2003/04/30 by X. F. Sun, Seiki Komiya, Yoichi Ando
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.67.184512
published as Phys. Rev. B 67, 184512 (2003) · 7 pages, 5 figures, final version published in Phys. Rev. B
openalex publication_date 2003/05/08 · arxiv created 2003/05/09 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
To study the rare-earth doping effect on the phonon heat transport of La-based cuprates and shed light on the mechanism of phonon scattering, both ab-plane and c-axis thermal conductivities (\ensuremathκab and \ensuremathκc) are measured for La_2\ensuremath-yEuyCuO4 (y=0, 0.02 and 0.2) and La_1.88\ensuremath-yEuySr0.12CuO4 (y=0 and 0.2) single crystals. It is found that the phonon peak (at 20--25 K) in \ensuremathκab(T) of La_2\ensuremath-yEuyCuO4 shows an anomalous Eu-doping dependence: it completely disappears for y=0.02, which is discussed to be due to the local lattice distortions around Eu dopants, and reappears for y=0.2 with much smaller peak magnitude compared to y=0 sample. In contrast to the strong suppression of the phonon peak in Eu-doped La2CuO4, Eu-doping to La1.88Sr0.12CuO4 enhances the low-T phonon heat transport that results in the reappearance of the phonon peak in this charge-carrier-doped system. The data clearly show that the establishment of static stripe phase rather than the structural change is responsible for the reappearance of phonon peak.