Fragmented Electronic Spins with Quantum Fluctuations in Organic Mott Insulators near Quantum Spin Liquid

Abstract

Magnetic structures of organic Mott insulators X[Pd(dmit)2]2 (X=Me4P, Me4Sb), of which electronic states are located near quantum spin liquid (X=EtMe3Sb), are demonstrated by 13C NMR. Antiferromagnetic spectra and nuclear relaxations show two distinct magnetic moments within each Pd(dmit)2 molecule, which cannot be described by single band dimer-Mott model and requires intramolecular electronic correlation. This unconventional fragmentation of S = 1/2 electron spin with strong quantum fluctuation is presumably caused by nearly degenerated intramolecular multiple orbitals, and shares a notion of quantum liquids where electronic excitations are fractionalized and S = 1/2 spin is no longer an elementary particle.

arXiv comment6 pages, 4 figures

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Cited by in corpus (8)

• Nature of the randomness-induced quantum spin liquids in two dimensions
• Spinon Excitations in the Quasi-1D S = 1/2 Chain Cs4CuSb2Cl12
• Unconventional dual 1D-2D quantum spin liquid revealed by $ab$ $initio$ studies on organic solids family
• $Ab$ $initio$ derivation and exact-diagonalization analysis of low-energy effective Hamiltonians for ${\beta }^{\prime }$-X[Pd(dmit)${}_2$]${}_2$
• A Discrepancy in Thermal Conductivity Measurement Data of Quantum Spin Liquid $\beta$'-EtMe${}_3$Sb[Pd(dmit)${}_2$]${}_2$ (dmit = 1,3-Dithiol-2-thione-4,5-dithiolate)
• Quantum many-body solver using artificial neural networks and its applications to strongly correlated electron systems
• Computational studies on magnetism and ferroelectricity
• Quasi-one-dimensional Spin Dynamics in a Molecular Spin Liquid System