Thermal Conductivity of the Hole-Doped Spin Ladder System<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mn>4</mml:mn><mml:mo>−</mml:mo><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Ca</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Cu</

Sologubenko, A. V.; Giannò, K.; Ott, H. R.; Ammerahl, U.; Revcolevschi, A.

doi:10.1103/physrevlett.84.2714

Cited by 198 publications

(261 citation statements)

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“…M aterials with a complex crystal structure continue to be the subject of a wide range of scientific studies and technological applications 1,2 6 , and intermetallic Nowotny chimney ladder (NCL) phases 7 with potential technological applications in optoelectronic 8 and thermoelectric 9,10 devices. A prominent example of NCL phases is higher manganese silicides (HMS), Mn n Si 2n À m , which consists of a tetragonal Mn chimney sublattice based on the b-Sn structure and a Si ladder sublattice with the atomic arrangement of coupled helices 11 .…”

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confidence: 99%

Twisting phonons in complex crystals with quasi-one-dimensional substructures

et al. 2015

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A variety of crystals contain quasi-one-dimensional substructures, which yield distinctive electronic, spintronic, optical and thermoelectric properties. There is a lack of understanding of the lattice dynamics that influences the properties of such complex crystals. Here we employ inelastic neutron scatting measurements and density functional theory calculations to show that numerous low-energy optical vibrational modes exist in higher manganese silicides, an example of such crystals. These optical modes, including unusually low-frequency twisting motions of the Si ladders inside the Mn chimneys, provide a large phase space for scattering acoustic phonons. A hybrid phonon and diffuson model is proposed to explain the low and anisotropic thermal conductivity of higher manganese silicides and to evaluate nanostructuring as an approach to further suppress the thermal conductivity and enhance the thermoelectric energy conversion efficiency. This discovery offers new insights into the structure-property relationships of a broad class of materials with quasi-one-dimensional substructures for various applications.

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confidence: 99%

Twisting phonons in complex crystals with quasi-one-dimensional substructures

et al. 2015

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“…Another interesting way to study the spin gap properties in spin ladder is to replace Sr by isovalent Ca which initiates a transfer of holes from the chains to the ladders, leading to a change of the temperature dependence of the c-axis resistivity from semiconducting to metallic [43]. The substitution does not change Δ chain , indicated by inelastic neutron scattering [51], but the ordered state of dimers in the chains becomes unstable.…”

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

confidence: 99%

“…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%

“…The most notable phenomenon is the behavior of  c at T > 50 K, where a second pronounced maximum of the  occurs at T ≈ 140 K. It is reasonable to attribute the high-T maximum of  c to magnetic excitations propagating along the spin ladders. In order to estimate the phonon background, a Debye model was used to fit the data [43,44],…”

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

confidence: 99%

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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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“…Experimentally, recent studies made possible by the synthesis of new families of compounds characterized by very weak interchain coupling and low disorder, indicate unconventional transport and dynamic behavior; for example, unusually high thermal conductivity in quasi-one dimensional magnetic compounds [1,2,3], ballistic spin transport in magnetic chains [4,5] or optical conductivity in quasi-1D organic conductors, showing a low frequency very narrow "Drude peak" even at relatively high temperatures [6,7].…”

Section: Introductionmentioning

confidence: 99%

Transport in one dimensional quantum systems

Zotos

Prelovšek

Physics and Chemistry of Materials With Low-Dimens

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In this Chapter, we present recent theoretical developments on the finite temperature transport of one dimensional electronic and magnetic quantum systems as described by a variety of prototype models. In particular, we discuss the unconventional transport and dynamic -spin, electrical, thermal -properties implied by the integrability of models as the spin-1/2 Heisenberg chain or Hubbard. Furthermore, we address the implication of these developments to experimental studies and theoretical descriptions by low energy effective theories.

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Thermal Conductivity of the Hole-Doped Spin Ladder SystemSr14−xCaxCu

Cited by 198 publications

References 24 publications

Twisting phonons in complex crystals with quasi-one-dimensional substructures

Twisting phonons in complex crystals with quasi-one-dimensional substructures

Low-temperature heat transport of spin-gapped quantum magnets

Transport in one dimensional quantum systems

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