Exotic superconductivity in the coexistent phase of antiferromagnetism and superconductivity in CeCu2(Si0.98Ge0.02) 2: A Cu-NQR study under hydrostatic pressure

Yu Kawasaki; Kenji Ishida; Shinji Kawasaki; Takeshi Mito; Guo Qing Zheng; Yoshio Kitaoka; Christoph Geibel; Frank Steglich

doi:10.1143/JPSJ.73.194

Exotic superconductivity in the coexistent phase of antiferromagnetism and superconductivity in CeCu₂(Si_0.98Ge_0.02) ₂: A Cu-NQR study under hydrostatic pressure

Yu Kawasaki, Kenji Ishida, Shinji Kawasaki, Takeshi Mito, Guo Qing Zheng, Yoshio Kitaoka, Christoph Geibel, Frank Steglich

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

Abstract

We report a pressure (P) effect on CeCu₂(Si _0.98Ge_0.02)₂ where an antiferromagnetic (AFM) order at T_N ∼ 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 T_c 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	https://doi.org/10.1143/JPSJ.73.194
Publication status	Published - Jan 2004
Externally published	Yes

Keywords

Heavy-fermion superconductivity
Impurity effect
Nuclear magnetic resonance
Pressure effect
Quantum critical point

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1143/JPSJ.73.194

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Exotic superconductivity in the coexistent phase of antiferromagnetism and superconductivity in CeCu₂(Si_0.98Ge_0.02) 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 › peer-review

Kawasaki, Yu ; Ishida, Kenji ; Kawasaki, Shinji ; Mito, Takeshi ; Zheng, Guo Qing ; Kitaoka, Yoshio ; Geibel, Christoph ; Steglich, Frank. / Exotic superconductivity in the coexistent phase of antiferromagnetism and superconductivity in CeCu₂(Si_0.98Ge_0.02) ₂ : A Cu-NQR study under hydrostatic pressure. In: journal of the physical society of japan. 2004 ; Vol. 73, No. 1. pp. 194-197.

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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.",

keywords = "Heavy-fermion superconductivity, Impurity effect, Nuclear magnetic resonance, Pressure effect, Quantum critical point",

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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.

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