Phase diagrams of Ba(Fe1-xMx)(2)As-2 single crystals (M=Rh and Pd)

TitlePhase diagrams of Ba(Fe1-xMx)(2)As-2 single crystals (M=Rh and Pd)
Publication TypeJournal Article
Year of Publication2009
AuthorsNi N, Thaler A, Kracher A, Yan JQ, Bud'ko SL, Canfield PC
Journal TitlePhysical Review B
Date Published07/01
ISBN Number1098-0121
Accession NumberISI:000268617500090
Keywordsbarium alloys, crystal structure, doping, electrical resistivity, iron alloys, magnetic transitions, magnetisation, palladium alloys, phase diagrams, rhodium alloys, superc, superconducting materials, superconducting transition temperature, thermodynamics

Single crystalline Ba(Fe1-xMx)(2)As-2 (M=Rh,Pd) series have been grown and characterized by structural, thermodynamic, and transport measurements. These measurements show that the structural/magnetic phase transitions, found in pure BaFe2As2 at 134 K, are suppressed monotonically by the doping and that superconductivity can be stabilized over a domelike region. Temperature-composition (T-x) phase diagrams based on electrical transport and magnetization measurements are constructed and compared to those of the Ba(Fe1-xMx)(2)As-2 (M=Co,Ni) series. Despite the generic difference between 3d and 4d shells and the specific, conspicuous differences in the changes to the unit cell parameters, the effects of Rh doping are exceptionally similar to the effects of Co doping and the effects of Pd doping are exceptionally similar to the effects of Ni doping. These data show that whereas the structural/antiferromagnetic phase-transition temperatures can be parameterized by x and the superconducting transition temperature can be parameterized by some combination of x and e, the number of extra electrons associated with the M doping, the transition temperatures of 3d- and 4d-doped BaFe2As2 cannot be simply parameterized by the changes in the unit-cell dimensions or their ratios.


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