Inter-chain Interactions, Multi-magnon condensation and Strain effect in chain compound NaVOPO${}_4$

Abstract

Employing first-principles modelling and many-body methods, the magnetic properties of spin-1/2 chain compound NaVOPO${}_4$ are explored. The extensive first-principles calculations establish an intricate three-dimensionally coupled model that consists of weakly alternating $J$-$J^{\prime }$ antiferromagnetic chains running along cris-cross directions between two consecutive $ab$ planes, connected via two subleading couplings, a ferromagnetic exchange along the $c$ direction ($J_c$) and a weaker antiferromagnetic exchange ($J_a$) along the body diagonal direction. The exact diagonalization and density matrix renormalized group study has been carried out on a two-dimensional spin model with $J$-$J^{\prime }$-$J_c$ and effective $J_d$ couplings, constructed based on the full model, for numerical ease. The $J_c$-$J_d$ phase diagram is found to host a {\it disorder} phase with a finite spin gap for comparable values of $J_c$ and $J_d$, arising out of the competing nature of these two interactions, other than two ordered phases. The calculated thermodynamic properties of this model provide a fair description of experimentally measured data. The predominant manifestation of $J_c$ and $J_d$ in the disorder phase happens in the stabilisation of a multi-magnon condensed phase, upon gap closing by application of an external magnetic field. We further explore the effect of tensile uniaxial strain, which is found to drive the system from gapful to gapless ground state.

References in corpus (30)

• The density-matrix renormalization group
• Bose-Einstein Condensation in Magnetic Insulators
• Realization of Bose-Einstein condensation of dilute magnons in TlCuCl${}_3$
• Muffin Tin Orbitals of Arbitrary Order
• Quantum magnetism and criticality
• Quantum Criticality: competing ground states in low dimensions
• Nematic order in square lattice frustrated ferromagnets
• Vector chiral and multipolar orders in the spin-1/2 frustrated ferromagnetic chain in magnetic field
• Emergent multipolar spin correlations in a fluctuating spiral - The frustrated ferromagnetic S=1/2 Heisenberg chain in a magnetic field
• Critical Properties of gapped spin-1/2 chains and ladders in a magnetic field
• Magnetic Excitations in the S=1/2 Alternating Chain Compound (VO)_2P_2O_7
• Controlling Luttinger liquid physics in spin ladders under a magnetic field
• Electronic Structure, Phonons and Dielectric Anomaly in Ferromagnetic Insulating Double Perovskite La2NiMnO6
• Multi-magnon bound states in the frustrated ferromagnetic 1D chain
• Field-induced Tomonaga-Luttinger liquid phase of a two-leg spin-1/2 ladder with strong leg interactions
• Field-Controlled Magnetic Order in the Quantum Spin-Ladder System (Hpip)2CuBr4
• Field-induced Bose-Einstein Condensation of triplons up to 8 K in Sr3Cr2O8
• Magnetic field induced quantum spin liquid in the two coupled trillium lattices of K${}_2$Ni${}_2$(SO${}_4$)${}_3$
• Quantum-critical spin dynamics in quasi-one-dimensional antiferromagnets
• Electronic Structure and Exchange Interactions of Na${}_2$V${}_3$O${}_7$
• Frustrated couplings between alternating spin-1/2 chains in AgVOAsO4
• Modified DMRG algorithm for the zigzag spin-1/2 chain with frustrated antiferromagnetic exchange: Comparison with field theory at large $J_2/J_1$
• DMRG study of scaling exponents in spin-1/2 Heisenberg chains with dimerization and frustration
• Luttinger-Liquid Behavior in the Alternating Spin-Chain System Copper Nitrate
• Multipolar phase in frustrated spin-1/2 and 1 chains
• Bose-Einstein condensation of triplons close to the quantum critical point in the quasi-one-dimensional spin-$1/2$ antiferromagnet NaVOPO${}_4$
• Field-induced double dome and Bose-Einstein condensation in the crossing quantum spin chain system AgVOAsO4
• Singlet ground state in the alternating spin-$1/2$ chain compound NaVOAsO${}_4$
• Magnon-magnon interactions in the Spin-Peierls compound CuGeO_3
• Quasi-1d quantum helimagnets: The fate of multipolar phases