{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,24]],"date-time":"2026-01-24T18:54:39Z","timestamp":1769280879482,"version":"3.49.0"},"reference-count":23,"publisher":"World Scientific Pub Co Pte Lt","issue":"15","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Int. J. Mod. Phys. B"],"published-print":{"date-parts":[[2007,6,10]]},"abstract":"<jats:p> We report here the electrical resistivity, ac susceptibility, low field magneto-resistance (LFMR) and structural parameters of the Pr <jats:sub>1-x<\/jats:sub> Ba <jats:sub>x<\/jats:sub> MnO <jats:sub>3<\/jats:sub>(x= 0.33\u20130.80) system. Samples with 33% and 40% Ba -content exhibit two clear transitions in their resistivity-temperature behavior while signatures of higher temperature transition are also seen in the 50% Ba sample. The higher temperature transition (insulator-metal, T<jats:sub>p1<\/jats:sub>), like in other CMR materials, results due to competition between the double exchange and super exchange mechanisms. The lower temperature broad hump (T<jats:sub>p2<\/jats:sub>) in resistivity reflects the strain effect at the grain boundaries due to the ionic radii mismatch between Pr <jats:sup>+3<\/jats:sup> and Ba <jats:sup>+2<\/jats:sup>. The low field magneto-resistance (at 0.15T) also corroborates the above results as MR peaks near T<jats:sub>p1<\/jats:sub> and increases further at lower temperatures, reflecting the contribution from the grain boundaries. Susceptibility measurements show the Curie transition (T<jats:sub>c<\/jats:sub>) to be near T<jats:sub>p1<\/jats:sub> of the \u03c1-T data. Results are found to be consistent with the (NdBa) MnO <jats:sub>3<\/jats:sub> and (LaBa) MnO <jats:sub>3<\/jats:sub> systems. Resistivity data on the Pr <jats:sub>0.67<\/jats:sub> Sr <jats:sub>0.33<\/jats:sub> MnO <jats:sub>3<\/jats:sub> system, where the lower temperature transition at T<jats:sub>p2<\/jats:sub> is not seen due to the smaller ionic size difference of ( Pr <jats:sup>+3<\/jats:sup>\u2013 Sr <jats:sup>+2<\/jats:sup>) compared to ( Pr <jats:sup>+3<\/jats:sup>\u2013 Ba <jats:sup>+2<\/jats:sup>), also substantiate these results. The observed resistivity upturn at low temperatures is considered in terms of the ensuing localization of carriers due to the varying degree of ionic size mismatch in these systems. <\/jats:p>","DOI":"10.1142\/s0217979207037284","type":"journal-article","created":{"date-parts":[[2007,7,4]],"date-time":"2007-07-04T07:43:10Z","timestamp":1183534990000},"page":"2647-2656","source":"Crossref","is-referenced-by-count":9,"title":["STRUCTURAL, ELECTRICAL AND MAGNETIC PROPERTIES OF <font>Pr<\/font><sub>1-x<\/sub><font>Ba<\/font><sub>x<\/sub><font>MnO<\/font><sub>3<\/sub>(x=0.33\u20130.80)"],"prefix":"10.1142","volume":"21","author":[{"given":"NEERAJ","family":"PANWAR","sequence":"first","affiliation":[{"name":"National Physical Laboratory, Dr. K. S. Krishnan Road, New Delhi-110012, India"},{"name":"Department of Physics, Indian Institute of Technology, Hauz Khas, New Delhi-110016, India"}]},{"given":"S. K.","family":"AGARWAL","sequence":"additional","affiliation":[{"name":"National Physical Laboratory, Dr. K. S. Krishnan Road, New Delhi-110012, India"}]},{"given":"G. L.","family":"BHALLA","sequence":"additional","affiliation":[{"name":"Department of Physics and Astrophysics, University of Delhi, Delhi-110007, India"}]},{"given":"D.","family":"KAUR","sequence":"additional","affiliation":[{"name":"Department of Physics, Indian Institute of Technology, Roorkee-247667, India"}]},{"given":"D. K.","family":"PANDYA","sequence":"additional","affiliation":[{"name":"Department of Physics, Indian Institute of Technology, Hauz Khas, New Delhi-110016, India"}]}],"member":"219","published-online":{"date-parts":[[2012,1,25]]},"reference":[{"key":"rf1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.71.2331"},{"key":"rf2","doi-asserted-by":"publisher","DOI":"10.1126\/science.264.5157.413"},{"key":"rf3","doi-asserted-by":"publisher","DOI":"10.1126\/science.270.5238.961"},{"key":"rf4","doi-asserted-by":"publisher","DOI":"10.1063\/1.123002"},{"key":"rf5","doi-asserted-by":"publisher","DOI":"10.1063\/1.364585"},{"key":"rf6","doi-asserted-by":"publisher","DOI":"10.1063\/1.881459"},{"key":"rf7","doi-asserted-by":"publisher","DOI":"10.1063\/1.116635"},{"key":"rf8","doi-asserted-by":"publisher","DOI":"10.1088\/0034-4885\/65\/2\/202"},{"key":"rf9","doi-asserted-by":"publisher","DOI":"10.1016\/S0304-8853(03)00209-9"},{"key":"rf10","doi-asserted-by":"publisher","DOI":"10.1016\/j.ssc.2005.02.030"},{"key":"rf11","doi-asserted-by":"publisher","DOI":"10.1088\/0022-3727\/36\/3\/301"},{"key":"rf12","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.51.6143"},{"key":"rf13","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.77.2041"},{"key":"rf14","first-page":"629","volume":"54","author":"Gupta A.","journal-title":"Phys. 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