Magnetic transport behavior of nanocrystalline Nd0.67A0.33MnO3 (A=Ca, Sr, Pb and Ba)

Krishna, D.C.; Lakshmi, Y. Kalyana; Sreedhar, B.; Reddy, P. Venugopal

doi:10.1016/j.solidstatesciences.2009.04.002

Cited by 19 publications

(4 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For pristine and oxygen treated films, the FC magnetization increases significantly as the temperature decreases and ZFC curves show a large peak below Curie temperature. This λ shape behaviour has also been observed in the electron doped region of other manganites [38,39]. It is assumed that the peak in ZFC curves can be attributed to cluster glass arising from competition between ferromagnetic (FM) phase arrested in antiferromagnetic (AFM) phase (figure 5).…”

Section: Oxygen Vacancy Defined Magnetic and Magnetoresistive Propertiessupporting

confidence: 56%

Manipulating magnetic and magnetoresistive properties by oxygen vacancy complexes in GCMO thin films

Beiranvand¹,

Liedke²,

Haalisto³

et al. 2022

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

The effect of in situ annealing is investigated in Gd0.1Ca0.9MnO3 (GCMO) thin films in oxygen and vacuum atmospheres. We show that the reduction of oxygen content in GCMO lattice by vacuum annealing induced more oxygen complex vacancies in both subsurface and interface regions and larger grain domains when compared with the pristine one. Consequently, the double exchange interaction is suppressed and the metallic-ferromagnetic state below Curie temperature turned into spin-glass insulating state. In contrast, the magnetic and resistivity measurements show that the oxygen treatment increases ferromagnetic phase volume, resulting in greater magnetization (MS) and improved magnetoresistivity properties below Curie temperature by improving the double exchange interaction. The threshold field to observe the training effect is decreased in oxygen treated film. In addition, the positron annihilation spectroscopy analysis exhibits fewer open volume defects in the subsurface region for oxygen treated film when compared with the pristine sample. These results unambiguously demonstrate that the oxygen treated film with significant spin memory and greater magnetoresistance can be a potential candidate for the future memristor applications.

show abstract

Section: Oxygen Vacancy Defined Magnetic and Magnetoresistive Propertiessupporting

confidence: 56%

Manipulating magnetic and magnetoresistive properties by oxygen vacancy complexes in GCMO thin films

Beiranvand¹,

Liedke²,

Haalisto³

et al. 2022

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

show abstract

“…Further, even at fields of 1 and 3 T, no M-I transition in NCMO could be observed. However, when the field was increased to 5 T, an M-I transition appeared and this transition was strengthened when the field was increased to 8 T. Surprisingly, the same composition in the nanocrystalline form exhibited an M-I transition at about 90 K even at zero field [19], indicating that the appearance of M-I transition may be attributed to the presence of nanocrystallites in the material. A similar appearance of M-I transition was reported earlier in nanocrystalline Nd 0.5 Ca 0.5 MnO 3 [20], and the observed behaviour was attributed to the suppression of CO and antiferromagnetic states and the appearance of FM state due to surface effects.…”

Section: Field-induced Transitions In Ncmomentioning

confidence: 94%

Low-temperature resistivity anomalies and magnetic field-induced transitions in neodymium-based manganites

Lalitha

Reddy

2010

Phys. Scr.

View full text Add to dashboard Cite

To investigate the magnetotransport behaviour of Nd0.67A0.33MnO3 (where A=Ca, Sr, Pb and Ba) materials, samples were prepared by the sol–gel route. The materials were characterized by x-ray diffraction (XRD) and it was found that all the samples have orthorhombic structure with pnma space group. All the samples except Nd0.67Ca0.33MnO3 (NCMO) were found to exhibit a clear metal-to-insulator (M–I) transition. Nd0.67Ca0.33MnO3, however, was found to exhibit an M–I transition on applying a magnetic field of 5 T and this transition was strengthened when the field was enhanced to 8 T. The field-induced transition in NCMO may be attributed to the presence of ferromagnetic clusters in an antiferromagnetic matrix. Further, all the samples were found to show an upturn in resistivity at about 30 K, and the observed behaviour can be explained based on theory that it is a combined effect of weak localization, the Kondo effect and electron–electron and electron–phonon scattering. Finally, the magnetoresistance (MR) of NCMO is found to be as high as 99%, indicating that it may be exploited for some devices.

show abstract

“…With increase in temperature, an increase in thermal energy allows more and more domains to align along the field direction thereby enhancing the magnetization. One may therefore conclude that higher applied field helps the domains to overcome the pinning [22].…”

Section: Magnetization Measurementsmentioning

confidence: 97%

Magnetic transport behavior of nano-crystalline Pr0.67A0.33MnO3 (A = Ca, Sr, Pb and Ba) manganites

Krishna

Reddy

2009

Journal of Alloys and Compounds

Self Cite

View full text Add to dashboard Cite

Magnetic transport behavior of nanocrystalline Nd0.67A0.33MnO3 (A=Ca, Sr, Pb and Ba)

Cited by 19 publications

References 29 publications

Manipulating magnetic and magnetoresistive properties by oxygen vacancy complexes in GCMO thin films

Manipulating magnetic and magnetoresistive properties by oxygen vacancy complexes in GCMO thin films

Low-temperature resistivity anomalies and magnetic field-induced transitions in neodymium-based manganites

Magnetic transport behavior of nano-crystalline Pr0.67A0.33MnO3 (A = Ca, Sr, Pb and Ba) manganites

Contact Info

Product

Resources

About