Heat capacity jump at Tc and pressure derivatives of superconducting transition temperature in the Ba1−xKxFe2As2 (0.2≤x≤1.0) series

Sergey L. Bud'ko; Mihai Sturza; Duck Young Chung; Mercouri G. Kanatzidis; Paul C. Canfield

doi:10.1103/PhysRevB.87.100509

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Heat capacity jump at Tc and pressure derivatives of superconducting transition temperature in the Ba1−xKxFe2As2 (0.2≤x≤1.0) series

Sergey L. Bud'ko, Mihai Sturza, Duck Young Chung, Mercouri G. Kanatzidis, Paul C. Canfield

DOI 10.1103/PhysRevB.87.100509 · Physical Review B

T1

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Abstract

We present the evolution of the initial (up to ∼10 kbar) hydrostatic pressure dependencies of Tc and of the ambient pressure jump in the heat capacity associated with the superconducting transition as a function of K doping in the Ba1−xKxFe2As2 family of iron-based superconductors. The pressure derivatives show a weak but distinct anomaly near x∼0.7. In the same concentration region, ΔCp|Tc deviates from the ΔCp∝T3 scaling found for most BaFe2As2-based superconductors. These results are consistent with a possible significant modification of the superconducting state, occurring near x∼0.7.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Ba0.8K0.2Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	13.6	Pressure unresolved	onset
Ba0.7K0.3Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	23	Pressure unresolved	onset
Ba0.6K0.4Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	38	Pressure unresolved	onset
Ba0.4K0.6Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	32	Pressure unresolved	onset
Ba0.3K0.7Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	22	Pressure unresolved	onset
Ba0.2K0.8Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10	Pressure unresolved	onset
Ba0.1K0.9Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7	Pressure unresolved	onset
KFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.4	Pressure unresolved	onset
Ba0.2K0.8Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10	Pressure unresolved	midpoint