E4
2-Axis-Diffractometer
Instrument description
The instrument is primarily suited for magnetic structure determination under various conditions, which includes magnetic fields up to 17 T, temperatures down to 30 mK and pressures up to 10 kbar. The most common application is to reveal spatial arrangement ordered spin structures. Using the polarized neutrons option facilitates the separation of magnetic contributions from nuclear scattering. The measurement of flipping ratios allows registration of very weak magnetic scattering and the mapping of spin density distributions.
The monochromator shielding contains three beam channels at 2ΘM = 20°, 42.5° and 65° with the instrument installed at 2ΘM = 42.5° most of the time. This position corresponds to the incident wavelength of 0.244 nm.
The additional option of polarized neutrons uses a super mirror bender and a π-flipper. The instrument runs under the system CARESS; automatic control of temperature and magnetic field is provided.
Applications
- Magnetic structure determination
- Study of magnetic and structural phase transitions
- Determination of magnetic phase diagrams
- Study of critical points as a function of magnetic field and temperature
- Measurement of correlation functions above the ordering temperature
Instrument layout
| Instrument Data | |
|---|---|
| Beam tube | R 2 |
| Collimation | automatic change of α1 = 20’, 40’, open geometrical divergence: 60’ manual variation of α2 = 10', 20' or 40' and α3 (Soller or oscillating radial) |
| Monochromator | PG (002) with variable vertical curvature Ge (113) double focusing |
| Take off angle of monochromator | 2ΘM = 20°, 42.5°, 65°, permanently installed at 42.5° |
| Wave length | λ=0.244 nm (PG) or 1.2 (Ge) |
| Flux | 0.8·106 n/cm2s (PG) 0.6·106 n/cm2s (Ge) 0.3·106 n/cm2s polarized (PG+bender) |
| Range of scattering angles | 0° ≤ 2Θ ≤ 120° (with configurational restrictions related to sample environment) |
| Angle resolution | depends on setting |
| Range of lattice spacing | 2 - 60 A |
| d resolution | |
| Sample size | from 1mm^3 for topic-focused studies |
| Detector | 2D detector 200x200mm^2, variable distance (640-900 mm) |
| Polarized neutrons | yes (super mirror bender) please contact the instrument scientist to discuss in advance |
| Instrument options | polarization analysis (super mirror analysis) |
| Sample environment | • horizontal magnetic field < 6 T • vertical magnetic field < 17 T • temperature range 0.03 - 600 K • hydrostatic pressure 0 - 10 kbar • 4-circle mode |
| Software | CARESS, BEAN, set of supporting programs to deal with 2D data |
Additional information
Ausgewähle Veröffentlichungen
Phase diagram with an enhanced spin-glass region of the mixed Ising-XY magnet LiHoxEr1-xF4
Piatek, J.O.; Dalla Piazza, B.; Nikseresht, N.; Tsyrulin, N.; Zivkovic, I.; Krämer, K.W.; Laver, M.; Prokes, K.; Matas, S.; Christensen, N.B.; Ronnow, H.M.:,
Physical Review B 88, (2013) 014408
Neutron study of the magnetism in NiCl2•4SC(NH2)2
Tsyrulin, N.; Batista, C.D.; Zapf, V.S.; Jaime, M.; Hansen, B.R.; Niedermayer, C.; Rule, K.C.; Habicht, K.; Prokes, K.; Kiefer, K.; Ressouche, E.; Paduan-Filho, A.; Kenzelmann, M.:,
Journal of Physics: Condensed Matter 25, (2013) 216008
Solitonic lattice and Yukawa forces in the rare-earth orthoferrite TbFeO3
Artyukhin, S.; Mostovoy, M.; Jensen, N.P.; Le, D.; Prokes, K.; de Paula, V.G.; Bordallo, H.N.; Maljuk, A.; Landsgesell, S.; Ryll, H.; Klemke, B.; Paeckel, S.; Kiefer, K.; Lefmann, K.; Kuhn, L.T.; Argyriou, D.N.:
Nature Materials 11, (2012) 694
Dipolar Antiferromagnetism and Quantum Criticality in LiErF4
Kraemer, C,; Nikseresht, N.; Piatek, J.O.; Tsyrulin, N.; Dalla Piazza, B.; Kiefer, K.; Klemke, B.; Rosenbaum, T.F.; Aeppli, G.; Gannarelli, C.; Prokeš, K.; Podlesnyak, A. Strassle, T. Keller, L.; Zaharko, O.; Kramer, K.W.; Ronnow, H.M.;,
Science 236, (2012) 1416
From ( π , 0) magnetic order to superconductivity with (π, π ) magnetic resonance in Fe1.02(Te1-xSex)
Liu, T. J.; Hu, J.; Qian, B.; Fobes, D.; Mao, Z. Q.; Bao, W.; Reehuis, M.; Kimber, S. A. J.; Prokeš, K.; Mat'aš, S.; Argyriou, D. N.; Hiess, A.; Rotaru, A.; Pham, H.; Spinu, L.; Qiu , Y.; Thampy, V.; Savici, A. T.; Rodriguez, J. A.; Broholm, C.;
Nature Materials 9, (2010) 716