A calorimetric investigation of RbFe sub(2)As sub(2) single crystals
We present properties of single crystals of the iron pnictide superconductor RbFe sub(2)As sub(2) grown using a self-flux method. A bulk superconducting transition at [Formulaomitted] [Formulaomitted]2.6K was consistently observed in resistivity, magnetic susceptibility, and specific heat measuremen...
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| Veröffentlicht in: | Physica Status Solidi. B: Basic Solid State Physics 2017-01, Vol.254 (1), p.np-np |
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| container_title | Physica Status Solidi. B: Basic Solid State Physics |
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| creator | Khim, Seunghyun Aswartham, Saicharan Grinenko, Vadim Efremov, Dmitry Blum, Christian GF Steckel, Frank Gruner, Daniel Wolter, Anja UB Drechsler, Stefan-Ludwig Hes, Christian Wurmehl, Sabine Buechner, Bernd |
| description | We present properties of single crystals of the iron pnictide superconductor RbFe sub(2)As sub(2) grown using a self-flux method. A bulk superconducting transition at [Formulaomitted] [Formulaomitted]2.6K was consistently observed in resistivity, magnetic susceptibility, and specific heat measurements. While the resistivity behaves like a conventional metal at low T, the magnetic susceptibility shows an unusual broad maximum around 80K in the normal state. A large Sommerfeld coefficient, [Formulaomitted], was observed seemingly a common feature of heavily hole-doped "122" compounds. In the superconducting state, we analyzed our specific heat data based on the s- and d-wave two-gap models. The presence of the small gap with 2[Formulaomitted]/[Formulaomitted] was discussed to account for the large specific heat contribution remaining to low T far below [Formulaomitted]. The large [Formulaomitted] anisotropy ratio, [Formulaomitted] = [Formulaomitted]/[Formulaomitted] [Formulaomitted] 7 near [Formulaomitted] indicates that the large gap would occupy a highly two-dimensional Fermi surface. |
| doi_str_mv | 10.1002/pssb.201600208 |
| format | Article |
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A bulk superconducting transition at [Formulaomitted] [Formulaomitted]2.6K was consistently observed in resistivity, magnetic susceptibility, and specific heat measurements. While the resistivity behaves like a conventional metal at low T, the magnetic susceptibility shows an unusual broad maximum around 80K in the normal state. A large Sommerfeld coefficient, [Formulaomitted], was observed seemingly a common feature of heavily hole-doped "122" compounds. In the superconducting state, we analyzed our specific heat data based on the s- and d-wave two-gap models. The presence of the small gap with 2[Formulaomitted]/[Formulaomitted] was discussed to account for the large specific heat contribution remaining to low T far below [Formulaomitted]. 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A bulk superconducting transition at [Formulaomitted] [Formulaomitted]2.6K was consistently observed in resistivity, magnetic susceptibility, and specific heat measurements. While the resistivity behaves like a conventional metal at low T, the magnetic susceptibility shows an unusual broad maximum around 80K in the normal state. A large Sommerfeld coefficient, [Formulaomitted], was observed seemingly a common feature of heavily hole-doped "122" compounds. In the superconducting state, we analyzed our specific heat data based on the s- and d-wave two-gap models. The presence of the small gap with 2[Formulaomitted]/[Formulaomitted] was discussed to account for the large specific heat contribution remaining to low T far below [Formulaomitted]. The large [Formulaomitted] anisotropy ratio, [Formulaomitted] = [Formulaomitted]/[Formulaomitted] [Formulaomitted] 7 near [Formulaomitted] indicates that the large gap would occupy a highly two-dimensional Fermi surface.</abstract><doi>10.1002/pssb.201600208</doi></addata></record> |
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| language | eng |
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| source | Wiley Online Library Journals Frontfile Complete |
| subjects | Electrical resistivity Iron Magnetic permeability Magnetic susceptibility Single crystals Solid state physics Specific heat Superconductivity |
| title | A calorimetric investigation of RbFe sub(2)As sub(2) single crystals |
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