Magnetic ordering: Neutron diffraction and depolarization studies at Dhruva Reactor

Yusuf, S. M.; Chakraborty, Keka R.; Kumar, Amit; Jain, Anil; Siruguri, V.; Babu, P. D.

doi:10.1080/10448632.2014.870442

Cited by 10 publications

(3 citation statements)

References 21 publications

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“…Temperature variation of neutron powder diffraction measurement from 3 K to 300 K was done in a Cryogenics cryogenfree magnet system, by loading the samples in a vanadium can of height 35 mm and diameter 6 mm. ND measurements on LSMO-0.5 bulk sample were performed at the PD-2 diffractometer, Dhruva reactor, Mumbai, India, at a wavelength of 1.244 Å and in the temperature range of 6-300 K [51][52][53]. The ND data were processed with help of the Rietveld refinement program of FullProf Suite software [48,49].…”

Section: Methodsmentioning

confidence: 99%

Size induced magnetic phases in half doped manganite nanowires of La_0.5Sr_0.5MnO₃: a neutron diffraction study

Datta¹,

Kaushik²,

Siruguri³

et al. 2017

J. Phys. D: Appl. Phys.

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field, pressure and biaxial strain. Modification in many physical properties, as well as magnetic properties, is a widely reported phenomenon in nanostructured materials. In complex perovskite oxide one dimensional (1D) nanostructures, studies highlighting structure-magnetic property correlation are not very common. We pursue here crystal and magnetic structure study of half doped manganite nanowires (NWs). Recent reports reveal that the properties of manganites are strikingly altered by nanostructuring [16][17][18][19]-particularly at half doping in nanocrystals (La 0.5 Ca 0.5 MnO 3 ), where size induced destabilization of charge and magnetic ordering was found [4,

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Section: Methodsmentioning

confidence: 99%

Size induced magnetic phases in half doped manganite nanowires of La_0.5Sr_0.5MnO₃: a neutron diffraction study

Datta¹,

Kaushik²,

Siruguri³

et al. 2017

J. Phys. D: Appl. Phys.

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“…The structural parameters for this sample at 5 K are listed in table 2. We carried out neutron depolarization experiments [13][14][15][16][17][18] to see if there was a cluster spin glass like ordering in this sample figure 8. But as is clear from these measurements there was no such ordering.…”

Section: Neutron Diffractionmentioning

confidence: 99%

“…The possibility of Raman shift due to free electron-phonon coupling can also be ruled out as the material under study is an insulator over the above mentioned temperature range. Due to the increase in anharmonicity, the phonon frequency and width of a Raman band vary with temperature by following the relations [18] ( )…”

Section: Spin-phonon Coupling From Raman Scattering Measurementsmentioning

confidence: 99%

Revealing magnetic ordering and spin-phonon coupling in Y_1−xTb_xMnO₃ (0.1 ⩽ x ⩽ 0.3) compounds

Chakraborty

Paul

Shukla

et al. 2017

J. Phys.: Condens. Matter

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The structural and magnetic properties of the Y Tb MnO (0.1 ⩽ x ⩽ 0.3) compounds were investigated. Neutron diffraction patterns for all three samples, recorded at room temperature (RT), were fitted to the nuclear structure confirming the paramagnetic nature of the compounds. At 2.8 K, for the x = 0.1 sample magnetic moments of the Tb ionic as well as Mn ionic were ordered. At 5 K for the x = 0.2 sample only the Mn ionic magnetic moments were ordered. There were six sites for Mn atoms. Three on the z = 0 plane and three on the z = 0.5 plane (where z corresponds to +c axis).The Mnionic moments were confined to the a-b plane with a net magnitude of 2.78(3) µ , and 2.90(3) µ for the x = 0.1 and the x = 0.2 samples. The Tbionic moments had a magnitude of 1.36(4) µ at 2.8 K and were aligned antiferromagnetically along the crystallographic c-axis for the x = 0.1 sample. The low moment in comparison with Mn free ions has been attributed to crystalline electric fields similar to that found in the parent compound YMnO and also in another rare earth manganite viz HoMnO. The x = 0.3 sample was found to be a canonical spin glass. To investigate the role of the above spin ordering in Y Tb MnO in governing the phonon dynamics, temperature dependent Raman measurements were carried out. We observed the deviation of the phonon frequency near 685 cm and its line-width from the expected anharmonic behaviour around magnetic ordering temperature for Tb substituted compounds with x = 0.1 and 0.2. This was attributed to the spin-phonon coupling in these systems. The anomalous behaviour of this phonon mode in the canonical spin glass compound with x = 0.3, indicated that the coupling sustained even in the presence of only local magnetic ordering.

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Research progress of two-dimensional magnetic materials

Dai

Luo

et al. 2023

Sci. China Mater.

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Magnetic ordering: Neutron diffraction and depolarization studies at Dhruva Reactor

Cited by 10 publications

References 21 publications

Size induced magnetic phases in half doped manganite nanowires of La_0.5Sr_0.5MnO₃: a neutron diffraction study

Size induced magnetic phases in half doped manganite nanowires of La_0.5Sr_0.5MnO₃: a neutron diffraction study

Revealing magnetic ordering and spin-phonon coupling in Y_1−xTb_xMnO₃ (0.1 ⩽ x ⩽ 0.3) compounds

Research progress of two-dimensional magnetic materials

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Magnetic ordering: Neutron diffraction and depolarization studies at Dhruva Reactor

Cited by 10 publications

References 21 publications

Size induced magnetic phases in half doped manganite nanowires of La0.5Sr0.5MnO3: a neutron diffraction study

Size induced magnetic phases in half doped manganite nanowires of La0.5Sr0.5MnO3: a neutron diffraction study

Revealing magnetic ordering and spin-phonon coupling in Y1−x Tb x MnO3 (0.1 ⩽ x ⩽ 0.3) compounds

Research progress of two-dimensional magnetic materials

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Size induced magnetic phases in half doped manganite nanowires of La_0.5Sr_0.5MnO₃: a neutron diffraction study

Size induced magnetic phases in half doped manganite nanowires of La_0.5Sr_0.5MnO₃: a neutron diffraction study

Revealing magnetic ordering and spin-phonon coupling in Y_1−xTb_xMnO₃ (0.1 ⩽ x ⩽ 0.3) compounds