature continuously to zero and thus accesses a magnetic-field induced quantum critical point (QCP). The Hall coefficient shows a broadened step-like decrease as a function of applied field which extrapolates, at T=0, to a sharp step at the QCP, indicating that this QCP is not of spin density wave type. The iso-structural compound YbIr₂Si₂ (I-type) does not order magnetically down to the lowest temperatures but does, nevertheless, show non-Fermi liquid behaviour in wide regions of the temperature-field phase diagram. Here we use field-dependent Hall-effect measurements as a probe of a putative nearby QCP in YbIr₂Si₂.
