Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 2: Superconductivity: Properties and Electronic Structure 1

TT 2.10: Talk

Monday, March 20, 2017, 12:15–12:30, HSZ 103

Surface reconstructions and Abrikosov lattice in the heavy electron superconductor Tl Ni₂ Se₂ — •Stefan Wilfert¹, Martin Schmitt¹, Henrik Schmidt¹, Tobias Mauerer¹, Paolo Sessi¹, Hangdong Wang², Qianhui Mao², Minghu Fang², and Matthias Bode¹ — ¹Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany — ²Department of Physics, Zhejiang University, Hangzhou 310027, China

We report on the structural and electronic properties of the heavy electron superconductor TlNi₂Se₂. By using a variable-temperature STM various surface (2 × n) reconstructions were observed which, similar to Fe-based superconductors [1], strongly depend on the temperature during cleavage and the measurement process. Additionally, we performed measurements with a low-temperature STM and found the opening of a superconducting gap. The values for critical temperature and critical magnetic field are in good agreement with earlier transport measurements [2]. In the superconducting state the formation of an Abrikosov lattice was observed without any sign of a zero bias anomaly in the vortex core.

[1] F. Massee et al., Phys. Rev. B 80, 140507(R) (2009).

[2] H. Wang et al., Phys. Rev. Lett 111, 207001 (2013).