| Autor: |
Hlubek, N., Ribeiro, P., Saint-Martin, R., Nishimoto, S., Revcolevschi, A., Drechsler, S. -L., Behr, G., Trinckauf, J., Hamann-Borrero, J. E., Geck, J., Büchner, B., Hess, C. |
| Rok vydání: |
2011 |
| Předmět: |
|
| Zdroj: |
Phys. Rev. B 84, 214419 (2011) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.84.214419 |
| Popis: |
We study the impact of a weak bond disorder on the spinon heat transport in the S=1/2 antiferromagnetic (AFM) Heisenberg chain material Sr_{1-x}Ca_xCuO_2. We observe a drastic suppression in the magnetic heat conductivity kappa_mag even at tiny disorder levels (i.e., Ca-doping levels), in stark contrast to previous findings for kappa_mag of S=1/2 two-dimensional square lattice and two-leg spin-ladder systems, where a similar bond disorder has no effect on kappa_mag. Hence, our results underpin the exceptional role of integrability of the S=1/2 AFM Heisenberg chain model and suggest that the bond disorder effectively destroys the ballistic nature of its heat transport. We further show that the suppression of kappa_mag is captured by an effective spinon-impurity scattering length, which exhibits the same doping dependence as the long-distance exponential decay length of the spin-spin correlation as determined by density-matrix renormalization group calculations. |
| Databáze: |
arXiv |
| Externí odkaz: |
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