NQR study of pressure induced superconductivity in CeCu2Si2

K. Fujiwara; Y. Okazaki; Y. Hata; K. Miyoshi; J. Takeuchi; T. C. Kobayashi; C. Geibel; F. Steglich

doi:10.1002/pssb.200983050

NQR study of pressure induced superconductivity in CeCu₂Si₂

K. Fujiwara, Y. Okazaki, Y. Hata, K. Miyoshi, J. Takeuchi, T. C. Kobayashi, C. Geibel, F. Steglich

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4 Citations (Scopus)

Abstract

We have measured nuclear quadrupole resonance (NQR) for ^*Cu nuclei under high pressure up to 4.8 GPa.A linear increase in NQR frequency ^*νQ of ^*Cu nuclei was observed below 3 GPa. However, ^*νQ deviates gradually from the linear relation above 3.5 GPa. The downward deviation is associated with a change of valence and consistent with the results of band calculations with the structural parameters under pressure. Antiferromagnetic (AFM) spin fluctuations are drastically suppressed with increasing pressure, whereas T_c increases from 0.7K at ambient pressure to 1.64K at 4.2 GPa. We have found that bulk superconductivity suddenly disappears at 4.8 GPa accompanied with a rapid decrease in the density of states at the Fermi level.

Original language	English
Pages (from-to)	608-610
Number of pages	3
Journal	Physica Status Solidi (B) Basic Research
Volume	247
Issue number	3
DOIs	https://doi.org/10.1002/pssb.200983050
Publication status	Published - Mar 2010

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "NQR study of pressure induced superconductivity in CeCu2Si2",

abstract = "We have measured nuclear quadrupole resonance (NQR) for *Cu nuclei under high pressure up to 4.8 GPa.A linear increase in NQR frequency *νQ of *Cu nuclei was observed below 3 GPa. However, *νQ deviates gradually from the linear relation above 3.5 GPa. The downward deviation is associated with a change of valence and consistent with the results of band calculations with the structural parameters under pressure. Antiferromagnetic (AFM) spin fluctuations are drastically suppressed with increasing pressure, whereas Tc increases from 0.7K at ambient pressure to 1.64K at 4.2 GPa. We have found that bulk superconductivity suddenly disappears at 4.8 GPa accompanied with a rapid decrease in the density of states at the Fermi level.",

author = "K. Fujiwara and Y. Okazaki and Y. Hata and K. Miyoshi and J. Takeuchi and Kobayashi, {T. C.} and C. Geibel and F. Steglich",

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T1 - NQR study of pressure induced superconductivity in CeCu2Si2

AU - Fujiwara, K.

AU - Okazaki, Y.

AU - Hata, Y.

AU - Miyoshi, K.

AU - Takeuchi, J.

AU - Kobayashi, T. C.

AU - Geibel, C.

AU - Steglich, F.

PY - 2010/3

Y1 - 2010/3

N2 - We have measured nuclear quadrupole resonance (NQR) for *Cu nuclei under high pressure up to 4.8 GPa.A linear increase in NQR frequency *νQ of *Cu nuclei was observed below 3 GPa. However, *νQ deviates gradually from the linear relation above 3.5 GPa. The downward deviation is associated with a change of valence and consistent with the results of band calculations with the structural parameters under pressure. Antiferromagnetic (AFM) spin fluctuations are drastically suppressed with increasing pressure, whereas Tc increases from 0.7K at ambient pressure to 1.64K at 4.2 GPa. We have found that bulk superconductivity suddenly disappears at 4.8 GPa accompanied with a rapid decrease in the density of states at the Fermi level.

AB - We have measured nuclear quadrupole resonance (NQR) for *Cu nuclei under high pressure up to 4.8 GPa.A linear increase in NQR frequency *νQ of *Cu nuclei was observed below 3 GPa. However, *νQ deviates gradually from the linear relation above 3.5 GPa. The downward deviation is associated with a change of valence and consistent with the results of band calculations with the structural parameters under pressure. Antiferromagnetic (AFM) spin fluctuations are drastically suppressed with increasing pressure, whereas Tc increases from 0.7K at ambient pressure to 1.64K at 4.2 GPa. We have found that bulk superconductivity suddenly disappears at 4.8 GPa accompanied with a rapid decrease in the density of states at the Fermi level.

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NQR study of pressure induced superconductivity in CeCu₂Si₂

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