Abstract
We report the systematic evolution of the superconducting (SC) characteristics of the heavy-fermion (HF) superconductor CeCoIn5 via nuclear-quadrupole-resonance (NQR) measurement under pressure (P). The application of P significantly suppresses the nuclear spin-lattice relaxation rate 1/T1 that is dominated by antiferromagnetic (AFM) spin fluctuations (SFs) specific to a quantum critical point (QCP). It is demonstrated that the marked suppression of AFM SFs leads to a reduction in the SC energy gap or in the coupling strength of the Cooper pair. Tc, nevertheless, increases with increasing P due to the increase in HF bandwidth. This is expected to make the lifetime of quasi-particles sufficiently long.
| Original language | English |
|---|---|
| Pages (from-to) | 2073-2076 |
| Number of pages | 4 |
| Journal | Journal of the Physical Society of Japan |
| Volume | 73 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - Aug 2004 |
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Keywords
- CeCoIn
- Heavy fermion
- NQR
- Pressure
- Superconductivity
ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Magnetic criticality and unconventional superconductivity in CeCoIn 5 : Study of 115in-nuclear quadrupole resonance under pressure. / Yashima, M.; Kawasaki, Shinji; Kawasaki, Y.; Zheng, Guo-Qing; Kitaoka, Y.; Shishido, H.; Settai, R.; Haga, Y.; Onuki, Y.
In: Journal of the Physical Society of Japan, Vol. 73, No. 8, 08.2004, p. 2073-2076.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Magnetic criticality and unconventional superconductivity in CeCoIn 5
T2 - Study of 115in-nuclear quadrupole resonance under pressure
AU - Yashima, M.
AU - Kawasaki, Shinji
AU - Kawasaki, Y.
AU - Zheng, Guo-Qing
AU - Kitaoka, Y.
AU - Shishido, H.
AU - Settai, R.
AU - Haga, Y.
AU - Onuki, Y.
PY - 2004/8
Y1 - 2004/8
N2 - We report the systematic evolution of the superconducting (SC) characteristics of the heavy-fermion (HF) superconductor CeCoIn5 via nuclear-quadrupole-resonance (NQR) measurement under pressure (P). The application of P significantly suppresses the nuclear spin-lattice relaxation rate 1/T1 that is dominated by antiferromagnetic (AFM) spin fluctuations (SFs) specific to a quantum critical point (QCP). It is demonstrated that the marked suppression of AFM SFs leads to a reduction in the SC energy gap or in the coupling strength of the Cooper pair. Tc, nevertheless, increases with increasing P due to the increase in HF bandwidth. This is expected to make the lifetime of quasi-particles sufficiently long.
AB - We report the systematic evolution of the superconducting (SC) characteristics of the heavy-fermion (HF) superconductor CeCoIn5 via nuclear-quadrupole-resonance (NQR) measurement under pressure (P). The application of P significantly suppresses the nuclear spin-lattice relaxation rate 1/T1 that is dominated by antiferromagnetic (AFM) spin fluctuations (SFs) specific to a quantum critical point (QCP). It is demonstrated that the marked suppression of AFM SFs leads to a reduction in the SC energy gap or in the coupling strength of the Cooper pair. Tc, nevertheless, increases with increasing P due to the increase in HF bandwidth. This is expected to make the lifetime of quasi-particles sufficiently long.
KW - CeCoIn
KW - Heavy fermion
KW - NQR
KW - Pressure
KW - Superconductivity
UR - http://www.scopus.com/inward/record.url?scp=18144426282&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=18144426282&partnerID=8YFLogxK
U2 - 10.1143/JPSJ.73.2073
DO - 10.1143/JPSJ.73.2073
M3 - Article
AN - SCOPUS:18144426282
VL - 73
SP - 2073
EP - 2076
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 8
ER -