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Cassel, D.; Heß, Christian; Buechner, B.; Huecker, M.; Gross, Rudolf; Friedt, O.; Cheong, Sang‐Wook

doi:10.1023/a:1022582508916

Cited by 4 publications

(4 citation statements)

References 9 publications

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“…22,23 The negligible magnetic heat conduction in the Ti oxyhalides implies that the unusual temperature dependence and also the slight anisotropy should be rationalized in terms of pure phonon heat conduction, which has been proven to be a sensitive probe to peculiarities of the lattice such as superstructures and disorder. 40,41,47,48 The considerable jump in at T c1 clearly indicates that the phonon heat conduction in the intermediate phase is strongly suppressed with respect to that of the commensurate dimerized phase at T Ͻ T c1 where ordinary phonon heat conduction is observed. This reflects the abrupt transition toward a lattice with strongly disturbed periodicity and anharmonicity, which causes enhanced phonon scattering and is entirely consistent with the incommensurate lattice distortion in this regime.…”

Section: Discussionmentioning

confidence: 99%

Heat conductivity of the spin-Peierls compounds TiOCl and TiOBr

et al. 2010

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Heat conductivity of the spin-Peierls compounds TiOCl and TiOBr Hlubek, N.; Sing, M.; Glawion, S.; Claessen, R.; van Smaalen, S.; van Loosdrecht, P. H. M.; Buechner, B.; Hess, C.; Büchner, B. We report experimental results on the heat conductivity of the S =1/ 2 spin chain compounds TiOBr and TiOCl for temperatures 5 K Ͻ T Ͻ 300 K and magnetic fields up to 14 T. Surprisingly, we find no evidence of a significant magnetic contribution to , which is in stark contrast to recent results on S =1/ 2 spin chain cuprates. Despite this unexpected result, the thus predominantly phononic heat conductivity of these spinPeierls compounds exhibits a very unusual behavior. In particular, we observe strong anomalies at the phase transitions T c1 and T c2 . Moreover, we find an overall but anisotropic suppression of in the intermediate phase which extends even to temperatures higher than T c2 . An external magnetic field causes a slight downshift of the transition at T c1 and enhances the suppression of up to T c2 . We interpret our findings in terms of strong spin-phonon coupling and phonon scattering arising from spin-driven lattice distortions.

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Section: Discussionmentioning

confidence: 99%

Heat conductivity of the spin-Peierls compounds TiOCl and TiOBr

et al. 2010

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“…Since the major doping dependencies of the low-T peak can be explained based on these mechanisms without any problems, there is no compelling reason to incorporate a stripe induced scattering channel in the data interpretation. It is unlikely though that stripes in doped La 2 CuO 4 have no effect at all on κ ph because the aforementioned stripe-induced phonon scattering in the nickelates 24,25 is an unambiguous physical fact. However, it appears extremely difficult to prove the existence and to study the strength of purely stripe induced scattering in doped La 2 CuO 4 via κ ph .…”

Section: Stripes As a Scattering Mechanism For Phonons?mentioning

confidence: 99%

“…21,22,23 There is clear-cut evidence that in isostructural stripe ordering La 2−x Sr x NiO 4 the phonon thermal conductivity κ ph is closely correlated with both the dynamics and the periodicity of stripes: While κ ph is almost unaffected in the presence of static and long range ordered stripes, it is strongly suppressed as soon as the stripes become disordered or dynamic. 24,25,26 Apparently, in these compounds the thermal conductivity is indeed a probe for stripe correlations. One might question, however, whether this is true also in the cuprates for two reasons: First, the electron-phonon coupling in the nickelates is much stronger than in the cuprates.…”

Section: Introductionmentioning

confidence: 99%

Phonon thermal conductivity in dopedLa2CuO4:Relevant scattering mechanisms

et al. 2003

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Results of in-plane and out-of-plane thermal conductivity measurements on La1.8−xEu0.2SrxCuO4 (0 ≤ x ≤ 0.2) single crystals are presented. The most characteristic features of the temperature dependence are a pronounced phonon peak at low temperatures and a steplike anomaly at TLT , i.e., at the transition to the low temperature tetragonal phase (LTT-phase), which gradually decrease with increasing Sr-content. Comparison of these findings with the thermal conductivity of La2−xSrxCuO4 and La2NiO4 clearly reveals that in La2−xSrxCuO4 the most effective mechanism for phonon scattering is impurity-scattering (dopants), as well as scattering by soft phonons that are associated with the lattice instability in the low temperature orthorhombic phase (LTO-phase).There is no evidence that stripe correlations play a major role in suppressing the phonon peak in the thermal conductivity of La2−xSrxCuO4.

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“…the segregation of charge carriers and spins in a stripe-like pattern, was found. While static and longrange stripe correlations do not significantly affect k ph ; it is strongly suppressed if the stripes become disordered or dynamic [1,2]. A similar interrelation was discussed to be relevant for the thermal transport in the cuprate superconductors La 2Àx Sr x CuO 4 ; where the suppression of superconductivity in favour of static stripe order upon rare earth doping is accompanied by an enhancement of k ph [3,4].…”

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confidence: 94%