Prediction of pseudogap formation due to d-wave bond-order in organic superconductor κ−(BEDT-TTF)2X
Rina Tazai, Youichi Yamakawa, Masahisa Tsuchiizu, Hiroshi Kontani
DOI 10.1103/PhysRevResearch.3.L022014 · Physical Review Research
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Abstract
Rich hidden unconventional orders with pseudogap formation, such as the intersite bond order (BO), attract increasing attention in condensed matter physics. Here, we investigate the hidden order formation in organic unconventional superconductor κ−(BEDT-TTF)2X. We predict the formation of d-wave BO at wavelength q=QB=(δ,δ) (δ=0.38π) for the first time, based on both the functional renormalization group (fRG) and the density-wave equation theories. The origin of the BO is the quantum interference among antiferromagnetic spin fluctuations. This prediction leads to distinct pseudogap-like reduction in the NMR 1/T1 relaxation rate and in the density-of-states, consistently with essential experimental reports. The present theory would be applicable for other strongly correlated metals with pseudogap formation.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(BEDT-TTF)2X Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure not reported | onset |
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