Universal temperature dependence of the London penetration depth in κ − ( ET ) 2 X superconductors

High-precision radio-frequency magnetic susceptibility measurements were performed on single crystals of fully deuterated κ − ( ET )2Cu [N (CN)2] Br , hereafter designated as κ − (D 8 ET)2 Cu [N (CN)2] Br . This material phase separates into superconducting and antiferromagnetic regions, the degree...

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