Field dependence of π-band superconducting gap in MgB2 thin films from point-contact spectroscopy

Yan Huang; Yong Lei Wang; Lei Shan; Ying Jia; Huan Yang; Hai Hu Wen; Cheng Gang Zhuang; Qi Li; Yi Cui; Xiao Xing Xi

doi:10.1088/0256-307X/25/6/084

Field dependence of π-band superconducting gap in MgB₂ thin films from point-contact spectroscopy

Yan Huang, Yong Lei Wang, Lei Shan, Ying Jia, Huan Yang, Hai Hu Wen, Cheng Gang Zhuang, Qi Li, Yi Cui, Xiao Xing Xi

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3 Scopus citations

Abstract

We present the results of point-contact spectroscopy measurements on high-quality epitaxial MgB₂ thin films with injected current along the c-axis. The temperature and field dependences of π-band properties with the field parallel to (H_||) or perpendicular to (H_⊥) the c-axis are investigated in detail. When a magnetic field is applied, either parallel or perpendicular to the c-axis, the density of the quasiparticle state (DOS) of the π-band proliferates quickly with increasing field, while the gap amplitude of the π-band decreases slowly, which is different from the recent theoretical calculations, showing a field dependent competition between the interband scattering and the pair-breaking effects.

Original language	English (US)
Pages (from-to)	2228-2231
Number of pages	4
Journal	Chinese Physics Letters
Volume	25
Issue number	6
DOIs	https://doi.org/10.1088/0256-307X/25/6/084
State	Published - Jun 1 2008

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1088/0256-307X/25/6/084

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title = "Field dependence of π-band superconducting gap in MgB2 thin films from point-contact spectroscopy",

abstract = "We present the results of point-contact spectroscopy measurements on high-quality epitaxial MgB2 thin films with injected current along the c-axis. The temperature and field dependences of π-band properties with the field parallel to (H||) or perpendicular to (H⊥) the c-axis are investigated in detail. When a magnetic field is applied, either parallel or perpendicular to the c-axis, the density of the quasiparticle state (DOS) of the π-band proliferates quickly with increasing field, while the gap amplitude of the π-band decreases slowly, which is different from the recent theoretical calculations, showing a field dependent competition between the interband scattering and the pair-breaking effects.",

author = "Yan Huang and Wang, {Yong Lei} and Lei Shan and Ying Jia and Huan Yang and Wen, {Hai Hu} and Zhuang, {Cheng Gang} and Qi Li and Yi Cui and Xi, {Xiao Xing}",

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TY - JOUR

T1 - Field dependence of π-band superconducting gap in MgB2 thin films from point-contact spectroscopy

AU - Huang, Yan

AU - Wang, Yong Lei

AU - Shan, Lei

AU - Jia, Ying

AU - Yang, Huan

AU - Wen, Hai Hu

AU - Zhuang, Cheng Gang

AU - Li, Qi

AU - Cui, Yi

AU - Xi, Xiao Xing

PY - 2008/6/1

Y1 - 2008/6/1

N2 - We present the results of point-contact spectroscopy measurements on high-quality epitaxial MgB2 thin films with injected current along the c-axis. The temperature and field dependences of π-band properties with the field parallel to (H||) or perpendicular to (H⊥) the c-axis are investigated in detail. When a magnetic field is applied, either parallel or perpendicular to the c-axis, the density of the quasiparticle state (DOS) of the π-band proliferates quickly with increasing field, while the gap amplitude of the π-band decreases slowly, which is different from the recent theoretical calculations, showing a field dependent competition between the interband scattering and the pair-breaking effects.

AB - We present the results of point-contact spectroscopy measurements on high-quality epitaxial MgB2 thin films with injected current along the c-axis. The temperature and field dependences of π-band properties with the field parallel to (H||) or perpendicular to (H⊥) the c-axis are investigated in detail. When a magnetic field is applied, either parallel or perpendicular to the c-axis, the density of the quasiparticle state (DOS) of the π-band proliferates quickly with increasing field, while the gap amplitude of the π-band decreases slowly, which is different from the recent theoretical calculations, showing a field dependent competition between the interband scattering and the pair-breaking effects.

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JO - Chinese Physics Letters

JF - Chinese Physics Letters

IS - 6

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Field dependence of π-band superconducting gap in MgB₂ thin films from point-contact spectroscopy

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