Probing the existing magnetic phases in Pr{sub 0.5}Ca{sub 0.5}MnO{sub 3} (PCMO) nanowires and nanoparticles: magnetization and magneto-transport investigations Rao, S S; Bhat, S V, E-mail: ssrao@physics.iisc.ernet.i, E-mail: Srinivasarao.singamaneni@fys.kuleuven.b, E-mail: svbhat@physics.iisc.ernet.i [Department of Physics, Indian Institute of Science, Bangalore-560012 (India)] 77 NANOSCIENCE AND NANOTECHNOLOGY; ATOMIC FORCE MICROSCOPY; CALCIUM COMPOUNDS; COOLING; EQUILIBRIUM; FERROMAGNETIC MATERIALS; GROUND STATES; HYSTERESIS; MAGNETIZATION; MANGANATES; METALS; MIXTURES; NANOSTRUCTURES; PHASE TRANSFORMATIONS; PRASEODYMIUM COMPOUNDS; QUANTUM WIRES; TEMPERATURE DEPENDENCE; ALKALINE EARTH METAL COMPOUNDS; DISPERSIONS; ELEMENTS; ENERGY LEVELS; MAGNETIC MATERIALS; MANGANESE COMPOUNDS; MATERIALS; MICROSCOPY; OXYGEN COMPOUNDS; RARE EARTH COMPOUNDS; TRANSITION ELEMENT COMPOUNDS ALKALINE EARTH METAL COMPOUNDS; DISPERSIONS; ELEMENTS; ENERGY LEVELS; MAGNETIC MATERIALS; MANGANESE COMPOUNDS; MATERIALS; MICROSCOPY; NANOSTRUCTURES; OXYGEN COMPOUNDS; RARE EARTH COMPOUNDS; TRANSITION ELEMENT COMPOUNDS We show from conventional magnetization measurements that the charge order (CO) is completely suppressed in 10 nm Pr{sub 0.5}Ca{sub 0.5}MnO{sub 3}(PCMO 10) nanoparticles. Novel magnetization measurements, designed by a special high field measurement protocol, show that the dominant ground state magnetic phase is ferromagnetic-metallic (FM-M), which is an equilibrium phase, which coexists with the residual charge ordered anti-ferromagnetic phase (CO AFM) (an arrested phase) and exhibits the characteristic features of a 'magnetic glassy state' at low temperatures. It is observed that there is a drastic reduction in the field required to induce the AFM to FM transition (approx5-6 T) compared to their bulk counterpart (approx27 T); this phase transition is of first order in nature, broad, irreversible and the coexisting phases are tunable with the cooling field. Temperature-dependent magneto-transport data indicate the occurrence of a size-induced insulator-metal transition (T{sub M} {sub -} {sub I}) and anomalous resistive hysteresis (R-H) loops, pointing out the presence of a mixture of the FM-M phase and AFM-I phase. Available from http://dx.doi.org/10.1088/0953-8984/22/11/116004 United Kingdom 2010-03-24 English Journal Article Journal Name: Journal of Physics. Condensed Matter; Journal Volume: 22; Journal Issue: 11; Other Information: DOI: 10.1088/0953-8984/22/11/116004; PII: S0953-8984(10)32066-2 Medium: X; Size: 9 pages https://doi.org/10.1088/0953-8984/22/11/116004 [] 11 22 Journal ID: ISSN 0953-8984; JCOMEL; TRN: GB10O2509106284 GBN 2012-12-21 21375830