Effect of external pressure on Tc of as‐grown and thermally treated superconducting Rbx Fe2–ySe2 single crystals |
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| Authors: | M Kanagaraj A Krzton‐Maziopa G Kalai Selvan E Pomjakushina K Conder S Weyeneth R Puzniak S Arumugam |
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| Institution: | 1. Center for High Pressure Research, School of Physics, Bharathidasan University, Tiruchirappalli 620024, India;2. Laboratory for Developments and Methods, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland;3. Faculty of Chemistry, Warsaw University of Technology, 00‐664 Warsaw, Poland;4. Physik‐Institut der Universit?t Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland;5. Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02‐668 Warsaw, Poland |
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| Abstract: | We report on the effect of external pressure on the superconducting transition temperature (Tc) of as‐grown and thermally treated single crystals of superconducting iron chalcogenide Rb0.85Fe1.9Se2. The superconducting transition temperature of 27.1 K at ambient pressure for the as‐grown sample was found to increase up to 33.2 K for the sample annealed for 3 h at 215 °C in vacuum. An increase of Tc up to 28.2 K was observed for the as‐grown sample at a pressure of 0.83 GPa. For all the studied crystals, annealed in the temperature range between 215 °C and 290 °C, the external pressure seems to decrease the superconducting transition temperature and a negative pressure coefficient of Tc was observed. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |
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| Keywords: | superconductivity iron chalcogenides annealing high pressure effects magnetisation |
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