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Collapse of the Fe-vacancy order and successive phase transitions in superconducting KxFe2-ySe2 (0.7 leg x leg 0.8, 0.2 leg y leg 0.3) | | J. Q. Li
; Y. J. Song
; H. X. Yang
; Z. Wang
; H. L. Shi
; G. F. Chen
; Z.W. Wang
; Z.Chen
; H. F. Tian
; | | Date: |
28 Apr 2011 | | Abstract: | The Fe-based superconducting KxFe2-ySe2 (0.6 {leg} x {leg} 1, 0.2{leg} y
{leg} 0.4) compounds, unlike the well-known RFe2As2 (R = Ba, Sr, Ca)
superconductors, contain complex structural features and notable physical
properties, such as the Fe-vacancy ordering, multi-superconducting transitions
and the phase separation[1]. Recent experimental studies also suggested the
presence of remarkable interplay among the Fe-vacancy order and the
antiferromagnetic structure[2]. Here we demonstrate that the well-characterized
superconducting KxFe2-ySe2 (0.6 {leg} x {leg} 0.8, 0.2 {leg} x {leg} 0.3)
samples contain complex microstructure features and undergo successive phase
transitions at low temperatures. In-situ TEM observations on a number of the
KxFe2-ySe2 superconductors demonstrated the presence of a remarkable collapse
of the Fe-vacancy order above the superconducting transition, as a result, the
superconducting phase actually adopts a tetragonal structure without the
Fe-vacancy ordering. Moreover, our analysis at the low temperatures suggests
that the superconductors likely adopt a Fe-deficient structure with composition
of K0.75Fe2-ySe2. These results are important not only for the further
optimization of superconducting phase in present system but also for
understanding the mechanism of the Fe-based superconductivity. | | Source: | arXiv, 1104.5340 | | Services: | Forum | Review | PDF | Favorites | |
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