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

24 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)

Access to Document

10.1143/JPSJ.73.194

Cite this

@article{25809a4171bc4dd4934953757004d012,

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

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",

author = "Yu Kawasaki and Kenji Ishida and Shinji Kawasaki and Takeshi Mito and Zheng, {Guo Qing} and Yoshio Kitaoka and Christoph Geibel and Frank Steglich",

year = "2004",

month = jan,

doi = "10.1143/JPSJ.73.194",

language = "English",

volume = "73",

pages = "194--197",

journal = "Journal of the Physical Society of Japan",

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publisher = "Physical Society of Japan",

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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

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