Suppression of the critical temperature of superconducting Ba (Fe 1-x Cox )2 As2 by point defects from proton irradiation

Yasuyuki Nakajima; Toshihiro Taen; Yuji Tsuchiya; Tsuyoshi Tamegai; Hisashi Kitamura; Takeshi Murakami

doi:10.1103/PhysRevB.82.220504

Suppression of the critical temperature of superconducting Ba (Fe _1-x Co_x )₂ As₂ by point defects from proton irradiation

Yasuyuki Nakajima, Toshihiro Taen, Yuji Tsuchiya, Tsuyoshi Tamegai, Hisashi Kitamura, Takeshi Murakami

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

112 Citations (Scopus)

Abstract

We report the effect of 3 MeV proton irradiation on the suppression of the critical temperature T_c in Ba (Fe_1-x Co_x) 2 As₂ single crystals at underdoping, optimal-doping, and overdoping levels. We find that T_c decreases and residual resistivity increases monotonically with increasing dose. We also find no upturn in low-temperature resistivity in contrast with the α -particle-irradiated NdFeAs(O,F), which suggests that defects induced by the proton irradiation behave as nonmagnetic scattering centers. The critical scattering rate for all samples estimated by three different ways is much higher than that expected in s_± -pairing scenario based on interband scattering due to antiferromagnetic spin fluctuation.

Original language	English
Article number	220504
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	82
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.82.220504
Publication status	Published - 2010 Dec 14
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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abstract = "We report the effect of 3 MeV proton irradiation on the suppression of the critical temperature Tc in Ba (Fe1-x Cox) 2 As2 single crystals at underdoping, optimal-doping, and overdoping levels. We find that Tc decreases and residual resistivity increases monotonically with increasing dose. We also find no upturn in low-temperature resistivity in contrast with the α -particle-irradiated NdFeAs(O,F), which suggests that defects induced by the proton irradiation behave as nonmagnetic scattering centers. The critical scattering rate for all samples estimated by three different ways is much higher than that expected in s± -pairing scenario based on interband scattering due to antiferromagnetic spin fluctuation.",

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AU - Nakajima, Yasuyuki

AU - Taen, Toshihiro

AU - Tsuchiya, Yuji

AU - Tamegai, Tsuyoshi

AU - Kitamura, Hisashi

AU - Murakami, Takeshi

PY - 2010/12/14

Y1 - 2010/12/14

N2 - We report the effect of 3 MeV proton irradiation on the suppression of the critical temperature Tc in Ba (Fe1-x Cox) 2 As2 single crystals at underdoping, optimal-doping, and overdoping levels. We find that Tc decreases and residual resistivity increases monotonically with increasing dose. We also find no upturn in low-temperature resistivity in contrast with the α -particle-irradiated NdFeAs(O,F), which suggests that defects induced by the proton irradiation behave as nonmagnetic scattering centers. The critical scattering rate for all samples estimated by three different ways is much higher than that expected in s± -pairing scenario based on interband scattering due to antiferromagnetic spin fluctuation.

AB - We report the effect of 3 MeV proton irradiation on the suppression of the critical temperature Tc in Ba (Fe1-x Cox) 2 As2 single crystals at underdoping, optimal-doping, and overdoping levels. We find that Tc decreases and residual resistivity increases monotonically with increasing dose. We also find no upturn in low-temperature resistivity in contrast with the α -particle-irradiated NdFeAs(O,F), which suggests that defects induced by the proton irradiation behave as nonmagnetic scattering centers. The critical scattering rate for all samples estimated by three different ways is much higher than that expected in s± -pairing scenario based on interband scattering due to antiferromagnetic spin fluctuation.

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Suppression of the critical temperature of superconducting Ba (Fe _1-x Co_x )₂ As₂ by point defects from proton irradiation

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