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.

6 pages, 4 figures

References in corpus (5)

• Novel Pauli-paramagnetic quantum phase in a Mott insulator
• Cation Dependence of the Electronic States in Molecular Triangular Lattice System β'-X[Pd(dmit)_2]_2: A First-principles study
• Phase Competition and Superconductivity in $\kappa$-(BEDT-TTF)${}_2$X: Importance of Intermolecular Coulomb Interactions
• Fragment Model Study of Molecular Multi-Orbital System $X$[Pd(dmit)${}_2$]${}_2$
• Algebraic Charge Dynamics of Quantum Spin Liquid b'-EtMe3Sb[Pd(dmit)2]2

Cited by in corpus (3)

• Unconventional dual 1D-2D quantum spin liquid revealed by $ab$ $initio$ studies on organic solids family
• 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)
• Computational studies on magnetism and ferroelectricity