Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-04-11
Physics
Condensed Matter
Strongly Correlated Electrons
submitted to PRL 5 pages, 3 figures included
Scientific paper
10.1103/PhysRevB.62.R6093
We report low temperature specific heat measurements of Pr$_{1-x}$Ca$_{x}$MnO$_{3}$ ($0.3\leq x \leq 0.5$) and La$_{0.5}$Ca$_{0.5}$MnO$_{3}$ with and without applied magnetic field. An excess specific heat, $C^{\prime}(T)$, of non-magnetic origin associated with charge ordering is found for all the samples. A magnetic field sufficient to induce the transition from the charge-ordered state to the ferromagnetic metallic state does not completely remove the $C^{\prime}$ contribution. This suggests that the charge ordering is not completely destroyed by a "melting" magnetic field. In addition, the specific heat of the Pr$_{1-x}$Ca$_{x}$MnO$_{3}$ compounds exhibit a large contribution linear in temperature ($\gamma T$) originating from magnetic and charge disorder.
Biswas Amlan
Cheong Sang-Wook
Greene Richard L.
Kim Bog-Gi
Kim Kyung Hyuk
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