Physics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004njph....6..143y&link_type=abstract
New Journal of Physics, Volume 6, Issue 1, pp. 143 (2004).
Physics
1
Scientific paper
A systematic study of the thermal conductivity of single-crystal samples of the {\rm La}_{2-x}{\rm Sr}_x{\rm CuO}_{4} superconductive system and comparison with that of {\rm La}_{1.60-x}{\rm Nd}_{0.40}{\rm Sr}_{x}{\rm CuO}_4\, (x=0.12, 0.15 and 0.20) have demonstrated that this measurement is a useful indirect probe of mechanisms that suppress phonons. The data distinguish octahedral-site rotational or charge-order fluctuations above a structural order disorder transition and two-phase fluctuations associated with locally cooperative atomic displacements within two-dimensional sheets that segregate hole-rich and hole-poor regions in a mixed-valent system. The former suppress phonons in both the basal plane and along the apical axis, whereas the latter only suppress phonons in the basal plane. The data support a spinodal phase segregation below room temperature into the parent and the superconductive phases in the underdoped compositional range as well as the superconductive and metallic phases in the overdoped compositions; they also support the existence of locally cooperative bond-length fluctuations in the normal state of the superconductive phase that prevent the formation of a percolative matrix capable of supporting phonons. Restoration of the phonons below Tc signals a long-range, dynamic ordering of the bond-length fluctuations which implies stabilization of a travelling charge-density wave with possible hybridization of electrons and phonons below Tc to give heavy vibrons that pair in the superconductive phase.
Goodenough J. B.
Yan J.-Q.
Zhou J.-S.
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