Signature of high T c above 25 K in high quality superconducting diamond

Hiroyuki Okazaki; Takanori Wakita; Takayuki Muro; Tetsuya Nakamura; Yuji Muraoka; Takayoshi Yokoya; Shin Ichiro Kurihara; Hiroshi Kawarada; Tamio Oguchi; Yoshihiko Takano

doi:10.1063/1.4907411

Signature of high T _c above 25 K in high quality superconducting diamond

Hiroyuki Okazaki, Takanori Wakita, Takayuki Muro, Tetsuya Nakamura, Yuji Muraoka, Takayoshi Yokoya, Shin Ichiro Kurihara, Hiroshi Kawarada, Tamio Oguchi, Yoshihiko Takano

School of Fundamental Science and Engineering

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

53 Citations (Scopus)

Abstract

We have observed zero resistivity above 10 K and an onset of resistivity reduction at 25.2 K in a heavily B-doped diamond film. However, the effective carrier concentration is similar to that of superconducting diamond with a lower T_c. We found that the carrier has a longer mean free path and lifetime than in the previous report, indicating that this highest T_c diamond has better crystallinity compared to that of other superconducting diamond films. In addition, the susceptibility shows a small transition above 20 K in the high quality diamond, suggesting a signature of superconductivity above 20 K. These results strongly suggest that heavier carrier doped defect-free crystalline diamond could give rise to high T_c diamond.

Original language	English
Article number	052601
Journal	Applied Physics Letters
Volume	106
Issue number	5
DOIs	https://doi.org/10.1063/1.4907411
Publication status	Published - 2015 Feb 2

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Signature of high T c above 25 K in high quality superconducting diamond",

abstract = "We have observed zero resistivity above 10 K and an onset of resistivity reduction at 25.2 K in a heavily B-doped diamond film. However, the effective carrier concentration is similar to that of superconducting diamond with a lower Tc. We found that the carrier has a longer mean free path and lifetime than in the previous report, indicating that this highest Tc diamond has better crystallinity compared to that of other superconducting diamond films. In addition, the susceptibility shows a small transition above 20 K in the high quality diamond, suggesting a signature of superconductivity above 20 K. These results strongly suggest that heavier carrier doped defect-free crystalline diamond could give rise to high Tc diamond.",

author = "Hiroyuki Okazaki and Takanori Wakita and Takayuki Muro and Tetsuya Nakamura and Yuji Muraoka and Takayoshi Yokoya and Kurihara, {Shin Ichiro} and Hiroshi Kawarada and Tamio Oguchi and Yoshihiko Takano",

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T1 - Signature of high T c above 25 K in high quality superconducting diamond

AU - Okazaki, Hiroyuki

AU - Wakita, Takanori

AU - Muro, Takayuki

AU - Nakamura, Tetsuya

AU - Muraoka, Yuji

AU - Yokoya, Takayoshi

AU - Kurihara, Shin Ichiro

AU - Kawarada, Hiroshi

AU - Oguchi, Tamio

AU - Takano, Yoshihiko

PY - 2015/2/2

Y1 - 2015/2/2

N2 - We have observed zero resistivity above 10 K and an onset of resistivity reduction at 25.2 K in a heavily B-doped diamond film. However, the effective carrier concentration is similar to that of superconducting diamond with a lower Tc. We found that the carrier has a longer mean free path and lifetime than in the previous report, indicating that this highest Tc diamond has better crystallinity compared to that of other superconducting diamond films. In addition, the susceptibility shows a small transition above 20 K in the high quality diamond, suggesting a signature of superconductivity above 20 K. These results strongly suggest that heavier carrier doped defect-free crystalline diamond could give rise to high Tc diamond.

AB - We have observed zero resistivity above 10 K and an onset of resistivity reduction at 25.2 K in a heavily B-doped diamond film. However, the effective carrier concentration is similar to that of superconducting diamond with a lower Tc. We found that the carrier has a longer mean free path and lifetime than in the previous report, indicating that this highest Tc diamond has better crystallinity compared to that of other superconducting diamond films. In addition, the susceptibility shows a small transition above 20 K in the high quality diamond, suggesting a signature of superconductivity above 20 K. These results strongly suggest that heavier carrier doped defect-free crystalline diamond could give rise to high Tc diamond.

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Signature of high T _c above 25 K in high quality superconducting diamond

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