Thermal conductivity due to magnons in high-quality single crystals of the two-leg spin-ladder system (Ca,Sr,La)14Cu24O41

Naruse, Keitaro; Ohno, Masumi; Matsuoka, Yoshiki; Kumagai, K.; Koike, Yasuhiro

doi:10.1016/j.ssc.2012.10.013

Cited by 18 publications

(18 citation statements)

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“…10. This finding is also in reasonable agreement with more recent steady-state studies by Naruse et al [153].…”

Section: Time-dependent Measurementssupporting

confidence: 94%

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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“…10. This finding is also in reasonable agreement with more recent steady-state studies by Naruse et al [153].…”

Section: Time-dependent Measurementssupporting

confidence: 94%

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

Heß

2019

Physics Reports

View full text Add to dashboard Cite

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“…. For the unpolished one, on the other hand, no peaks from the SrCuO 2 are observed, but peaks owing to Sr 14 Cu 24 O 41 , one of the spin‐ladder materials having the spinon thermal conductivity, appear clearly. A peak position at 2θ = 36° almost equals to that of the strongest peak in the Cu 2 O, which corresponds to the plane orientation of (111).…”

Section: Resultsmentioning

confidence: 97%

“…The value of the spinon thermal conductivity along the chains reaches ~50 W·K −1 ·m −1 even at room temperature, which is 10 times greater than that across the chains, being dominated by the phonons . Besides the SrCuO 2 , spinon thermal conductivity in Sr 2 CuO 3 and (Sr, Ca, La) 14 Cu 24 O 41 , which have quasi‐one‐dimensional spin arrangements, i.e., spin‐chain and spin‐ladder compounds, respectively, have been reported …”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, it seems that research on the spinon thermal conductivity materials has been limited to that on theoretical perspectives and investigation of physical properties using large single crystals of high purity, which are usually synthesized by a traveling solvent floating zone method . On the other hand, we have proposed synthesis of the thermal conductivity materials by glass‐ceramics technique, i.e., a heating process for melt‐quenched materials having disordered or inhomogeneous structure .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Syntheses of Spinon Thermal Conductivity Materials inSr–Cu–OSystem by Glass‐Ceramics Technique

et al. 2016

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We have synthesized spinon thermal conductivity materials in Sr-Cu-O system by glass-ceramics technique. The materials are promising for active control of thermal energy in microelectronic devices because of high and anisotropic thermal conduction, its controllability, and electric insulation. Nevertheless, research on these materials has been limited to that concerning theoretical perspectives and investigation of physical properties using large single crystals. In this study, we adopt glassceramics technique to synthesize these materials: We prepared melt-quenched multicomponent oxides including SrO and CuO, and checked its glass-forming ability and crystallization behaviors by heating. As a result, we have found that SrCuO 2 and Sr 14 Cu 24 O 41 , known as the spinon thermal conductivity materials, are synthesized using SrO-CuO--Li 2 O--Al 2 O 3 --Ga 2 O 3 system. This synthesis process for the system will provide practical application of the spinon thermal conductivity materials.

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“…The typical two-leg S = 1/2 spin-ladder material, (Sr,Ca,La) 14 Cu 24 O 41 , has been found to display a ballistic spin-mediated transport [43][44][45][46][47][48]. (Sr,Ca,La) 14 Cu 24 O 41 is often called telephone-number compound because of the six digits in the chemical formula.…”

Section: Heat Transport In S = 1/2 Spin Laddermentioning

confidence: 99%

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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Thermal conductivity due to magnons in high-quality single crystals of the two-leg spin-ladder system (Ca,Sr,La)14Cu24O41

Cited by 18 publications

References 18 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

Syntheses of Spinon Thermal Conductivity Materials inSr–Cu–OSystem by Glass‐Ceramics Technique

Low-temperature heat transport of spin-gapped quantum magnets

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