6533b861fe1ef96bd12c4432
RESEARCH PRODUCT
Quasi-one-dimensional quantum spin liquid in the $\rm {Cu(C_4H_4N_2)(NO_3)_2}$ insulator
E. V. KirichenkoKonstantin G. PopovVladimir A. StephanovichVasily R. ShaginyanVasily R. Shaginyansubject
Quantum phase transitionPhysicsCondensed Matter::Quantum GasesPhysics and Astronomy (miscellaneous)Condensed matter physicsStrongly Correlated Electrons (cond-mat.str-el)FOS: Physical sciences01 natural sciencesSpinon010305 fluids & plasmasMagnetic fieldCondensed Matter - Strongly Correlated ElectronsMagnetizationEffective mass (solid-state physics)Quantum critical point0103 physical sciencesCondensed Matter::Strongly Correlated ElectronsQuantum spin liquid010306 general physicsPhase diagramdescription
We analyze measurements of the magnetization, differential susceptibility and specific heat of quasi-one dimensional insulator Cu(C$_4$H$_4$N$_2$)(NO$_3$)$_2$ (CuPzN) subjected to magnetic fields. We show that the thermodynamic properties are defined by quantum spin liquid formed with spinons, with the magnetic field tuning the insulator CuPzN towards quantum critical point related to fermion condensation quantum phase transition (FCQPT) at which the spinon effective mass diverges kinematically. We show that the FCQPT concept permits to reveal and explain the scaling behavior of thermodynamic characteristics. For the first time, we construct the schematic $T-H$ (temperature---magnetic field) phase diagram of CuPzN, that contains Landau-Fermi-liquid, crossover and non-Fermi liquid parts, thus resembling that of heavy-fermion compounds.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-10-26 |