Effect of pressure on the superconducting and spin-density-wave states of SmFeAsO1−xFx

B. Lorenz; K. Sasmal; R. P. Chaudhury; X. H. Chen; R. H. Liu; T. Wu; C. W. Chu

doi:10.1103/PhysRevB.78.012505

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Effect of pressure on the superconducting and spin-density-wave states of SmFeAsO1−xFx

B. Lorenz, K. Sasmal, R. P. Chaudhury, X. H. Chen, R. H. Liu, T. Wu, C. W. Chu

DOI 10.1103/PhysRevB.78.012505 · Physical Review B

T1

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Abstract

High-temperature superconductors with a Tc above 40 K have been found to be strongly correlated electron systems and to have a layered structure. Guided by these rules, Kamihara et al. [J. Am. Chem. Soc. 130, 3296 (2008)] discovered a Tc up to 26 K in the layered La(O1−xFx)FeAs. By replacing La with trivalence rare-earth (RE) elements of smaller ionic radii, Tc has subsequently been raised to 41–52 K. Many theoretical models have been proposed that emphasize the important magnetic origin of superconductivity in this compound system and a possible further Tc enhancement in RE(O1−xFx)FeAs by compression. This later prediction appears to be supported by the pressure-induced Tc increase in La(O0.89F0.11)FeAs observed. Here we show that, in contrast to previous expectations, pressure can either suppress or enhance Tc, depending on the doping level, suggesting that a Tc exceeding 50 K may be found only in the yet-to-be discovered compound systems related to but different from RE(O1−xFx)FeAs and that the Tc of La(O1−xFx)FeAs and Sm(O1−xFx)FeAs may be further raised to about 50 K.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La(O1-xFx)FeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	26	Pressure not reported	unknown
LaOFeP Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4	Pressure not reported	unknown
LaONiP Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3	Pressure not reported	unknown
Sm(O1-xFx)FeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	43	Pressure not reported	unknown
Ce(O1-xFx)FeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	41	Pressure not reported	unknown
Pr(O1-xFx)FeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	52	Pressure not reported	unknown
Nd(O1-xFx)FeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	50	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	93	Pressure not reported	unknown
Sm(O0.7F0.3)FeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	48	Pressure unresolved	onset
Sm(O0.87F0.13)FeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure unresolved	onset
Sm(O0.87F0.13)FeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	24.7	Pressure unresolved	midpoint
Sm(O0.87F0.13)FeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	25.55	0.94 GPa	midpoint