Anomalous Transport Properties and Phase Diagram of the FeAs-Based SmFeAsO1−xFx Superconductors

R. H. Liu; G. Wu; T. Wu; D. F. Fang; H. Chen; S. Y. Li; K. Liu; Y. L. Xie; X. F. Wang; R. L. Yang; L. Ding; C. He; D. L. Feng; X. H. Chen

doi:10.1103/PhysRevLett.101.087001

Anomalous Transport Properties and Phase Diagram of the FeAs-Based SmFeAsO1−xFx Superconductors

R. H. Liu, G. Wu, T. Wu, D. F. Fang, H. Chen, S. Y. Li, K. Liu, Y. L. Xie, X. F. Wang, R. L. Yang, L. Ding, C. He, D. L. Feng, X. H. Chen

DOI 10.1103/PhysRevLett.101.087001 · Physical Review Letters

T1

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Abstract

We report the detailed phase diagram and anomalous transport properties of Fe-based high-Tc superconductors SmFeAsO1−xFx. It is found that superconductivity emerges at x∼0.07, and optimal doping takes place in the x∼0.20 sample with the highest Tc∼54 K. Tc increases monotonically with doping; the anomaly in resistivity from structural phase or spin-density-wave order is rapidly suppressed, suggesting a quantum critical point around x∼0.14. As manifestations, a linear temperature dependence of the resistivity shows up at high temperatures in the x<0.14 regime but at low temperatures just above Tc in the x>0.14 regime; a drop in carrier density evidenced by a pronounced rise in the Hall coefficient is observed below the temperature of the anomaly peak in resistivity. A scaling behavior is observed between the Hall angle and temperature: cotθH∝T1.5 for all samples with different x in SmFeAsO1−xFx system.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
SmFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	54	Pressure not reported	onset
SmFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	17.1	Pressure not reported	unknown
SmFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	27	Pressure not reported	unknown
SmFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	41.8	Pressure not reported	unknown
SmFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	51.8	Pressure not reported	unknown
LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	26	Pressure not reported	unknown
SmFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	43	Pressure not reported	unknown
CeFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	41	Pressure not reported	unknown
PrFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	52	Pressure not reported	unknown