First single crystal growth and structural analysis of superconducting layered bismuth oxyselenide; La(O,F)BiSe2

TL;DR

This paper reports the first successful growth and structural analysis of La(O,F)BiSe2 single crystals, revealing its layered structure and superconducting transition at 3.6 K, suggesting potential for higher Tc under pressure.

Contribution

First successful growth and structural characterization of La(O,F)BiSe2 single crystals using CsCl flux method.

Findings

La(O,F)BiSe2 crystallizes in space group P4/nmm.

Superconducting transition observed at 3.6 K.

Potential for higher Tc under high pressure.

Abstract

Single crystal of La(O,F)BiSe2 was successfully grown for the first time by the CsCl flux method. Single crystal X-ray structural analysis clearly showed that La(O,F)BiSe2 crystalizes with space group P4/nmm (lattice parameters a = 4.1408(2) {\AA}, c = 14.1096(6) {\AA}). The structure is composed of alternating BiSe2 and LaO layers. Magnetic susceptibility and resistivity measurements showed the superconducting transition at 3.6 K, which is higher than that of as-grown La(O,F)BiS2. The structural analysis implies that La(O,F)BiSe2 is potential superconductor having higher Tc under high pressure.