Exotic magnetic and superconducting phases in CeCu2 Si 2 close to magnetically ordered state: Cu-NQR study

Y. Kawasaki; K. Obinata; K. Ishida; T. Mito; G. Q. Zheng; Y. Kitaoka; C. Geibel; F. Steglich

doi:10.1016/S0304-8853(00)01341-X

Exotic magnetic and superconducting phases in CeCu₂ Si ₂ close to magnetically ordered state: Cu-NQR study

Y. Kawasaki, K. Obinata, K. Ishida, T. Mito, G. Q. Zheng, Y. Kitaoka, C. Geibel, F. Steglich

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

Abstract

We report Cu-NQR results under pressure on heavy-fermion (HF) superconductor CeCu₂Si₂ close to a magnetic phase, Ce _0.99Cu_2.02Si₂ and CeCu₂(Si _0.98Ge_0.02)₂. It is found that an application of a minute pressure exceeding 0.3 GPa markedly suppresses low-energy magnetic fluctuations observed at ambient pressure (P = 0) in Ce_0.99Cu _2.02Si₂. Correspondingly, anomalous superconducting (SC) characteristics evolve into conventional HF-SC ones with increasing pressure. In the latter, the Ge substitution works as a negative chemical pressure. CeCu₂(Si_0.98Ge_0.02)₂ reveals a magnetic phase transition at T_N= 0.75 K followed by the SC phase transition at T_c ∼ 0.4 K at P = 0. It is suggested experimentally that the magnetic fluctuations seen in Ce_0.99Cu _2.02Si₂ at P = 0 possesses a quantum critical character of both SC and magnetically ordered states.

Original language	English
Pages (from-to)	374-375
Number of pages	2
Journal	Journal of Magnetism and Magnetic Materials
Volume	226-230
Issue number	PART I
DOIs	https://doi.org/10.1016/S0304-8853(00)01341-X
Publication status	Published - 2001
Externally published	Yes

Keywords

Heavy-fermion compounds
NMR
Pressure effect
Superconductivity

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1016/S0304-8853(00)01341-X

Cite this

@article{12e9cc35b4bc4c418ba9617a81e9ee64,

title = "Exotic magnetic and superconducting phases in CeCu2 Si 2 close to magnetically ordered state: Cu-NQR study",

abstract = "We report Cu-NQR results under pressure on heavy-fermion (HF) superconductor CeCu2Si2 close to a magnetic phase, Ce 0.99Cu2.02Si2 and CeCu2(Si 0.98Ge0.02)2. It is found that an application of a minute pressure exceeding 0.3 GPa markedly suppresses low-energy magnetic fluctuations observed at ambient pressure (P = 0) in Ce0.99Cu 2.02Si2. Correspondingly, anomalous superconducting (SC) characteristics evolve into conventional HF-SC ones with increasing pressure. In the latter, the Ge substitution works as a negative chemical pressure. CeCu2(Si0.98Ge0.02)2 reveals a magnetic phase transition at TN= 0.75 K followed by the SC phase transition at Tc ∼ 0.4 K at P = 0. It is suggested experimentally that the magnetic fluctuations seen in Ce0.99Cu 2.02Si2 at P = 0 possesses a quantum critical character of both SC and magnetically ordered states.",

keywords = "Heavy-fermion compounds, NMR, Pressure effect, Superconductivity",

author = "Y. Kawasaki and K. Obinata and K. Ishida and T. Mito and Zheng, {G. Q.} and Y. Kitaoka and C. Geibel and F. Steglich",

note = "Funding Information: This work was supported by the COE Research (10CE2004) in Grant-in-Aid for Scientific Research from the Ministry of Education, Sport, Science and Culture, Japan.",

year = "2001",

doi = "10.1016/S0304-8853(00)01341-X",

language = "English",

volume = "226-230",

pages = "374--375",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier",

number = "PART I",

}

TY - JOUR

T1 - Exotic magnetic and superconducting phases in CeCu2 Si 2 close to magnetically ordered state

T2 - Cu-NQR study

AU - Kawasaki, Y.

AU - Obinata, K.

AU - Ishida, K.

AU - Mito, T.

AU - Zheng, G. Q.

AU - Kitaoka, Y.

AU - Geibel, C.

AU - Steglich, F.

N1 - Funding Information: This work was supported by the COE Research (10CE2004) in Grant-in-Aid for Scientific Research from the Ministry of Education, Sport, Science and Culture, Japan.

PY - 2001

Y1 - 2001

N2 - We report Cu-NQR results under pressure on heavy-fermion (HF) superconductor CeCu2Si2 close to a magnetic phase, Ce 0.99Cu2.02Si2 and CeCu2(Si 0.98Ge0.02)2. It is found that an application of a minute pressure exceeding 0.3 GPa markedly suppresses low-energy magnetic fluctuations observed at ambient pressure (P = 0) in Ce0.99Cu 2.02Si2. Correspondingly, anomalous superconducting (SC) characteristics evolve into conventional HF-SC ones with increasing pressure. In the latter, the Ge substitution works as a negative chemical pressure. CeCu2(Si0.98Ge0.02)2 reveals a magnetic phase transition at TN= 0.75 K followed by the SC phase transition at Tc ∼ 0.4 K at P = 0. It is suggested experimentally that the magnetic fluctuations seen in Ce0.99Cu 2.02Si2 at P = 0 possesses a quantum critical character of both SC and magnetically ordered states.

AB - We report Cu-NQR results under pressure on heavy-fermion (HF) superconductor CeCu2Si2 close to a magnetic phase, Ce 0.99Cu2.02Si2 and CeCu2(Si 0.98Ge0.02)2. It is found that an application of a minute pressure exceeding 0.3 GPa markedly suppresses low-energy magnetic fluctuations observed at ambient pressure (P = 0) in Ce0.99Cu 2.02Si2. Correspondingly, anomalous superconducting (SC) characteristics evolve into conventional HF-SC ones with increasing pressure. In the latter, the Ge substitution works as a negative chemical pressure. CeCu2(Si0.98Ge0.02)2 reveals a magnetic phase transition at TN= 0.75 K followed by the SC phase transition at Tc ∼ 0.4 K at P = 0. It is suggested experimentally that the magnetic fluctuations seen in Ce0.99Cu 2.02Si2 at P = 0 possesses a quantum critical character of both SC and magnetically ordered states.

KW - Heavy-fermion compounds

KW - NMR

KW - Pressure effect

KW - Superconductivity

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U2 - 10.1016/S0304-8853(00)01341-X

DO - 10.1016/S0304-8853(00)01341-X

M3 - Article

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SN - 0304-8853

VL - 226-230

SP - 374

EP - 375

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

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