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Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 52: Superconductivity: Fe-based Superconductors – FeSe and others

TT 52.5: Talk

Wednesday, March 18, 2015, 10:30–10:45, H 2053

Evidence for a pseudogap and charge density wave in FeSe — •Sahana Roessler1, Cevriye Koz1, Ulrich Schwarz1, Ulrich K. Roessler2, Frank Steglich1, Liu Hao Tjeng1, Peter Thalmeier1, and Steffen Wirth11Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany — 2IFW Dresden, Postfach 270016, 01171 Dresden, Germany

We present scanning tunneling microscopy/spectroscopy (STM/S) and electrical transport measurements on the structurally simple Fe-based superconductor FeSe. This compound displays a structural transition at Ts = 90 K [1,2] and a superconducting transition at Tc = 8.5 K [3]. We show that there is a crossover energy scale at temperature T*≈ 70 K, below which the anisotropic scatterings of the quasiparticles dominate the transport. The magnetization measurements indicate that T* is also an energy scale of spin fluctuations. A pseudogap associated with a one-dimensional charge density wave (CDW) was observed below 35 K in the STM/S. The CDW is found to coexist with superconductivity. The pseudogap as well as the CDW observed here are reminiscent of behaviors found also in several high-Tc cuprates, strongly suggesting that the spin and charge fluctuations are intimately connected with high-temperature superconductivity.


[1] T. M. McQueen et al.,Phys. Rev. Lett. 103, 057002 (2009).

[2] C. Koz et al., Z. Anorg. Allg. Chem. 640, 1600-1606 (2014).

[3] F. C. Hsu et al., Proc. Natl. Acad. Sci. U. S. A. 105, 14262-14264 (2008).

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