Calculations of hyperfine fields

Lindgren, B.

doi:10.1007/bf02405149

Cited by 8 publications

(38 citation statements)

References 25 publications

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“…The modified channel of cryostat had the high-pressure chamber of piston-cylinder type [30], capable of generating a sample pressure of 2 GPa. The hyperfine interaction parameters were extracted from the measured perturbation functions A 22 G 22 (t) using the DEPACK program developed by Lindgren [31]. Magnetic ac-susceptibility was measured in piston-cylinder type pressure chamber [30] in the sample which was used for TDPAC measurements.…”

Section: Methodsmentioning

confidence: 99%

Hyperfine field assessment of the magnetic structure ofZrZn2

et al. 2015

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Time differential perturbed angular γγ-correlation (TDPAC) method on 111 Cd nuclei probes inserted in ZrZn1.9 is used to measure the magnetic hyperfine fields (MHFs) at Zr and Zn sites and the electric field gradient (EFG) Vzz at Zn sites as a function of temperature at various pressures and as a function of pressure at the temperature 4 K. Our data indicate that the local magnetic moment of Zr in the magnetically ordered state is substantially larger than its value obtained from the macroscopic measurements and that there is also an induced magnetic moment at the Zn site. We conclude that ZrZn2 is not a simple ferromagnet and discuss a possible type of its magnetic ordering.

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Section: Methodsmentioning

confidence: 99%

Hyperfine field assessment of the magnetic structure ofZrZn2

et al. 2015

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“…Further details of the spectrometer and data acquisition have been reported [28,29]. The time-dependent anisotropy function R(t) [30] is analysed with the following expression for extraction of hyperfine interaction parameters, i.e.…”

Section: Methodsmentioning

confidence: 99%

Studies of local structure at Zr sites in pressure amorphized zirconium tungstate

Govindaraj

Sundar²,

Arora

2009

J. Phys.: Condens. Matter

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Amorphous to crystalline transition in pressure quenched Zr(0.5)Hf(0.5)W(2)O(8) has been studied with respect to local structures of ZrO(6) using the perturbed angular correlation technique. In an untreated crystalline sample close to 0.7 fraction of the probe atoms occupy Zr sites of regular ZrO(6) while the remaining three fractions are understood to be associated with contracted and distorted octahedra. The existence of six distinct ZrO(6) could be deduced based on perturbed angular correlation studies in the pressure amorphized sample. In the amorphous sample these ZrO(6) are associated with appreciable octahedral distortions. Isochronal annealing measurements show that these octahedra remain structurally quite stable up to 800 K. Values of quadrupole frequencies tend to become close to those experienced by probe atoms in a crystalline sample for annealing at 870 K, implying that around this temperature there is an onset of amorphous to crystalline transition. Complete restoration of quadrupole parameters to those of the untreated crystalline sample is seen subsequent to annealing at 975 K.

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“…The deduced quadrupole parameters are quadrupole frequency ν Q = eQV zz / h and asymmetry parameter η = (V xx − V yy )/V zz , where V xx , V yy and V zz are the elements of the EFG tensor in its principal axis system. This analysis [18] also provides information on the fractions, f i , of probe nuclei experiencing hyperfine frequencies, the angle β between B hf and V zz , and the width of the Lorentzian distribution of quadrupole frequencies, δ. Figure 1 shows a few representative anisotropy spectra and their Fourier transform for measurements carried out at different temperatures in LSMO.…”

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Competing magnetic phases in La_0.7Sr_0.3MnO₃as deduced from Mn site hyperfine parameters

Govindaraj

Sundar

2006

J. Phys.: Condens. Matter

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Time differential perturbed angular correlation measurements using the (181)Ta probe in La(0.7)Sr(0.3)Mn(0.995)Hf(0.005)O(3) reveal the presence of two distinct hyperfine components, identified with probe atoms occupying Mn sites which are rich and deficient in hole concentration. The Mn(4+) rich zones exhibit ferromagnetic ordering at all temperatures below 360 K, the bulk Curie temperature. In the case of Mn(4+) deficient zones, the paramagnetic order is seen to evolve into a canted antiferromagnetic ordering below 360 K, that becomes ferromagnetic below 250 K. Concomitantly, there is a change in the fractions below 250 K. The implications of these results are discussed in terms of electronic phase separation.

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Calculations of hyperfine fields

Cited by 8 publications

References 25 publications

Hyperfine field assessment of the magnetic structure ofZrZn2

Hyperfine field assessment of the magnetic structure ofZrZn2

Studies of local structure at Zr sites in pressure amorphized zirconium tungstate

Competing magnetic phases in La_0.7Sr_0.3MnO₃as deduced from Mn site hyperfine parameters

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Calculations of hyperfine fields

Cited by 8 publications

References 25 publications

Hyperfine field assessment of the magnetic structure ofZrZn2

Hyperfine field assessment of the magnetic structure ofZrZn2

Studies of local structure at Zr sites in pressure amorphized zirconium tungstate

Competing magnetic phases in La0.7Sr0.3MnO3as deduced from Mn site hyperfine parameters

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Competing magnetic phases in La_0.7Sr_0.3MnO₃as deduced from Mn site hyperfine parameters