TY - JOUR
T1 - High-field magnetization and magnetoresistance of the A-site ordered perovskite oxide CaCu 3Ti 4-xRu xO 12 (0≤x≤4)
AU - Kida, T.
AU - Kammuri, R.
AU - Hagiwara, M.
AU - Yoshii, S.
AU - Kobayashi, Wataru
AU - Iwakawa, M.
AU - Terasaki, I.
PY - 2012/5/11
Y1 - 2012/5/11
N2 - We have measured high-field magnetization and magnetoresistance of polycrystalline samples of the A-site ordered perovskite CaCu 3Ti 4-xRu xO 12 (0≤x≤4) utilizing a nondestructive pulsed magnet. We find that the magnetization for x=0.5, 1.0, and 1.5 is nonlinear, and tends to saturate in high fields. This is highly nontrivial because the magnetization for x=0 and 4 is linear in external field up to the highest one. We have analyzed this field dependence based on the thermodynamics of magnetic materials, and propose that the external fields delocalize the holes on the Cu2 + ions in order to maximize the entropy. This scenario is qualitatively consistent with a large magnetoresistance of -70% observed at 4.2 K at 52 T for x=1.5.
AB - We have measured high-field magnetization and magnetoresistance of polycrystalline samples of the A-site ordered perovskite CaCu 3Ti 4-xRu xO 12 (0≤x≤4) utilizing a nondestructive pulsed magnet. We find that the magnetization for x=0.5, 1.0, and 1.5 is nonlinear, and tends to saturate in high fields. This is highly nontrivial because the magnetization for x=0 and 4 is linear in external field up to the highest one. We have analyzed this field dependence based on the thermodynamics of magnetic materials, and propose that the external fields delocalize the holes on the Cu2 + ions in order to maximize the entropy. This scenario is qualitatively consistent with a large magnetoresistance of -70% observed at 4.2 K at 52 T for x=1.5.
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U2 - 10.1103/PhysRevB.85.195122
DO - 10.1103/PhysRevB.85.195122
M3 - Article
AN - SCOPUS:84861114207
SN - 1098-0121
VL - 85
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 19
M1 - 195122
ER -