Mn-3d orbital state in colossal materials La2-2xSr1+2xMn2O7
Inquiry number
SOL-0000001168
Beamline
BL08W (High Energy Inelastic Scattering)
Scientific keywords
| A. Sample category | inorganic material |
|---|---|
| B. Sample category (detail) | magnetic material, solid-state crystal |
| C. Technique | inelastic scattering |
| D. Technique (detail) | magnetic scattering, Compton scattering |
| E. Particular condition | polarization (circular), low-T (~ liquid He), magnetic field (> 2 T) |
| F. Photon energy | X-ray (> 40 keV) |
| G. Target information | electronic state, spin/magnetism |
Industrial keywords
| level 1---Application area | storage device |
|---|---|
| level 2---Target | HD,MO |
| level 3---Target (detail) | magnetic layer, magnetic head |
| level 4---Obtainable information | electronic state, magnetic moment, magnetic anisotropy |
| level 5---Technique | magnetic scattering, magnetic Compton scattering, PEEM |
Classification
A80.14 magnetic materials, M25.10 magnetic scattering
Body text
Magnetic Compton scattering is a unique technique to investigate ferro- and ferrimagnetic compounds. Using this technique, one can measure a magnetic Compton profile (MCP) in the magnetic compounds. When the MCP can be decomposed into a few partial profiles with the characteristic shape of a specific electronic state, the area under the partial profile gives the partial spin moment associated with that state. The figure shows the MCP's of La2-2xSr1+2xMn2O7. The result can explain the complicate magnetic phase diagram of this compound.
Fig. The magnetic Compton profiles along the [100], [110] and [001] directions in La2-2xSr 1+2xMn2O7 with x = 0.35. Experimental data (solid circles) are shown with fit (solid gray line) using the MnO6 cluster orbitals. Also shown are the t2g orbital (dotted green line), x2-y2 orbital (dashed red line) and 3z2-r2 orbital (dash-dotted blue line) contributions.
[ A. Koizumi, S. Miyaki, Y. Kakutani, H. Koizumi, N. Hiraoka, K. Makoshi, N. Skai, K. Hirota and Y. Murakami, Physical Review Letters 86, 5589-5592 (2001), Fig. 1 left,
©2001 American Physical Society ]
Source of the figure
Beamline Report
Page
29
Technique
When the incident x-rays are circularly polarized, the scattering cross-section contains a spin-dependent term. The experimental extraction of the spin dependence results in a magnetic Compton profile (MCP), Jmag(pz), that is defined as the one-dimensional projection of the spin-polarized electron momentum distribution. The area under the MCP is equal to the total spin moment (μspin) per formula unit.
where n↑(p) and n↓(p) are the momentum densities of the majority and minority spin bands, respectively.
Source of the figure
No figure
Required time for experimental setup
4 hour(s)
Instruments
| Instrument | Purpose | Performance |
|---|---|---|
| Magnetic Compton Scattering Spectrometer | Magnetic Compton measurement | momentum resolution 0.5 atomic unit |
References
| Document name |
|---|
| A. Koizumi, et. al. , Phys. Rev. Lett. 86 (2001) 5589. |
Related experimental techniques
XMCD
Questionnaire
The measurement was possible only in SPring-8. Impossible or very difficult in other facilities.
This solution is an application of a main instrument of the beamline.
Similar experiments account for more than 30% of the beamline's subject.
Ease of measurement
Easy
Ease of analysis
Middle
How many shifts were needed for taking whole data in the figure?
More than ten shifts