Physics – Condensed Matter – Materials Science
Scientific paper
2004-06-23
Phys. Rev. Lett. 93, 227202 (2004).
Physics
Condensed Matter
Materials Science
REVTeX 4 style; 4 pages, 4 figures; revised 4/9 and accepted for publication
Scientific paper
10.1103/PhysRevLett.93.227202
The magnetic and electrical properties of high quality single crystals of $A$-site disordered (solid solution) Ln$_{0.5}$Ba$_{0.5}$MnO$_3$ are investigated near the phase boundary between the spin glass insulator and colossal-magnetoresistive ferromagnetic metal, locating near Ln = Sm. The temperature dependence of the ac-susceptibility and the x-ray diffuse scattering of Eu$_{0.5}$Ba$_{0.5}$MnO$_3$ are analyzed in detail. The uniformity of the random potential perturbation in Ln$_{0.5}$Ba$_{0.5}$MnO$_3$ crystals with small bandwidth yields, rather than the phase separation, an homogeneous short ranged charge/orbital order which gives rise to a nearly-atomic spin glass state. Remarkably, this microscopically disordered ``CE-glass'' state alone is able to bring forth the colossal magnetoresistance.
Akahoshi Daisuke
Asamitsu A.
Mathieu Renaud
Tokura Yasuhiro
Tomioka Yasuhide
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