Weak coupling of pseudoacoustic phonons and magnon dynamics in the incommensurate spin-ladder compound Sr14Cu24O41

Chen, Xi; Bansal, Dipanshu; Sullivan, Sean; Abernathy, Douglas L.; Aczel, Adam A.; Zhou, Jianshi; Delaire, Olivier A.; Shi, Li

doi:10.1103/PhysRevB.94.134309

Title: Weak coupling of pseudoacoustic phonons and magnon dynamics in the incommensurate spin-ladder compound $S r_{14} C u_{24} O_{41}$

Journal Article · Fri Oct 21 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.134309· OSTI ID:1337851

Chen, Xi ^[1]; Bansal, Dipanshu ^[2]; Sullivan, Sean ^[1]; Abernathy, Douglas L. ^[2]; Aczel, Adam A. ^[2]; Zhou, Jianshi ^[1]; Delaire, Olivier A. ^[3]; Shi, Li ^[1]

The Univ. of Texas at Austin, Austin, TX (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Duke Univ., Durham, NC (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Intriguing lattice dynamics have been predicted for aperiodic crystals that contain incommensurate substructures. Here we report inelastic neutron scattering measurements of phonon and magnon dispersions in Sr₁₄Cu₂₄O₄₁, which contains incommensurate one-dimensional (1D) chain and two-dimensional (2D) ladder substructures. Two distinct pseudoacoustic phonon modes, corresponding to the sliding motion of one sublattice against the other, are observed for atomic motions polarized along the incommensurate axis. In the long wavelength limit, it is found that the sliding mode shows a remarkably small energy gap of 1.7–1.9 meV, indicating very weak interactions between the two incommensurate sublattices. The measurements also reveal a gapped and steep linear magnon dispersion of the ladder sublattice. The high group velocity of this magnon branch and weak coupling with acoustic and pseudoacoustic phonons can explain the large magnon thermal conductivity in Sr₁₄Cu₂₄O₄₁ crystals. In addition, the magnon specific heat is determined from the measured total specific heat and phonon density of states and exhibits a Schottky anomaly due to gapped magnon modes of the spin chains. Furthermore, these findings offer new insights into the phonon and magnon dynamics and thermal transport properties of incommensurate magnetic crystals that contain low-dimensional substructures.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725; SC0016166

OSTI ID:: 1337851

Alternate ID(s):: OSTI ID: 1329503

Journal Information:: Physical Review B, Vol. 94, Issue 13; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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Effects of Ca substitution on quasiacoustic sliding modes in ${Sr}_{14 - x} {Ca}_{x} {Cu}_{24} O_{41}$ Constable, E.; Squires, A. D.; Horvat, J. Physical Review B, Vol. 100, Issue 18 https://doi.org/10.1103/physrevb.100.184305	journal	November 2019
Glass-like thermal conductivity in nanostructures of a complex anisotropic crystal Weathers, Annie; Carrete, Jesús; DeGrave, John P. Physical Review B, Vol. 96, Issue 21 https://doi.org/10.1103/physrevb.96.214202	journal	December 2017
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Title: Weak coupling of pseudoacoustic phonons and magnon dynamics in the incommensurate spin-ladder compound $S r_{14} C u_{24} O_{41}$