Formation of single-phase disordered Cs&lt;sub&gt;&lt;em&gt;x&lt;/em&gt;&lt;/sub&gt;Fe&lt;sub&gt;2-&lt;em&gt;y&lt;/em&gt;&lt;/sub&gt;Se&lt;sub&gt;2&lt;/sub&gt; at high pressure

Svitlyk, V.; Pomjakushina, E.; Krzton-Maziopa, A.; Conder, K.; Mezouar, M.

doi:10.1103/PhysRevB.97.214512

Formation of single-phase disordered Cs_xFe_2-ySe₂ at high pressure

Svitlyk V, Pomjakushina E, Krzton-Maziopa A, Conder K & Mezouar M

Citation

Svitlyk, V., Pomjakushina, E., Krzton-Maziopa, A., Conder, K., & Mezouar, M. (2018). Formation of single-phase disordered Cs_xFe_2-ySe₂ at high pressure. Physical Review B, 97(21), 214512 (6 pp.). https://doi.org/10.1103/PhysRevB.97.214512

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:5571

A single-phase high-pressure (HP) modification of Cs_xFe_2-ySe₂ was synthesized at 11.8 GPa at ambient temperature. Structurally this polymorph is similar to the minor low-pressure (LP) superconducting phase; namely, they both crystallize in a ThCr₂Si₂-type structure without ordering of the Fe vacancies within the Fe-deficient FeSe₄ layers. The HP Cs_xFe_2-ySe₂ polymorph is found to be less crystalline and nearly twice as soft compared to the parent major and minor phases of Cs_xFe_2-ySe₂. It can be quenched to low pressures and is stable at least on the scale of weeks. At ambient pressure the HP polymorph of Cs_xFe_2-ySe₂ is expected to exhibit different superconducting properties compared to its LP minor phase (T_c = 27 K).