Thermodynamic properties of ferrimagnetic spin chains in the presence of a magnetic field

Abouie, J.; Ghasemi, S. Alireza; Langari, A.

doi:10.1103/physrevb.73.014411

Cited by 11 publications

(8 citation statements)

References 30 publications

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“…molecule-based chain systems with alternately arranged magnetic units carrying quantum spins

and

of different sizes. The ability to synthesize mixed-spin-chain materials [ 9 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ] has stimulated theoretical investigations [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. The magnon dispersion relation of such chains splits into an optical and an acoustic mode because of the two differently sized quantum spins

and

per unit cell, both for antiferromagnetic coupling along the chain [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 35 ] as well as ferromagnetic coupling [ 18 , 28 , 29 , 32 , 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

Numerical Interchain Mean-Field Theory for the Specific Heat of the Bimetallic Ferromagnetically Coupled Chain Compound MnNi(NO2)4(en)2 (en = Ethylenediamine)

et al. 2022

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We present a detailed study of the field-dependent specific heat of the bimetallic ferromagnetically coupled chain compound MnNi(NO2)4(en)2, en = ethylenediamine. For this material, which in zero field orders antiferromagnetically below TN=2.45 K, small fields suppress magnetic order. Instead, in such fields, a double-peak-like structure in the temperature dependence of the specific heat is observed. We attribute this behavior to the existence of an acoustic and an optical mode in the spin-wave dispersion as a result of the existence of two different spins per unit cell. We compare our experimental data to numerical results for the specific heat obtained by exact diagonalization and Quantum Monte Carlo simulations for the alternating spin-chain model, using parameters that have been derived from the high-temperature behavior of the magnetic susceptibility. The interchain coupling is included in the numerical treatment at the mean-field level. We observe remarkable agreement between experiment and theory, including the ordering transition, using previously determined parameters. Furthermore, the observed strong effect of an applied magnetic field on the ordered state of MnNi(NO2)4(en)2 promises interesting magnetocaloric properties.

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“…molecule-based chain systems with alternately arranged magnetic units carrying quantum spins

and

per unit cell, both for antiferromagnetic coupling along the chain [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 35 ] as well as ferromagnetic coupling [ 18 , 28 , 29 , 32 , 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

Numerical Interchain Mean-Field Theory for the Specific Heat of the Bimetallic Ferromagnetically Coupled Chain Compound MnNi(NO2)4(en)2 (en = Ethylenediamine)

et al. 2022

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“…The heterogeneity in these systems causes the emergence of behaviors that are not seen in homogeneous systems. [26][27][28][29][30][31] The coexistence of different kinds of spins do not necessarily yield to magnetic ground states. Depending on the size of spins there could be three different possibilities.…”

Section: Introductionmentioning

confidence: 99%

Frustrated mixed-spin ladders: Evidence for a bond order wave phase between rung-singlet and Haldane phases

Ahmadi¹,

Abouie²,

Haghshenas³

et al. 2021

Preprint

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In frustrated spin ladders composed of antiferromagnetically coupled chains, homogeneous or inhomogeneous, the interplay of frustration and correlations causes the emergence of two phases, Haldane (H) phase and rung singlet (RS) phase, in which the transition between these two phases had been under debate. In this paper we investigate the ground state phase diagram of frustrated mixedspin-(1, 1/2) ladders, using the notions from quantum information theory such as entanglement entropy, Schmidt gap and entanglement levels degeneracies, and also defining various local and nonlocal order parameters. Employing two numerical techniques, the infinite time-evolving block decimation (iTEBD) and density matrix renormalization group (DMRG) algorithms, we obtain the ground state phase diagram of the ladder, and demonstrate that there is an intermediate phase between RS and H phases, where the ground state is disordered and the entanglement spectrum follow no particular pattern.

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“…However, in spite of many studies on uniform spin systems, the supersolidity of mixed-spin systems has not been addressed so far. Mixed-spin systems, or quantum ferrimagnets which are composed of different spins, mostly of two kinds, are a special class of spin models where their universality class is completely different from uniform spin models [62,63,64,65]. Ferrimagnets, which occur rather frequently in nature, are somehow between the antiferromagnets and the ferromagnets.…”

Section: Introductionmentioning

confidence: 99%

Spin supersolid phase in coupled alternating spin chains

Heydarinasab¹,

Abouie²

2018

Sci Rep

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We study the ground state phase diagram of a two dimensional mixed-spin system of coupled alternating spin-1 and 1/2 chains with a stripe supersolid phase. Utilizing different analytical and numerical approaches such as mean field approximation, cluster mean field theory and linear spin wave theory, we demonstrate that our system displays a rich ground state phase diagram including novel stripe supersolid, solids with different fillings and super-counterfluid phases, in addition to a stripe solid with half filling, superfluid and Mott insulating phases. In order to find a minimal mixed-spin model for stripe supersolidity, in the second part of the paper we consider two kinds of mixed-spin system of coupled alternating spin-1 and 1/2 chains with (i) anisotropic nearest neighbor interactions, (ii) anisotropic hoppings and study their ground state phase diagrams. We demonstrate that, for the systems with uniform hoppings, the repulsive intra-chains interactions are necessary for stripe supersolidity. In this case the minimal two dimensional mixed-spin model is a system of spin-1 and spin-1/2 XXZ chains, interacting via Ising Hamiltonian. In the case of anisotropic hoppings, a system of coupled Ising chains is the minimal model.

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Thermodynamic properties of ferrimagnetic spin chains in the presence of a magnetic field

Cited by 11 publications

References 30 publications

Numerical Interchain Mean-Field Theory for the Specific Heat of the Bimetallic Ferromagnetically Coupled Chain Compound MnNi(NO2)4(en)2 (en = Ethylenediamine)

Numerical Interchain Mean-Field Theory for the Specific Heat of the Bimetallic Ferromagnetically Coupled Chain Compound MnNi(NO2)4(en)2 (en = Ethylenediamine)

Frustrated mixed-spin ladders: Evidence for a bond order wave phase between rung-singlet and Haldane phases

Spin supersolid phase in coupled alternating spin chains

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