TY - JOUR
T1 - Field dependent specific-heat of rare earth manganites
AU - Roy, M.
AU - Mitchell, J. F.
AU - Potashnik, S. J.
AU - Schiffer, P.
N1 - Funding Information:
We are grateful to Dr. A.P. Ramirez for many enlightening discussions. This research has been supported by NSF Grant DMR 97-01548, the Alfred P. Sloan Foundation and the Department of Energy, Basic Energy Sciences-Materials Sciences under Contract #W-31-109-ENG-38.
PY - 2000/8/1
Y1 - 2000/8/1
N2 - The low-temperature specific heat C(H) of several rare-earth manganites (La0.7Sr0.3MnO3, Nd0.5Sr0.5MnO3, Pr0.5Sr0.5MnO3, La0.67Ca0.33MnO3, La0.5Ca0.5MnO3, La0.45Ca0.55MnO3 and La0.33Ca0.67MnO3) was measured as a function of magnetic field. We observed behavior consistent with thermodynamic expectations, i.e., C(H) decreases with field for ferromagnetic metallic compounds by an amount which is in quantitative agreement with spin-wave theory. We also find that C(H) increases with field in most compounds with a charge-ordered antiferromagnetic ground state. In compounds which show evidence of a coexistence of ferromagnetic metallic and antiferromagnetic charge-ordered states, C(H) displays some unusual non-equilibrium effects presumably associated with the phase-separation of the two states. We also observe a large anomalous low-temperature specific heat at the doping-induced metal-insulator transition (at x = 0.50) in La1-xCaxMnO3.
AB - The low-temperature specific heat C(H) of several rare-earth manganites (La0.7Sr0.3MnO3, Nd0.5Sr0.5MnO3, Pr0.5Sr0.5MnO3, La0.67Ca0.33MnO3, La0.5Ca0.5MnO3, La0.45Ca0.55MnO3 and La0.33Ca0.67MnO3) was measured as a function of magnetic field. We observed behavior consistent with thermodynamic expectations, i.e., C(H) decreases with field for ferromagnetic metallic compounds by an amount which is in quantitative agreement with spin-wave theory. We also find that C(H) increases with field in most compounds with a charge-ordered antiferromagnetic ground state. In compounds which show evidence of a coexistence of ferromagnetic metallic and antiferromagnetic charge-ordered states, C(H) displays some unusual non-equilibrium effects presumably associated with the phase-separation of the two states. We also observe a large anomalous low-temperature specific heat at the doping-induced metal-insulator transition (at x = 0.50) in La1-xCaxMnO3.
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U2 - 10.1016/S0304-8853(00)00393-0
DO - 10.1016/S0304-8853(00)00393-0
M3 - Article
AN - SCOPUS:0034251182
SN - 0304-8853
VL - 218
SP - 191
EP - 197
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
IS - 2
ER -