| Issue |
Europhys. Lett.
Volume 74, Number 1, April 2006
|
|
|---|---|---|
| Page(s) | 138 - 144 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2005-10491-5 | |
| Published online | 22 February 2006 | |
Unconventional superconductivity in 
:
Relevance of spin-fluctuation-mediated pairing
1
School of Physics, University of Hyderabad - Hyderabad - 500 046, India
2
CITIMAC, University of Cantabria - 39005 Santander, Spain
Received:
11
October
2005
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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