Coexistence of superconductivity and magnetism in Ca1−xNaxFe2As2: Universal suppression of the magnetic order parameter in 122 iron pnictides
Philipp Materne, Sirko Kamusella, Rajib Sarkar, Til Goltz, Johannes Spehling, Hemke Maeter, Luminita Harnagea, Sabine Wurmehl, Bernd Büchner, Hubertus Luetkens, Carsten Timm, Hans-Henning Klauss
DOI 10.1103/PhysRevB.92.134511 · Physical Review B
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Abstract
We present a detailed investigation of the magnetic and superconducting properties of Ca1−xNaxFe2As2 single crystals with x=0.00, 0.35, 0.50, and 0.67 by means of the local probe techniques Mössbauer spectroscopy and muon spin relaxation experiments. With increasing Na-substitution level, the magnetic order parameter is suppressed. For x=0.50 we find a microscopic coexistence of magnetic and superconducting phases accompanied by a reduction of the magnetic order parameter below the superconducting transition temperature Tc. A systematic comparison with other 122 pnictides reveals a square-root correlation between the reduction of the magnetic order parameter and the ratio of the transition temperatures Tc/TN, which can be understood in the framework of a Landau theory. In the optimally doped sample with Tc≈34 K, diluted magnetism is found and the temperature dependence of the penetration depth and superfluid density are obtained, proving the presence of two superconducting s-wave gaps.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ca1-xNaxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17 | Pressure not reported | onset |
| Ca1-xNaxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17 | Pressure not reported | zero_resistance |
| Ca1-xNaxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 34 | Pressure not reported | onset |
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