Observation of two distinct superconducting phases in Ce[Cu.sub.2][Si.sub.2]

We report the presence of two disconnected superconducting domes in the pressure-temperature phase diagram of partially germanium-substituted Ce[Cu.sub.2][Si.sub.2]. The lower density superconducting dome lies on the threshold of antiferromagnetic order, indicating magnetically mediated pairing, whe...

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Veröffentlicht in:	Science (American Association for the Advancement of Science) 2003-12, Vol.302 (5653), p.2104
Hauptverfasser:	Yuan, H.Q, Grosche, F.M, Deppe, M, Geibel, C, Sparn, G, Steglich, F
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Sprache:	eng
Schlagworte:	Degassing of metals Electric properties Metals Metals (Materials) Superconductivity
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creator	Yuan, H.Q Grosche, F.M Deppe, M Geibel, C Sparn, G Steglich, F
description	We report the presence of two disconnected superconducting domes in the pressure-temperature phase diagram of partially germanium-substituted Ce[Cu.sub.2][Si.sub.2]. The lower density superconducting dome lies on the threshold of antiferromagnetic order, indicating magnetically mediated pairing, whereas the higher density superconducting regime straddles a weakly first-order volume collapse, suggesting a pairing interaction based on spatially extended density fluctuations. Two distinct pairing mechanisms thus appear to operate in the single, wide, superconducting range of stoichiometric Ce[Cu.sub.2][Si.sub.2], both of which might apply more generally to other classes of correlated electron systems.
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source	JSTOR Archive Collection A-Z Listing; American Association for the Advancement of Science
subjects	Degassing of metals Electric properties Metals Metals (Materials) Superconductivity
title	Observation of two distinct superconducting phases in Ce[Cu.sub.2][Si.sub.2]
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