Structural and Magnetic Phase Diagram of La2O(3-x)F(x)Fe2Se2 and LaREO3Fe2Se2 (RE= rare earth)
The cuprate oxides appear to teach us that what we need for high-TC superconductivity is an S=1/2 antiferromagnetic Mott insulator ground state where the transition metal resides in a square planar geometry. The newly discovered iron pnictide superconductors violate this notion as the parents phase ground state is metallic and the Fe ion resides in a tetrahedrally coordinated site. Despite this differences they are many features of the pnictides that are shared with the cuprates, such as high TC values, proximity to a magnetically ordered state and a linear temperature dependence of the resistivity. Recent work has shown that the oxo-selinide compound La2O3Fe2Se2 provides for a similar local environment of the Fe-ion to that found in the Fe-superconductors but is an antiferromagnetic Mott insulator that undergoes a structural transition at TN=90K. We varied this compound by using F for O and we induced strain by using mixed rare earts. The resulting solid solution follows the expected Vegard's Law and TN decreases with doping. We propose to determine the structural and magnetic phase diagram of this new solid solution over 5 days using D1B
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LANDSGESELL Sven; Claire V. Colin; LAVERSENNE Laetitia; NASSIF Vivian and PROKES Karel. (2012). Structural and Magnetic Phase Diagram of La2O(3-x)F(x)Fe2Se2 and LaREO3Fe2Se2 (RE= rare earth). Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2202
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