Unambiguous Experimental Verification of Linear-in-Temperature Spinon Thermal Conductivity in an Antiferromagnetic Heisenberg Chain

Pan, Bingying; Xu, Yang; Ni, Jiamin; Zhou, Shiyu; Hong, X. C.; Qiu, Xingze; Li, S. Y.

doi:10.1103/physrevlett.129.167201

Cited by 4 publications

(1 citation statement)

References 80 publications

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“…[11] In addition, the spin gap was also found in some 1D S = 1/2 antiferromagnets with special crystal and magnetic structures, such as Cu benzoate and BaCo 2 V 2 O 8 . [12][13][14] For Cu benzoate with alternating crystal axes, it shows a field-induced spin gap because a non-collinear spin arrangement can be induced by applying a magnetic field perpendicular to the spin chain, and the canted spins are stabilized by the internal effective field along the chain. [15] However, in the case of BaCo 2 V 2 O 8 , the non-collinear magnetic structure is generated by the screw chain of Co 2+ and stabilized by the interchain exchange interaction.…”

Section: Introductionmentioning

confidence: 99%

Spin gap in quasi-one-dimensional S = 3/2 antiferromagnet CoTi₂O₅

Xu 徐,

Liu 刘,

Xin 辛

et al. 2024

Chinese Phys. B

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Quasi-one-dimensional (1D) antiferromagnets are known to display intriguing phenomena especially when there is a spin gap in their spin-excitation spectrum. Here we demonstrate that a spin gap exists in the quasi-1D Heisenberg antiferromagnet CoTi2O5 with highly ordered Co2+/Ti4+ occupation, in which the Co2+ ions with S = 3/2 form a 1D spin chain along the a-axis. CoTi2O5 undergoes an antiferromagnetic transition at T N ~ 24 K and exhibits obvious anisotropic magnetic susceptibility even in the paramagnetic region. Although a gapless magnetic ground state is usually expected in a quasi-1D Heisenberg antiferromagnet with half-integer spins, by analyzing the specific heat, the thermal conductivity, and the spin-lattice relaxation rate (1/T 1) as a function of temperature, we found that a spin gap is opened in the spin-excitation spectrum of CoTi2O5 around T N , manifested by the rapid decrease of magnetic specific heat to zero, the double-peak characteristic in thermal conductivity, and the exponential decay of 1/T 1 below T N . Both the magnetic measurements and the first-principles calculations results indicate that there is spin-orbit coupling in CoTi2O5, which induces the magnetic anisotropy in CoTi2O5, and then opens the spin gap at low temperature.

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Section: Introductionmentioning

confidence: 99%

Spin gap in quasi-one-dimensional S = 3/2 antiferromagnet CoTi₂O₅

Xu 徐,

Liu 刘,

Xin 辛

et al. 2024

Chinese Phys. B

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Phonon thermal transport shaped by strong spin-phonon scattering in a Kitaev material Na2Co2TeO6

Hong,

Gillig,

Yao

et al. 2024

npj Quantum Mater.

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The report of a half-quantized thermal Hall effect and oscillatory structures in the magnetothermal conductivity in the Kitaev material α-RuCl3 have sparked a strong debate on whether it is generated by Majorana fermion edge currents, spinon Fermi surface, or whether other more conventional mechanisms are at its origin. Here, we report low temperature thermal conductivity (κ) of another candidate Kitaev material, Na2Co2TeO6. The application of a magnetic field (B) along different principal axes of the crystal reveals a strong directional-dependent B impact on κ, while no evidence for mobile quasiparticles except phonons can be concluded at any field. Instead, severely scattered phonon transport prevails across the B−T phase diagram, revealing cascades of phase transitions for all B directions. Our results thus cast doubt on recent proposals for significant itinerant magnetic excitations in Na2Co2TeO6, and emphasize the importance of discriminating true spin liquid transport properties from scattered phonons in candidate materials.

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Low-temperature transport properties of spin- 12 random Heisenberg chains

Zhao,

Zhang

2024

Phys. Rev. B

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Unambiguous Experimental Verification of Linear-in-Temperature Spinon Thermal Conductivity in an Antiferromagnetic Heisenberg Chain

Cited by 4 publications

References 80 publications

Spin gap in quasi-one-dimensional S = 3/2 antiferromagnet CoTi₂O₅

Spin gap in quasi-one-dimensional S = 3/2 antiferromagnet CoTi₂O₅

Phonon thermal transport shaped by strong spin-phonon scattering in a Kitaev material Na2Co2TeO6

Low-temperature transport properties of spin- 12 random Heisenberg chains

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Unambiguous Experimental Verification of Linear-in-Temperature Spinon Thermal Conductivity in an Antiferromagnetic Heisenberg Chain

Cited by 4 publications

References 80 publications

Spin gap in quasi-one-dimensional S = 3/2 antiferromagnet CoTi2O5

Spin gap in quasi-one-dimensional S = 3/2 antiferromagnet CoTi2O5

Phonon thermal transport shaped by strong spin-phonon scattering in a Kitaev material Na2Co2TeO6

Low-temperature transport properties of spin- 12 random Heisenberg chains

Contact Info

Product

Resources

About

Spin gap in quasi-one-dimensional S = 3/2 antiferromagnet CoTi₂O₅

Spin gap in quasi-one-dimensional S = 3/2 antiferromagnet CoTi₂O₅