Astract
The structural, electronic and magnetic properties of La0.55Ca0.45MnO3 were measured. A rapid change of lattice parameters appeared around 190 K associated with the d 2 z orbital ordering and charge ordering (CO) states that were reflected by both magnetization and resistivity. Great difference of magnetizations between the field-cooling (FC) and zero-field-cooling (ZFC) modes below the charge ordering temperature T CO in high magnetic field (H > 4 T) was clearly seen. A field of 5 T (threshold field) is sufficient to completely destroy the antiferromagnetic (AFM) CO state for FC mode in magnetization while it is not the case for ZFC mode. A much larger field (larger than 10 T from ZFC resistivity data) is needed to destroy the CO state for ZFC mode. This could be explained by the coexistence and transformation of two phases reported by Huang et al. For ZFC mode, with increasing H, T CO gradually moves to low temperature regime and the relationship between the critical field H C (0) to destroy CO state and T CO conforms to a power law H C=H C(0)(1−T/T CO(0))γ, where H C (0) is the critical field to destroy the CO state at 0 K, and T CO (0) is the CO temperature in zero field.
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References
Tokura Y. Colossal Magnetoresistive Oxides. Tokyo: Gordon & Breach, 1999. 1–65
Huang Q, Lynn J W, Erwin R W, et al. Temperature and field dependence of the phase separation, structure, and magnetic ordering in La1−x CaxMnO3 (x=0.47, 0.50, and 0.53). Phys Rev B, 2000, 61: 8895–8905
Radaelli P G, Cox D E, Marezio M, et al. Charge, orbital, and magnetic ordering in La0.5Ca0.5MnO3. Phys Rev B, 1997, 55: 3015–3023
Mori S, Chen C H, Cheong S W. Paired and unpaired charge stripes in the ferromagnetic phase of La0.5Ca0.5MnO3. Phys Rev Lett, 1998, 81: 3972–3975
Kim K H, Uehara M, Cheong S W. High-temperature charge-ordering fluctuation in manganites. Phys Rev B, 2000, 62: R11945–R11948
Respaud M, Broto J M, Rakoto H, et al. Stability of charge-ordering and H-T diagrams of Ln1−x CaxMnO3 manganites in pulsed magnetic field up to 50 T. J Magn Magn Mater, 2000, 211: 128–132
Freitas R S, Ghivelder L, Levy P, et al. Magnetization studies of phase separation in La0.5Ca0.5MnO3. Phys Rev B, 2002, 65: 104403
Loudon J C, Mathur N D, Midgley P A. Charge-ordered ferromagnetic phase in La0.5Ca0.5MnO3. Nature, 2002, 420: 797–800
Sudheendra L, Raju A R, Rao C N R. Current-induced phase control in charged-ordered Nd0.5Ca0.5MnO3 and Pr0.6Ca0.4MnO3 crystals. J Appl Phys, 2004, 95: 2181–2183
Ren Q B, Zhu W T, Hong B, et al. Charge ordering and spin ordering in Nd0.5Sr0.5Mn1−x (Gax,Tix)O3 system. Sci China Ser G-Phys Mech Astron, 2007, 37: 157–164
Sathe V G, Ahlawat A, Rawat R, et al. Effect of strain on the phase separation and devitrification of the magnetic glass state in thin films of La5/8-y PryCa3/8MnO3 (y = 0.45). J Phys: Condens Matter, 2010, 22: 176002
Chatterjee S, Giri S, Majumdar S. Metastability around the insulator-metal transition in La0.2Pr0.5Ca0.3MnO3. J Appl Phys, 2010, 107: 113909
Tao J, Niebieskikwiat D, Varela M, et al. Direct imaging of nanoscale phase separation in La0.55Ca0.45MnO3: Relationship to colossalmagnetoresistance. Phys Rev Lett, 2009, 103: 097202
Zener C. Interaction between the d-Shells in the transition metals. II. Ferromagnetic compounds of manganese with perovskite structure. Phys Rev, 1951, 82: 403–405
Xiao G, Gong G Q, Canedy C L, et al. Magnetic field induced properties of manganite perovskites with colossal magnetoresistance (invited). J Appl Phys, 1997, 81: 5324–5329
Solovyev I V, Terakura K. Magnetic spin origin of the charge-ordered phase in manganites. Phys Rev Lett, 1999, 83: 2825–2828
Mahendiran R, Maignan A, Martin C, et al. Ca0.85Sm0.15MnO3: A mixed antiferromagnet with unusual properties. Phys Rev B, 2000, 62: 11644–11648
Zhao Y G, Cai W, Zhao J, et al. Electrical transport and magnetic properties of La0.5Ca0.5MnO3-y with varying oxygen content. Phys Rev B, 2002, 65: 144406
Zhao Y G, Cai W, Zhao J, et al. Insulator-metal transition and magnetoresistance of La0.5Ca0.5MnOy induced by tuning the oxygen content. J Appl Phys, 2002, 92: 5391–5394
Chen C H, Cheong S W. Commensurate to incommensurate charge ordering and its real-space images in La0.5Ca0.5MnO3. Phys Rev Lett, 1996, 76: 4042–4045
Goodenough J B. Theory of the role of covalence in the perovskite-type manganites [La, M(II)]MnO3. Phys Rev, 1955, 100: 564–573
Cheong S W, Chen C H. Colossal Magnetoresistance, Charge Ordering and Related Properties of Manganese Oxides. In: Rao C N R, Raveau B, eds. Singapore: World Scientific, 1998. 65–90
Pradhan A K, Feng Y, Roul B K, et al. Colossal magnetoresistance in doped manganites: A consequence of percolation and phase separation. Appl Phys Lett, 2001, 79: 506–508
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Li, G., Wang, L. Percolation transport and magnetic transitions in a phase-separated manganite La0.55Ca0.45MnO3 . Sci. China Technol. Sci. 54, 2315–2320 (2011). https://doi.org/10.1007/s11431-011-4478-x
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DOI: https://doi.org/10.1007/s11431-011-4478-x