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The study of non-s-wave unconventional superconductivities in stronglycorrelated-electron systems has been a central issue in condensed matterphysics for more than 30 years. In such unconventional superconductivities,d-wave Cooper pairing with antiparallel spins has been often observed invarious quasi-two-dimensional (quasi-2D) bulk systems. Interestingly, manytheories predicted that the triangular lattice causes the d-wave pairing to beunstable and may lead to more exotic pairing such as parallel spin(spin-triplet) pairing. Here we focus on a bulk organic triangular-latticesystem in which superconductivity emerges near a nonmagnetic Mott insulatingphase. We demonstrate, by using low-power nuclear magnetic resonance (NMR)measurements, that the spin susceptibility of the superconducting state retainsthe normal state value even deep in the superconducting state. This resultindicates the possibility that the material exhibits spin-tripletsuperconductivity. Our finding will bring insights also into understanding the2D materials with triangular moire superlattices that are considered also toshow unconventional superconductivities near Mott-like insulating states.

Absence of spin susceptibility decrease in a bulk organic superconductor with triangular lattice