Large magnetic heat transport in a Haldane chain material Ni(C3H10N2)2NO2ClO4

Sun, Xiaofeng; Liu, X. G.; Chen, L. M.; Zhao, Zhuan; Zhao, Xinguo

doi:10.1063/1.4796180

Cited by 3 publications

(1 citation statement)

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“…Intriguing heat conductivity results for one-dimensional spin systems with relatively small exchange interactions have been obtained for both organic and inorganic materials, see e.g. [32,[172][173][174][175] for S = 1/2 systems and [28,30,55,[176][177][178][179] for systems with large spin, see also the reviews [180,181].…”

Section: Resultsmentioning

confidence: 95%

Heat transport of cuprate-based low-dimensional quantum magnets with strong exchange coupling

Heß

2019

Physics Reports

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Transport properties provide important access to a solid's quasiparticles, such as quasiparticle density, mobility, and scattering. The transport of heat can be particularly revealing because, in principle, all types of excitations in a solid may contribute. Heat transport is well understood for phonons and electrons, but relatively little is known about heat transported by magnetic excitations. However, during the last about two decades, the magnetic heat transport attracted increasing attention after the discovery of large and unusual signatures of it in low-dimensional quantum magnetic cuprate materials. Today it constitutes an important probe to otherwise often elusive, topological quasiparticles in a broader class of quantum magnets. This review summarizes the experimental foundation of this research, i.e. the state of the art for the magnetic heat transport in the mentioned cuprate materials which host prototypical low-dimensional antiferromagnetic S = 1/2 Heisenberg models. These comprise, in particular, the two-dimensional square lattice, and one-dimensional spin chain and two-leg ladder spin models. It is shown, how studying the heat transport provides direct access to the thermal occupation and the scattering of the already quite exotic quasiparticles of these models which range from spin-1 spin wave and triplon excitations to fractionalized spin-1/2 spinons. Remarkable transport properties of these quasiparticles have been revealed: the spin-heat transport often is highly efficient and in some cases even ballistic, in agreement with theoretical predictions. We are considering S = 1/2 models with Heisenberg interactionwhere the sum runs over all nearest neighbors in the system. Here we are investigating three different spin models: the 2D-HAF, the two-leg spin ladder, and spin chains. For the 2D-HAF and the spin chain J i,j = J and for the spin ladder J i,j = J along the legs and J i,j = J ⊥ along the rungs of the ladder. The corresponding low-dimensional quantum spin models are characterized by very peculiar ground states which are quantum disordered in the one-dimensional chain and ladder models. The elementary excitations which emerge from this ground states bear therefore a quite exotic character. For instance, the spin-spin correlations of S = 1/2 Heisenberg spin chains, decay algebraically with distance between the spins [65]. The elementary excitations are nevertheless well defined. They are fractionalized, i.e. ∆S = 1 spin-flip excitations of the system decay into so-called spinons which are gapless and carry a spin S = 1/2 [66]. On the other hand, the ground state of a two-leg ladder possesses more short-range spin-spin correlations which decay exponentially as a function of distance [67,68]. The elementary excitations are S = 1 particles (usually called magnons or triplons) and are separated from the ground state by a spin gap ∆ (∆/k B ≈ 400 K in the case of the systems discussed here) [68]. Finally, the ground state of the 2D-HAF is a rather classical longrange ordered Néel state. However, al...

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Section: Resultsmentioning

confidence: 95%

Heat transport of cuprate-based low-dimensional quantum magnets with strong exchange coupling

Heß

2019

Physics Reports

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Low-temperature heat transport of spin-gapped quantum magnets

Zhao

Liu

et al. 2016

Sci. China Phys. Mech. Astron.

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This article reviews low-temperature heat transport studies of spin-gapped quantum magnets in the last few decades. Quantum magnets with small spins and low dimensionality exhibit a variety of novel phenomena. Among them, some systems are characteristic of having quantum-mechanism spin gap in their magnetic excitation spectra, including spin-Peierls systems, S = 1 Haldane chains, S = 1/2 spin ladders, and spin dimmers. In some particular spin-gapped systems, the XY-type antiferromagnetic state induced by magnetic field that closes the spin gap can be described as a magnon Bose-Einstein condensation (BEC). Heat transport is effective in probing the magnetic excitations and magnetic phase transitions, and has been extensively studied for the spin-gapped systems. A large and ballistic spin thermal conductivity was observed in the two-leg Heisenberg S = 1/2 ladder compounds. The characteristic of magnetic thermal transport of the Haldane chain systems is quite controversial on both the theoretical and experimental results. For the spin-Peierls system, the spin excitations can also act as heat carriers. In spin-dimer compounds, the magnetic excitations mainly play a role of scattering phonons. The magnetic excitations in the magnon BEC systems displayed dual roles, carrying heat or scattering phonons, in different materials.

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Crystal Structure, Physical Properties, and Electronic and Magnetic Structure of the Spin S = ⁵/₂ Zigzag Chain Compound Bi₂Fe(SeO₃)₂OCl₃

et al. 2014

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We report the synthesis and characterization of the new bismuth iron selenite oxochloride Bi2Fe(SeO3)2OCl3. The main feature of its crystal structure is the presence of a reasonably isolated set of spin S = 5/2 zigzag chains of corner-sharing FeO6 octahedra decorated with BiO4Cl3, BiO3Cl3, and SeO3 groups. When the temperature is lowered, the magnetization passes through a broad maximum at Tmax ≈ 130 K, which indicates the formation of a magnetic short-range correlation regime. The same behavior is demonstrated by the integral electron spin resonance intensity. The absorption is characterized by the isotropic effective factor g ≈ 2 typical for high-spin Fe(3+) ions. The broadening of ESR absorption lines at low temperatures with the critical exponent β = 7/4 is consistent with the divergence of the temperature-dependent correlation length expected for the quasi-one-dimensional antiferromagnetic spin chain upon approaching the long-range ordering transition from above. At TN = 13 K, Bi2Fe(SeO3)2OCl3 exhibits a transition into an antiferromagnetically ordered state, evidenced in the magnetization, specific heat, and Mössbauer spectra. At T < TN, the (57)Fe Mössbauer spectra reveal a low saturated value of the hyperfine field Hhf ≈ 44 T, which indicates a quantum spin reduction of spin-only magnetic moment ΔS/S ≈ 20%. The determination of exchange interaction parameters using first-principles calculations validates the quasi-one-dimensional nature of magnetism in this compound.

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Large magnetic heat transport in a Haldane chain material Ni(C3H10N2)2NO2ClO4

Cited by 3 publications

References 32 publications

Heat transport of cuprate-based low-dimensional quantum magnets with strong exchange coupling

Heat transport of cuprate-based low-dimensional quantum magnets with strong exchange coupling

Low-temperature heat transport of spin-gapped quantum magnets

Crystal Structure, Physical Properties, and Electronic and Magnetic Structure of the Spin S = ⁵/₂ Zigzag Chain Compound Bi₂Fe(SeO₃)₂OCl₃

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Large magnetic heat transport in a Haldane chain material Ni(C3H10N2)2NO2ClO4

Cited by 3 publications

References 32 publications

Heat transport of cuprate-based low-dimensional quantum magnets with strong exchange coupling

Heat transport of cuprate-based low-dimensional quantum magnets with strong exchange coupling

Low-temperature heat transport of spin-gapped quantum magnets

Crystal Structure, Physical Properties, and Electronic and Magnetic Structure of the Spin S = 5/2 Zigzag Chain Compound Bi2Fe(SeO3)2OCl3

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Crystal Structure, Physical Properties, and Electronic and Magnetic Structure of the Spin S = ⁵/₂ Zigzag Chain Compound Bi₂Fe(SeO₃)₂OCl₃