2017
DOI: 10.1063/1.4977580
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Transverse spin relaxation and magnetic correlation in Pr1−x Ca x MnO3: Influence of particle size variation and chemical doping

Abstract: The short ranged magnetic correlations and dynamics of hole doped Pr1–xCaxMnO3 (0.33 < x < 0.5) of different crystallite sizes have been investigated using electron spin resonance spectroscopy. The major contribution to the temperature dependence of paramagnetic line-width is attributed to the spin-lattice relaxation dominated by thermally activated hopping of small polarons with the typical activation energy of 20–50 meV. Irrespective of the crystallite size and dopant concentration, the transve… Show more

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Cited by 5 publications
(4 citation statements)
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“…Additionally, the small value of g and H pp signifies the strong super-exchange interaction. After this, the lower g and H pp values for dextran and chitosan-coated MNPs illustrate a stochastic arrangement of magnetic moments with enhancing particle size 39 41 . As enumerated in Table 2 , the listed lower spin–spin relaxation time (τ 1 ) for coated samples rather than the uncoated one can lead to an ability of higher power dissipation of the synthesized MNPs 42 .…”
Section: Resultsmentioning
confidence: 97%
“…Additionally, the small value of g and H pp signifies the strong super-exchange interaction. After this, the lower g and H pp values for dextran and chitosan-coated MNPs illustrate a stochastic arrangement of magnetic moments with enhancing particle size 39 41 . As enumerated in Table 2 , the listed lower spin–spin relaxation time (τ 1 ) for coated samples rather than the uncoated one can lead to an ability of higher power dissipation of the synthesized MNPs 42 .…”
Section: Resultsmentioning
confidence: 97%
“…A comparison of the LF/HF signals and PM signals shows that the fraction of spins contributing to the LF and HF resonances are ≤ 1.7% and ≤ 1.65%, respectively, which are slightly higher than the corresponding bulk sample. The mismatch of the anomalies in the macroscopic susceptibility and the LF/HF signal parameters can be attributed to the increased FM correlation in the main signal due to reduction in grain size [48] as well as the distribution of the grain size in the nanocrystalline sample.…”
mentioning
confidence: 99%
“…Furthermore, the small value of g and H pp signifies the strong superexchange interaction. Henceforward, the lower g and H pp values for dextran- and chitosan-coated Gd-doped MNPs suggest a random alignment of magnetic moments with improving particle size. …”
Section: Resultsmentioning
confidence: 99%