Phase separation in Pr0.7Ca0.3MnO0.3: a case of weak quenched disorder

Details Phase separation in Pr0.7Ca0.3MnO0.3: a case of weak quenched disorder Phase separation in Pr0.7Ca0.3MnO0.3: a case of weak quenched disorder

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004njph....6..195a&link_type=abstract

New Journal of Physics, Volume 6, Issue 1, pp. 195 (2004).

Physics

7

Scientific paper

Phase separation (PS) in manganites has been suggested to arise as a consequence of quenched disorder due to the size mismatch of the A-site cations in the perovskite lattice. In this paper, we have used single crystal x-ray and in-field neutron diffraction measurements to investigate PS in Pr0.7Ca0.3MnO3, a compound with weak quenched disorder. Above the charge/ordering transition, our measurements show CE-type clusters with a coherence length of ~20 Å. At TCE = 220 K the coherence length of the diffuse scattering diverges as a long-range ordered CE state is formed. Concurrently, the Huang scattering abruptly decreases at TCE as the diffuse CE-type reflections develop into Bragg reflections, suggesting that the transition to the CE-state is of the disorder order type. Our neutron measurements of the ferromagnetic (FM) and antiferromagnetic (AF) ordering in Pr0.7Ca0.3MnO3, show the presence of FM 200 Å clusters coexisting with long range AF and FM phases. Application of field after zero-field-cooling leads to the reduction of the diffuse FM scattering. We argue that PS in this compound arises as a consequence of the Jahn Teller strain from Mn3+ centres that act like quenched disorder.

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