Contact

Medvediev, Sergiy
Sergiy Medvediev
Group leader
Phone: +49 351 4646-3203

High Pressure

Publication highlights

1.
S. Medvedev, T. M. McQueen, I. A. Troyan, T. Palasyuk, M. I. Eremets, R. J. Cava, S. Naghavi, F. Casper, V. Ksenofontov, G. Wortmann, and C. Felser, "Electronic and magnetic phase diagram of β-Fe1.01Se with superconductivity at 36.7 K under pressure," Nature Materials 8 (8), 630-633 (2009).
2.
L. M. Schoop, S. A. Medvedev, V. Ksenofontov, A. Williams, T. Palasyuk, I. A. Troyan, J. Schmitt, F. Casper, C. H. Wang, M. Eremets, R. J. Cava, and C. Felser, "Pressure-restored superconductivity in Cu-substituted FeSe," Physical Review B 84 (17), 174505 (2011).
3.
V. Ksenofontov, S. A. Medvedev, L. M. Schoop, G. Wortmann, T. Palasyuk, V. Tsurkan, J. Deisenhofer, A. Loidl, and C. Felser, "Superconductivity and magnetism in Rb0.8Fe1.6Se2 under pressure," Physical Review B 85 (21), 214519 (2012).

Superconductivity

The study of pressure effect on the properties of the superconducting materials can serve as a quantitative test of theoretical models and at the same time as a guide in the synthesis of new materials with superconducting properties: (i) dependence of the critical temperature (Tc) of superconductivity on pressure can provide the ideas for increasing of Tc for a given superconductor at ambient pressure through chemical substitution (doping); (ii) some superconducting materials can be synthesized only at the conditions of high pressure and high temperature; (iii) many nonsuperconducting at ambient conditions materials become superconducting at high (very high) pressures. Our current project is focused on high pressure study of interplay between structural, magnetic and superconducting properties of novel Fe-based superconductors. [1-3]

<p><strong>Figure 1:</strong><em> Pressure induced superconductivity (maximum T<sub>c</sub></em><em>&raquo;</em><em>6 K at </em><em>&raquo;</em><em>16 GPa) in tungsten telluride (WTe<sub>2</sub>)</em></p> Zoom Image

Figure 1: Pressure induced superconductivity (maximum Tc»6 K at »16 GPa) in tungsten telluride (WTe2)

 
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