Abstract
We report a pressure (P) effect on CeCu2(Si 0.98Ge0.02)2 where an antiferromagnetic (AFM) order at TN ∼ 0.75 K coexists with superconductivity below T c ∼ 0.4 K. At pressures exceeding P = 0.19 GPa, the AFM order is suppressed, which demonstrates that the sudden emergence of AFM order due to the Ge doping is ascribed to the intrinsic lattice expansion. The exotic superconductivity at P = 0 GPa is found to evolve into a typical heavy-fermion one with a line-node gap above P = 0.91 GPa. We highlight that the anomalous enhancement in nuclear spin-lattice relaxation rate 1/T1 that follows a T1T = const. behavior well below Tc at P = 0 GPa is characterized by the persistence of low-lying magnetic excitations, which may be inherent to the coexistent state of antiferromagnetism and superconductivity.
| Original language | English |
|---|---|
| Pages (from-to) | 194-197 |
| Number of pages | 4 |
| Journal | Journal of the Physical Society of Japan |
| Volume | 73 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jan 2004 |
| Externally published | Yes |
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Keywords
- Heavy-fermion superconductivity
- Impurity effect
- Nuclear magnetic resonance
- Pressure effect
- Quantum critical point
ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Exotic superconductivity in the coexistent phase of antiferromagnetism and superconductivity in CeCu2(Si0.98Ge0.02) 2 : A Cu-NQR study under hydrostatic pressure. / Kawasaki, Yu; Ishida, Kenji; Kawasaki, Shinji; Mito, Takeshi; Zheng, Guo-Qing; Kitaoka, Yoshio; Geibel, Christoph; Steglich, Frank.
In: Journal of the Physical Society of Japan, Vol. 73, No. 1, 01.2004, p. 194-197.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Exotic superconductivity in the coexistent phase of antiferromagnetism and superconductivity in CeCu2(Si0.98Ge0.02) 2
T2 - A Cu-NQR study under hydrostatic pressure
AU - Kawasaki, Yu
AU - Ishida, Kenji
AU - Kawasaki, Shinji
AU - Mito, Takeshi
AU - Zheng, Guo-Qing
AU - Kitaoka, Yoshio
AU - Geibel, Christoph
AU - Steglich, Frank
PY - 2004/1
Y1 - 2004/1
N2 - We report a pressure (P) effect on CeCu2(Si 0.98Ge0.02)2 where an antiferromagnetic (AFM) order at TN ∼ 0.75 K coexists with superconductivity below T c ∼ 0.4 K. At pressures exceeding P = 0.19 GPa, the AFM order is suppressed, which demonstrates that the sudden emergence of AFM order due to the Ge doping is ascribed to the intrinsic lattice expansion. The exotic superconductivity at P = 0 GPa is found to evolve into a typical heavy-fermion one with a line-node gap above P = 0.91 GPa. We highlight that the anomalous enhancement in nuclear spin-lattice relaxation rate 1/T1 that follows a T1T = const. behavior well below Tc at P = 0 GPa is characterized by the persistence of low-lying magnetic excitations, which may be inherent to the coexistent state of antiferromagnetism and superconductivity.
AB - We report a pressure (P) effect on CeCu2(Si 0.98Ge0.02)2 where an antiferromagnetic (AFM) order at TN ∼ 0.75 K coexists with superconductivity below T c ∼ 0.4 K. At pressures exceeding P = 0.19 GPa, the AFM order is suppressed, which demonstrates that the sudden emergence of AFM order due to the Ge doping is ascribed to the intrinsic lattice expansion. The exotic superconductivity at P = 0 GPa is found to evolve into a typical heavy-fermion one with a line-node gap above P = 0.91 GPa. We highlight that the anomalous enhancement in nuclear spin-lattice relaxation rate 1/T1 that follows a T1T = const. behavior well below Tc at P = 0 GPa is characterized by the persistence of low-lying magnetic excitations, which may be inherent to the coexistent state of antiferromagnetism and superconductivity.
KW - Heavy-fermion superconductivity
KW - Impurity effect
KW - Nuclear magnetic resonance
KW - Pressure effect
KW - Quantum critical point
UR - http://www.scopus.com/inward/record.url?scp=21144455441&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=21144455441&partnerID=8YFLogxK
U2 - 10.1143/JPSJ.73.194
DO - 10.1143/JPSJ.73.194
M3 - Article
AN - SCOPUS:21144455441
VL - 73
SP - 194
EP - 197
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 1
ER -