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arXiv · 1512.05254

Scanning Tunneling Spectroscopy on SrFe$\mathrm{_2}$(As$\mathrm{_{1-x}}$P$\mathrm{_x}$)$\mathrm{_2}$

Jasmin Jandke·Petra Wild·Michael Schackert·Shigemasa Suga·Tatsuya Kobayashi·Shigeki Miyasaka·Setsuko Tajima·Wulf Wulfhekel
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Abstract

We investigated SrFe$\mathrm{_2}$(As$\mathrm{_{1-x}}$P$\mathrm{_x}$)$\mathrm{_2}$ single crystals with four different phosphorus concentrations x in the superconducting phase (x = 0.35, 0.46) and in the magnetic phase (x = 0, 0.2). The superconducting samples display a V-shaped superconducting gap, which suggests nodal superconductivity. Furthermore we determined the superconducting coherence length by measuring the spatially resolved superconducting density of states (DOS). Using inelastic tunneling spectroscopy we investigated excitations in the samples with four different phosphorus concentrations. Inelastic peaks are related to bosonic modes. Phonon and non-phonon mechanism for the origin of these peaks are discussed.

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Jasmin Jandke, Petra Wild, Michael Schackert, Shigemasa Suga, Tatsuya Kobayashi, Shigeki Miyasaka, Setsuko Tajima, Wulf Wulfhekel. 2015-12-16. Scanning Tunneling Spectroscopy on SrFe$\mathrm{_2}$(As$\mathrm{_{1-x}}$P$\mathrm{_x}$)$\mathrm{_2}$. https://doi.org/10.1103/physrevb.93.104528

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