Journal
PHYSICAL REVIEW RESEARCH
Volume 3, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevResearch.3.013127
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Funding
- JSPS of Japan [JP19H05825]
- JSPS KAKENHI [JP18H01175, JP20K22328, JP20K03858, JP17K05543]
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Theoretical prediction of nanoscale spontaneous spin current order in cuprates, driven by odd-parity electron-hole condensations and mediated by transverse spin fluctuations. The fluctuations of sLC order work as attractive pairing interaction between adjacent hot spots, increasing the d-wave superconducting transition temperature T-c. The sLC state serves as a key ingredient in understanding the pseudogap, electronic nematicity, and superconductivity in cuprates.
Unconventional symmetry-breaking phenomena due to nontrivial order parameters attract increasing attention in strongly correlated electron systems. Here, we predict theoretically the occurrence of nanoscale spontaneous spin current, called the spin-loop-current (sLC) order, as a promising origin of the pseudogap and electronic nematicity in cuprates. We reveal that the sLC is driven by the odd-parity electron-hole condensations that are mediated by transverse spin fluctuations around the pseudogap temperature T*. At the same temperature, odd-parity magnon pair condensation occurs. The sLC order is hidden in that neither internal magnetic field nor charge-density modulation is induced, whereas the predicted sLC with finite wave-number naturally gives the Fermi arc structure. In addition, the fluctuations of sLC order work as attractive pairing interaction between adjacent hot spots, which enlarges the d-wave superconducting transition temperature T-c. The sLC state will be a key ingredient in understanding the pseudogap, electronic nematicity, as well as superconductivity in cuprates and other strongly correlated metals.
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