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The newly discovered superconductors A2Cr3As3 (A = K, Rb, Cs), with aquasi-one-dimensional crystal structure have attracted considerable interest.The crystal structure consists of double-walled tubes of [Cr3As3]^(2-) thatextend along the c-axis. Previously we reported measurements of the change inLondon penetration depth of polycrystalline samples of K2Cr3As3 using a tunneldiode oscillator based technique, which show a linear temperature dependence atlow temperatures, giving evidence for line nodes in the superconducting gap.Here we report similar measurements of the penetration depth forpolycrystalline Rb2Cr3As3 and several single crystals of K2Cr3As3, prepared bytwo different research groups. The single crystal measurements show similarbehavior to polycrystalline samples down to 0.9-1.2 K, where a downturn isobserved in the frequency shift for all single crystal samples. These resultsgive further evidence for nodal superconductivity in K2Cr3As3, which indicatesthat the superconducting pairing state is unconventional. The different lowtemperature behavior observed in samples which have deteriorated after beingexposed to air, emphasises that it is necessary to properly handle the samplesprior to being measured because the A2Cr3As3 compounds are extremely airsensitive and evidence for nodal superconductivity from penetration depthmeasurements is only observed in the samples which display a sharpsuperconducting transition. Therefore further work is required to improve thequality of single crystals and to identify the origin of the downturn.

Penetration depth measurements of K2Cr3As3 and Rb2Cr3As3