Absence of spin susceptibility decrease in a bulk organic superconductor with triangular lattice
The study of non-s-wave unconventional superconductivities in strongly correlated electron systems has been a central issue in condensed matter physics for more than 30 years. In such unconventional superconductivities, d-wave Cooper pairing with antiparallel spins has been often observed in various...
Saved in:
Published in | Physical review research Vol. 4; no. 2; p. 023196 |
---|---|
Main Authors | , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
American Physical Society (APS)
01.06.2022
American Physical Society |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | The study of non-s-wave unconventional superconductivities in strongly correlated electron systems has been a central issue in condensed matter physics for more than 30 years. In such unconventional superconductivities, d-wave Cooper pairing with antiparallel spins has been often observed in various quasi-two-dimensional (quasi-2D) bulk systems. Interestingly, many theories predicted that the triangular lattice causes the d-wave pairing to be unstable and may lead to more exotic pairing such as parallel spin (spin-triplet) pairing. Here we focus on a bulk organic triangular-lattice system in which superconductivity emerges near a nonmagnetic Mott insulating phase. We demonstrate, by using low-power nuclear magnetic resonance (NMR) measurements, that the spin susceptibility of the superconducting state retains the normal state value even deep in the superconducting state. This result indicates the possibility that the material exhibits spin-triplet superconductivity. Our finding will bring insights also into understanding the 2D materials with triangular moiré superlattices that are considered also to show unconventional superconductivities near Mott-like insulating states. |
---|---|
Bibliography: | USDOE Japan Society for the Promotion of Science (JSPS) 89233218CNA000001 LA-UR-21-31854 |
ISSN: | 2643-1564 2643-1564 |
DOI: | 10.1103/PhysRevResearch.4.023196 |