Artículo
Hole doping by pressure on the 1111 pnictides CaFeAsF and SrFeAsF
Freitas, Daniele C.; Garbarino, Gaston Leonel
; Weht, Ruben Oscar
; Sow, Amadou; Zhu, Xiyu; Han, Fei; Cheng, Peng; Ju, Jing; Wen, Hai Hu; Nunez Regueiro, Manuel Daniel
Fecha de publicación:
03/2014
Editorial:
IOP Publishing
Revista:
Journal of Physics: Condensed Matter
ISSN:
0953-8984
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We determine the pressure phase diagram of the 1111 compounds CaFeAsF and SrFeAsF, up to 20 GPa and down to 4 K by electrical resistivity measurements and the change of structure up to 40 GPa at room temperature. The antiferromagnetic transition temperature, as determined by the derivative peak, shows a minimum at ~5 GPa (10 GPa) for the Ca (Sr) compound. For CaFeAsF, superconductivity appears at this minimum, coincident with the development of a previously reported monoclinic phase. For SrFeAsF, where the orthorhombic and the monoclinic phase were reported to coexist, superconductivity exists above P≥1 GPa. Both phase diagrams can be scaled by a shift of ~10 GPa pressure at which the volume of SrFeAsF and that of CaFeAsF at ambient pressure coincide. The difference of our phase diagram with that of electron-doped 1111 samples is accounted for by hole doping under pressure, which we verified through electron band structure calculations.
Palabras clave:
Superconductivity
,
Electronic Properties
,
Pressure
,
Phase Diagram
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Identificadores
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Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Articulos de SEDE CENTRAL
Citación
Sow, Amadou; Wen, Hai Hu; Garbarino, Gaston Leonel; Freitas, Daniele C.; Cheng, Peng; Nunez Regueiro, Manuel Daniel; et al.; Hole doping by pressure on the 1111 pnictides CaFeAsF and SrFeAsF; IOP Publishing; Journal of Physics: Condensed Matter; 26; 15; 3-2014; 1-5; 5702
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