Evolution of the Phase Diagram of LaFeP$_{1-x}$As$_{x}$O$_{1-y}$F$_{y}$ ($y$ = 0 -- 0.1)

P/As-substitution effects on the transport properties of polycrystalline LaFeP $_{1 - x}$ As $_{x}$ O $_{1 - y}$ F $_{y}$ with $x$ = 0 – 1.0 and $y$ = 0 – 0.1 have been studied. In the F-free samples ( $y$ = 0), a new superconducting (SC) dome with a maximum $T_{c}$ of 12 K is observed around $x$ = 0 – 0.3. This is separated from another SC dome with $T_{c}$ $\sim$ 10 K at $x$ = 0.6 – 0.8 by an antiferromagnetic region ( $x$ = 0.3 – 0.6), giving a two-dome feature in the $T_{c} - x$ phase diagram. As $y$ increases, the two SC domes merge together, changing to a double peak structure at $y$ = 0.05 and a single dome at $y$ = 0.1. This proves the presence of two different Fermi surface states in this system.

Evolution of the Phase Diagram of LaFeP $_{1 - x}$ As $_{x}$ O $_{1 - y}$ F $_{y}$ ( $y$ = 0 -- 0.1)

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Evolution of the Phase Diagram of LaFeP $_{1 - x}$ As $_{x}$ O $_{1 - y}$ F $_{y}$ ( $y$ = 0 -- 0.1)

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Evolution of the Phase Diagram of LaFeP1−x1−x​Asxx​O1−y1−y​Fyy​ (yy = 0 -- 0.1)

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Evolution of the Phase Diagram of LaFeP1−x1−x​Asxx​O1−y1−y​Fyy​ (yy = 0 -- 0.1)

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Evolution of the Phase Diagram of LaFeP $_{1 - x}$ As $_{x}$ O $_{1 - y}$ F $_{y}$ ( $y$ = 0 -- 0.1)

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Evolution of the Phase Diagram of LaFeP $_{1 - x}$ As $_{x}$ O $_{1 - y}$ F $_{y}$ ( $y$ = 0 -- 0.1)

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