Hydrothermal synthesis of single-crystalline La0.5Ca0.5MnO3 nanowires at low temperature

Zhang, T.; Jin, Chuangui; Qian, Tian; Lü, Xiaoli; Bai, Junhong; Li, X. G.

doi:10.1039/b405288a

Cited by 69 publications

(53 citation statements)

References 32 publications

(31 reference statements)

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“…[6][7][8][9][10][11][12][13][14] Interestingly, the issues of magnetic phase separation driven by suppression of CO has been argued in various possible ways to interpret the observed results in similar nanocrystalline CO compounds. For example, possible phase separation between FM and AFM was pointed out in nanocrystalline Pr 0.5 Ca 0.5 MnO 3 .…”

Section: +mentioning

confidence: 99%

“…22 The weak ferromagnetism was conjectured from appearance of coercivity at room temperature, which was suggested to be correlated with the lattice distortion, in which volume of the unit cell increased with decreasing grain size. The destabilization of CO and appearance of ferromagnetism due to reduction of grain size are rather typical manifestations of charge-ordered compounds, [6][7][8][9]22 although elucidation of microscopic origin of emerging ferromagnetism has been less probed so far. 8,23,24 This can be established through careful investigations by means of microscopic experimental tools such as neutron, NMR, Mössbauer studies.…”

Section: Introductionmentioning

confidence: 99%

“…5 Recently, CO phenomenon has been investigated in nanocrystalline manganites. [6][7][8][9][10] It has been shown that size reduction induces a weakening of CO and the appearance of weak ferromagnetism as a consequence of size reduction. The particle-size-driven intricate interplay between antiferromagnetic (AFM) CO, ferromagnetic (FM), and reentrant-spin-glass-like states was observed in Nd 0.8 Na 0.2 MnO 3 .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Glassy magnetic phase driven by short-range charge and magnetic ordering in nanocrystalline La1/3Sr2/3FeO
Sabyasachi
¹
,
Patra
²
,
Majumdar
³

et al. 2012
Phys. Rev. B

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The charge ordered La 1/3 Sr 2/3 FeO 3−δ (LSFO) in bulk and nanocrystalline forms are investigated using ac and dc magnetization, Mössbauer, and polarized neutron studies. A complex scenario of short-range charge and magnetic ordering is realized from the polarized neutron studies in nanocrystalline specimen. This short-range ordering does not involve any change in spin state and modification in the charge disproportion between Fe 3+ and Fe 5+ compared to bulk counterpart as evident in the Mössbauer results. The refinement of magnetic diffraction peaks provides magnetic moments of Fe 3+ and Fe 5+ are about 3.15 μ B and 1.57 μ B for bulk, and 2.7 μ B and 0.53 μ B for nanocrystalline specimen, respectively. The destabilization of charge ordering leads to magnetic phase separation, giving rise to the robust exchange bias (EB) effect. Strikingly, EB field at 5 K attains a value as high as 4.4 kOe for average size ∼70 nm, which is zero for the bulk counterpart. A strong frequency dependence of ac susceptibility reveals cluster-glass-like transition around ∼65 K, below which EB appears. Overall results propose that finite-size effect directs the complex glassy magnetic behavior driven by unconventional short-range charge and magnetic ordering, and magnetic phase separation appears in nanocrystalline LSFO.

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Section: +mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Glassy magnetic phase driven by short-range charge and magnetic ordering in nanocrystalline La1/3Sr2/3FeO
Sabyasachi
¹
,
Patra
²
,
Majumdar
³

et al. 2012
Phys. Rev. B

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“…This result has important implications for nano-device applications of manganites and to the best of our knowledge, is the first report of charge order suppression in a one dimensional manganite system. The nanowires of PCMO (x=0.5) were prepared using the hydrothermal method [6][7][8] .…”

mentioning

confidence: 99%

Weakening of charge order and antiferromagnetic to ferromagnetic switch over in Pr0.5Ca0.5MnO3 nanowires

Rao

Anuradha

Sarangi

et al. 2005

Applied Physics Letters

117

113

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We have prepared crystalline nanowires (diameter ~ 50 nm, length ~ a few microns) of the charge ordering manganite Pr 0.5 Ca 0.5 MnO 3 using a low reaction temperature hydrothermal method and characterized them using X-ray diffraction, transmission electron microscopy, SQUID magnetometry and electron magnetic resonance measurements. While the bulk sample shows a charge ordering transition at 245 K and an antiferromagnetic transition at 175 K, SQUID magnetometry and electron magnetic resonance experiments reveal that in the nanowires phase, a ferromagnetic transition occurs at ~ 105 K. Further, the antiferromagnetic transition disappears and the charge ordering transition is suppressed. This result is particularly significant since the charge order in Pr0.5Ca0.5MnO3 is known to be very robust, magnetic fields as high as 27 T being needed to melt it. a) Electronic mail: svbhat@physics.iisc.ernet.in 1

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“…Recently, several experimental and theoretical studies have been focused on the exploration of the grain size effect on the functional properties of doped perovskite manganites [1][2][3][4][5][6][7][8][9][10]. These studies clearly highlight the significance of broken exchange bonds between the surface Mn cations and their likely impact on the magnetic * E-mail: pawangk@yahoo.co.in; Fax: +91-120-2400986 properties.…”

Section: Introductionmentioning

confidence: 99%

Anomalous Weak Ferromagnetism in Electron-doped Nd1-xSrxMnO3 (0.50 ¡? x ¡? 0.62) Thin Films

Kumar¹,

Prasad²,

Srivastava³

et al. 2011

J. Korean Phy. Soc.

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In the present work, we demonstrate that an anomalous weak ferromagnetism occurs in the composition range 0.50 ≤ x ≤ 0.62 in nanostructured thin films of Nd1−xSrxMnO3 (NSMO). Nanocrystalline thin films of overdoped manganite Nd1−xSrxMnO3 (x ∼ 0.50, 0.55, 0.60, and 0.62) are grown on single-crystal LaAlO3 (001) substrates by using a nebulized chemical spray pyrolysis technique. These single phase films possess an average crystallite size ∼15 nm, and the width of the grain boundaries is ∼1 -2 nm. In the composition range 0.50 ≤ x ≤ 0.62, the ground state of NSMO is an A-type antiferromagnetic (AFM) metallic state. However, in the present films, a broad paramagnetic (PM)-to-ferromagnetic (FM) transition is observed in all the compositions, at TC ∼ 226 K for x = 0.50 and at 235 K for rest of the samples. All the films show a well-defined M-H hysteresis loop at 5 K. The coercivity (HC ) of these films is much larger than those having compositions in the range 0.35 < x < 0.45. For x = 0.50 (0.62), the films HC = -1210 (-1484) Oe and +1162 (+1476) Oe. The asymmetry in the coercivity suggests the presence of a weak exchange bias effect in these films. The FM ground state in these films is observed to have a smaller magnetic moment per Mn atom than the expected full moment from the rigid model; we term this as a weak ferromagnetic (WFM) state arising due to the destabilization of the AFM ordering. We propose a possible scenario based on the combined effect of spin reorganization and enhanced orbital disordering in nanosized manganites to explain the observed anomalous weak ferromagnetism in the A-type AFM spin ordered region.

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Hydrothermal synthesis of single-crystalline La0.5Ca0.5MnO3 nanowires at low temperature

Cited by 69 publications

References 32 publications

Glassy magnetic phase driven by short-range charge and magnetic ordering in nanocrystalline La1/3Sr2/3FeO
Sabyasachi
¹
,
Patra
²
,
Majumdar
³

et al. 2012
Phys. Rev. B

Glassy magnetic phase driven by short-range charge and magnetic ordering in nanocrystalline La1/3Sr2/3FeO
Sabyasachi
¹
,
Patra
²
,
Majumdar
³

et al. 2012
Phys. Rev. B

Weakening of charge order and antiferromagnetic to ferromagnetic switch over in Pr0.5Ca0.5MnO3 nanowires

Anomalous Weak Ferromagnetism in Electron-doped Nd1-xSrxMnO3 (0.50 ¡? x ¡? 0.62) Thin Films

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Hydrothermal synthesis of single-crystalline La0.5Ca0.5MnO3 nanowires at low temperature

Cited by 69 publications

References 32 publications

Glassy magnetic phase driven by short-range charge and magnetic ordering in nanocrystalline La1/3Sr2/3FeOSabyasachi1, Patra2, Majumdar3 et al. 2012Phys. Rev. B

Glassy magnetic phase driven by short-range charge and magnetic ordering in nanocrystalline La1/3Sr2/3FeOSabyasachi1, Patra2, Majumdar3 et al. 2012Phys. Rev. B

Weakening of charge order and antiferromagnetic to ferromagnetic switch over in Pr0.5Ca0.5MnO3 nanowires

Anomalous Weak Ferromagnetism in Electron-doped Nd1-xSrxMnO3 (0.50 ¡? x ¡? 0.62) Thin Films

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About

Glassy magnetic phase driven by short-range charge and magnetic ordering in nanocrystalline La1/3Sr2/3FeO
Sabyasachi
¹
,
Patra
²
,
Majumdar
³

et al. 2012
Phys. Rev. B

Glassy magnetic phase driven by short-range charge and magnetic ordering in nanocrystalline La1/3Sr2/3FeO
Sabyasachi
¹
,
Patra
²
,
Majumdar
³

et al. 2012
Phys. Rev. B