Effect of the Strong Field on the Magnitude of the Bohr Magneton.

2005 ◽  
Vol 18 (3) ◽  
pp. 309-314
Author(s):  
Abdul L. Bhuiyan
Keyword(s):  
Strong Field ◽  
Bohr Magneton

A New Method for the Measurement of the Bohr Magneton

1937 ◽  
Vol 51 (10) ◽  
pp. 852-854 ◽  
Author(s):  
Otto Stern
Keyword(s):  
New Method ◽  
Bohr Magneton

scholarly journals Long-range ordered magnetic structures in Li2MnSiO4and Li2CoSiO4

2014 ◽  
Vol 70 (a1) ◽  
pp. C1365-C1365
Author(s):  
Zakiah Mohamed ◽  
Maxim Avdeev ◽  
Chris Ling
Keyword(s):  
Powder Diffraction ◽  
Magnetic Moments ◽  
Transition Metal Ions ◽  
Neutron Powder Diffraction ◽  
X Ray ◽  
Magnetic Structures ◽  
Bohr Magneton ◽  
Dark Green ◽  
First Time ◽  
Magnetic Sublattices

The lithium orthosilicates Li2MnSiO4 and Li2CoSiO4 have been synthesized by solid state reaction and characterized using X-ray powder diffraction (XRD), magnetic susceptibility measurement, heat capacity and neutron powder diffraction (NPD). The monoclinic Li2MnSiO4 and orthorhombic Li2CoSiO4 compound were found to be antiferromagnetically ordered below Neel temperature = ~12 K and ~13 K respectively. The ordered magnetic structures of both compounds have been solved for the first time using low temperature neutron diffraction data. The magnetic structure of Li2CoSiO4 can be described as antiferromagnetic quasi-layers stacked along the a-axis. The ordered magnetic moments of the Co2+ and Mn2+ are aligned perpendicularly and obliquely to the distorted closed-packed layers of oxygen atoms and the values, 2.9 bohr magneton and 4.6 Bohr magneton, are close to the expected values for d7 Co2+ and d5 Mn2+, respectively. The origin of these complex magnetic structures will be discussed in terms of super-superexchange interactions among the transition metal ions, mediated by bridging SiO4 tetrahedra. Figure 1: Magnetic sublattices in Li2CoSiO4 (left) and Li2MnSiO4 (right) with respect to crystal structure. Blue, yellow, and light and dark green show the M, Si, and Li1 and Li2 sites in Pbn21 Li2CoSiO4 and P21/n Li2MnSiO4.

An Attempt to Detect the Neutrino

1935 ◽  
Vol 31 (1) ◽  
pp. 99-107 ◽  
Author(s):  
M. E. Nahmias
Keyword(s):  
High Pressure ◽  
Magnetic Moment ◽  
Ionization Chamber ◽  
Solid Angle ◽  
Total Solid ◽  
Effective Length ◽  
Single Pair ◽  
Wave Mechanics ◽  
Bohr Magneton ◽  
Total Solid Angle

It has been shown by Chadwick and Lee(1), using a high-pressure ionization chamber, that if one neutrino is emitted by each disintegrating Ra E nucleus, then the neutrinos do not produce more than one pair of ions in 150 km. of air at N.T.P. Calculations based on the wave mechanics show that the ionization due to a neutrino having a magnetic moment of one Bohr magneton would be very easily detectable(2), whereas it has peen estimated that if the neutrino has no magnetic moment at all its encounters with nuclei will be as scarce as one in 1016 km. of water(3). I have investigated the matter again, using two Geiger-Müller counters, instead of an ionization chamber. The counters have the advantage of giving a discharge for a single pair of ions(4). The two counters of 15×5cm. were connected in parallel, and filled with air at 76mm. pressure. They were shielded on all sides by 45 mm. of lead. A source of 7 mg. of Ra (D, E, F) was placed at a distance of 11 cm. from the centres of the two counters, so that the total solid angle subtended by the counters at the source was 0·10, expressed as a fraction of the complete sphere. Assuming that both the disintegrating atoms of Ra D and Ra E give one neutrino, then the number of neutrinos crossing the counters per minute is 3·1 × 109. The average effective length of the path in the counter, reduced to N.T.P., is 0·3 cm., so in one min. the total range in air of all the neutrinos crossing the counters is 9·3 × 108 cm.

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