Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-05-06
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages including 3 figures
Scientific paper
10.1103/PhysRevB.69.180405
The effect of quenched disorder on the multiphase competition has been investigated by examining the pressure phase diagram of half doped manganite Ln0.5B0.5MnO3 (Ln = Sm and Nd) with A-site disorders. Sm0.5Ba0.5MnO3, a spin glass insulator at ambient pressure, switches to a ferromagnetic metal with increasing pressure, followed by a rapid increase of the ferromagnetic transition temperature Tc. The rapid increase of Tc was confirmed also for Nd0.5Ba0.5MnO3. These observations indicate that the unusual suppression of the multicritical phase boundary in the A-site disordered system, previously observed as a function of the averaged A-site ionic radius, is essentially controlled by the pressure and hence the band width. The effect of quenched disorder is therefore much enhanced with approaching the multicritical region.
Akahoshi Daisuke
Takagi Hidekazu
Takeshita Nao
Terakura C.
Tokura Yasuhiro
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