| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Upper Critical Fields and Anisotropy of BaFe1.9Ni0.1As2 Single Crystals |
| TAO Qian1, SHEN Jing-Qin2, LI Lin-Jun1, LIN Xiao1, LUO Yong-Kang1, CAO Guang-Han1, XU Zhu-An1 |
| 1Department of Physics, Zhejiang University, Hangzhou 3100272Department of Physics, Zhejiang Sci-Tech University, Xiasha College Park, Hangzhou 310018 |
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| Cite this article: |
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TAO Qian, SHEN Jing-Qin, LI Lin-Jun et al 2009 Chin. Phys. Lett. 26 097401 |
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Abstract Temperature dependence of the upper critical magnetic field (Hc2) near Tc of 20K in a BaFe1.9Ni0.1As2 single crystal is determined via magneto-resistance measurements, for the out-plane (H⊥ab) and in-plane (H || ab) directions in magnetic fields of up to 8T. The upper critical fields at zero temperature estimated by the Werthamer-Helfand-Hohenberg (WHH) formula are μ0 Hc2||(0)= 137T and μ0 Hc2⊥(0) = 51T, both exceeding the weak-coupling Pauli paramagnetic limit (μ0Hp=1.84Tc). However, the WHH formula could overestimate the μ0Hc2|| (0) value. The anisotropy of upper critical fields is around 3 in the temperature range close to Tc. The result is very similar to the Co-doped 122 superconductor BaFe2-xCoxAs2, indicating that electron-doped 122 superconductors exhibit similar superconducting properties.
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| Keywords:
74.70.Dd
74.25.Op
74.62.Bf
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Received: 26 May 2009
Published: 28 August 2009
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| PACS: |
74.70.Dd
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(Ternary, quaternary, and multinary compounds)
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74.25.Op
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(Mixed states, critical fields, and surface sheaths)
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74.62.Bf
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(Effects of material synthesis, crystal structure, and chemical composition)
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