SPring-8, the large synchrotron radiation facility

Inquiry number

SOL-0000001024

Beamline

BL22XU (JAEA Actinide Science I)

Scientific keywords

A. Sample category	inorganic material, research on method, instrumentation
B. Sample category (detail)	magnetic material, solid-state crystal
C. Technique	X-ray diffraction, absorption and its secondary process
D. Technique (detail)	single crystal, magnetic scattering, XANES
E. Particular condition	polarization (linear), low-T (~ liquid He), magnetic field (> 2 T), time-resolved (ms)
F. Photon energy	X-ray (4-40 keV)
G. Target information	chemical state, crystal structure, structural change, spin/magnetism, phase transition

Industrial keywords

level 1---Application area	storage device
level 2---Target	HD,MO
level 3---Target (detail)	magnetic layer
level 4---Obtainable information	crystal structure, electronic state, magnetic moment, valence
level 5---Technique	diffraction, NEXAFS

Classification

A80.14 magnetic materials, A80.30 inorganic material, M10.10 single crystal diffraction, M25.10 magnetic scattering, M40.10 XAFS

Body text

A pulsed magnet enables x-ray diffraction experiments under strong magnetic fields above 15 Tesla, which cannot be achieved by using a super-conducting magnet. One can observe the order parameters in phase transitions under very high magnetic fields from a structural point of view using this method.
The pulse duration of magnetic fields is about 1 msec. X-ray diffraction experiments up to 33 Tesla are available now.
In the figure, the field-induced valence-transition of YbInCu₄ is shown. The 200 Bragg diffraction peak moves toward high angle above 26T, and this indicates that reduction of the lattice volume, which accompanies the valence transition.
Utilizing this pulsed magnet, we also performed x-ray absorption experiments up to 41T.

Figure -2 profiles of the 200 Bragg peak of YbInCu4 as a function of magnetic field

[ T. Inami, K. Ohawada, Y. Matsuda, Y. Ueda, H. Nojiri, Y. Murakami, T. Arima, H. Ohta, W. Zhang and K. Yoshimura, Nuclear Instruments and Methods in Physics Research B 238, 233-236 (2005), Fig. 2,
©2005 Elsevier Science Publisher ]

Source of the figure

Private communication/others

Description

Technique

We use very small pulsed magnets. The typical dimensions are 2cm in diameter, 2cm in length, and 3mm in bore diameter. It is possible to cool the magnet by a conventional closed-cycle He refrigerator, since the magnet is small and produces little heat. Hence we can perform x-ray diffraction experiments without introducing any modification to the diffractometer.

Figure A pulsed magnet mounted on the cold head of a closed-cycle He refrigerator

[ Journal of the Crystallographic Society of Japan 47, 244 (2005), Fig. 5,
©2005 The Crystallographic Society of Japan ]

Source of the figure

Private communication/others

Description

Required time for experimental setup

24 hour(s)

Instruments

Instrument	Purpose	Performance
Experimental hutch 3	X-ray diffraction under strong magnetic fields	30T

References

Document name
Y. H. Matsuda et al., Physica B, 346-347, 519-523 (2004)
T. Inami et al., NIMB in press (2005).

Related experimental techniques

Questionnaire

This solution is an application of a main instrument of the beamline.
With user's own instruments.

Ease of measurement

Middle

Ease of analysis

Easy

How many shifts were needed for taking whole data in the figure?

Two-three shifts