Abstract
We have studied the thermal conductivity κ of stripe ordering La 2–x Sr x NiO 4. In particular, long range stripe order is well established for x = 1/3. For this composition κ is enhanced in the charge ordering phase and exhibits a clear maximum at low T. Even small deviations from this stochiometry cause a strong change of κ: the low T-maximum is suppressed and no anomaly is observed at high T. Our data confirm that the stripe phase is most stable for x = \(\tfrac{{\text{1}}}{{\text{3}}}\). Moreover, we find clear differences in the thermal conductivity for x > \(\tfrac{{\text{1}}}{{\text{3}}}\) and for x < \(\tfrac{{\text{1}}}{{\text{3}}}\), respectively, which indicates different properties of the stripe ordered phase in these two regions of the phase diagram.
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The anisotropy of KaŇ & and K C has Ňeen discussed in detail in Ref. 14.
The density of the samples amounts to aŇout 80%of the theoretical values.
The polycrystals consist of grains with a typical size larger than 10 μm.
It has Ňeen pointed out in Ref. 14 that the possiŇility of a fluctuating stripe phase aŇove TCO seems to Ňe more likely.
We assume that the sound velocity does not change drastically as a function of x.
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Cassel, D., Hess, C., Büchner, B. et al. Phonon Thermal Conductivity of Stripe Ordering La2–x Sr x NiO4 . Journal of Low Temperature Physics 117, 1083–1087 (1999). https://doi.org/10.1023/A:1022582508916
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DOI: https://doi.org/10.1023/A:1022582508916