Abstract
The existence of a high-temperature superconducting phase with Tc∼40 K in PbO-type tetragonal β-FeSe has been demonstrated by application of high pressure. We have used a rapid, solvent-less reaction under autogenic pressure at elevated temperature (RAPET) process to synthesize superconducting FeSe nanoparticles. The nanoparticles obtained are mainly the superconducting β-FeSe phase. Detailed magnetization measurements on these nanoparticles show that in addition to the superconducting transition at ∼10 K, we observe an anomaly in magnetic susceptibility measurements suggesting the presence of a superconducting transition at ∼30 K in the synthesized nanoparticles. The superconducting volume fraction depends on the chemical composition of the starting materials and also on the processing time.
Original language | English |
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Pages (from-to) | 649-652 |
Number of pages | 4 |
Journal | Solid State Communications |
Volume | 152 |
Issue number | 8 |
DOIs | |
Publication status | Published - Apr 2012 |
Externally published | Yes |
Keywords
- β-FeSe superconductor
- High pressure
- Nanoparticle
- Reaction under autogenic pressure at elevated temperature (RAPET) process
ASJC Scopus subject areas
- General Chemistry
- Condensed Matter Physics
- Materials Chemistry