Volume 74, Number 1, April 2006
|Page(s)||138 - 144|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||22 February 2006|
Unconventional superconductivity in : Relevance of spin-fluctuation-mediated pairing
School of Physics, University of Hyderabad - Hyderabad - 500 046, India
2 CITIMAC, University of Cantabria - 39005 Santander, Spain
Accepted: 31 January 2006
We provide experimental evidence for unconventional superconductivity in a newly synthesized three-dimensional nearly antiferromagnetic metal, , and report results that indicate that the antiferromagnetic spin-fluctuation-mediated pairing may have a direct bearing on this phenomenon. Compared to the heavy-fermion systems, the superconducting transition temperature is nearly 10 times higher, superconductivity is robust against impurities and the specific-heat anomaly associated with the superconducting transition is extremely weak, or even absent. Our results are consistent with certain previously reported theoretical criteria for observing antiferromagnetic spin-fluctuation-mediated superconductivity at elevated temperatures.
PACS: 74.20.Mn – Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.) / 74.25.-q – Properties of type I and type II superconductors / 74.70.Dd – Ternary, quaternary, and multinary compounds (including Chevrel phases, borocarbides, etc.)
© EDP Sciences, 2006
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