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The family of superconducting fullerides (NH_3)_xNaK_2C_60 shows an anomalouscorrelation between T_c and lattice parameter. To better understand the originof this anomaly we have studied a representative x=0.75 compound using SQUIDmagnetometry and MuSR spectroscopy. The lower critical field H_c1, measured bythe trapped magnetization method, is less than 1 G, a very small value ascompared with that of other fullerides. Muon spin depolarization in thesuperconducting phase shows also quite small local field inhomogeneities, ofthe order of those arising from nuclear dipolar fields. On the other hand, the40 T value for H_c2, as extracted from magnetometry data, is comparable to thatof other fullerides. We show that these observations cannot be rationalizedwithin the framework of the Ginzburg-Landau theory of superconductivity.Instead, the anomalous magnetic properties could be interpreted taking intoaccount the role played by polaronic instabilities in this material.

physical review. b, condensed matter

Muon spin rotation and SQUID investigation of superconductivity in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">NH</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">NaK</mml:mi></mml:…

Muon spin rotation and SQUID investigation of superconductivity in(NH3)xNaK