CYCLOPS – a reciprocal-space explorer based on CCD neutron detectors

Ouladdiaf, B.; Archer, J.; Allibon, J.; Decarpentrie, Philippe; Lemée-Cailleau, Marie–Hélène; Rodrı́guez-Carvajal, J.; Hewat, A.W.; York, Scott; Brau, Daniel; McIntyre, Garry J.

doi:10.1107/s0021889811006765

Cited by 38 publications

(19 citation statements)

References 17 publications

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“…Neutron diffraction experiments were performed on the CYCLOPS and D23 diffractometers at the Institut Laue Langevin using a standard cryostats capable of reaching temperatures down to 1.7 K [33]. The recently constructed CYCLOPS is a Laue-technique neutron instrument that uses an array of CCD cameras and a large range of incident neutron wavelengths.…”

Section: Physical Propertiesmentioning

confidence: 99%

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Structural inhomogeneities in FeTe0.6Se0.4: Relation to superconductivity

Prokeš

Schulze

Hartwig

et al. 2015

Journal of Crystal Growth

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Chemical and structural phase compositions of two single-crystalline samples prepared with different cooling rates from stoichiometric FeTe 0.6 Se 0.4 melts were studied. Both types of samples were investigated in a very comprehensive way using magnetic and electrical transport measurements combined with X-ray, neutron and electron backscatter diffraction. We show that slowly cooled samples are homogeneous on a microscopic scale with only a small excess of iron. Those slowly cooled samples do not exhibit bulk superconductivity down to 1.8 K. In contrast, fast-cooled samples are superconducting below about 14 K but are composed of several chemical phases: They consist of a matrix preserving the crystal structure of slow-cooled samples, and of core-shell structured dendritic inclusions (about 20-30 vol.%). These have different crystal structure and chemical composition and order magnetically at temperatures far above the superconducting transition temperature of the inhomogeneous samples. These structural and chemical inhomogeneities seem to play a vital role in the superconducting properties of this and similar iron-based systems as they lead to internal stress and act in a similar way as the application of the external pressure that reportedly increase the superconducting transition temperature in many iron pnictides and chalcogenides. We argue that a phase pure, homogeneous and stress-free FeTe 0.6 Se 0.4 is non-superconducting.

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Section: Physical Propertiesmentioning

confidence: 99%

“…% [16] but has also been reported to be on the order of up to 8% for a Fe 1.08 Te 0.67 Se 0. 33 sample with a T c of 14 K [21].…”

Section: Introductionmentioning

confidence: 99%

Structural inhomogeneities in FeTe0.6Se0.4: Relation to superconductivity

Prokeš

Schulze

Hartwig

et al. 2015

Journal of Crystal Growth

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“…instrument also at ILL [46]. Laue patterns were collected in the paramagnetic (8 K) and in the antiferromagnetic (1.5 K) state.…”

Section: Methodsmentioning

confidence: 99%

Magnetic structures of non-cerium analogues of heavy-fermionCe2RhIn8: The case ofNd2
Čermák
¹
,
Javorský
²
,
Kratochvílová
³

et al. 2014
Phys. Rev. B
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R 2 RhIn 8 compounds (space group P 4/mmm, R is a rare-earth element) belong to a large group of structurally related tetragonal materials which involves several heavy-fermion superconductors based on Ce. We have succeeded in growing single crystals of compounds with Nd, Dy, and Er, and following our previous bulk measurements, we performed neutron-diffraction studies to determine their magnetic structures. The Laue diffraction experiment showed that the antiferromagnetic order below the Néel temperature is in all three compounds characterized by the propagation vector k = (1/2,1/2,1/2). The amplitude and direction of the magnetic moments, as well as the invariance symmetry of the magnetic structure, were determined by subsequent experiments using two-and four-circle diffractometers. The critical exponents were determined from the temperature dependence of the intensities below T N .

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“…Again, through an iterative process of considering what science we wanted to do, with what was possible logistically, technically and within budget, the Laue instrument began to take shape. The only other instrument of this type is CYCLOPS [2] at the ILL. Although Orient Express, ILL [3] and JOEY, AN-STO [4] make use of photonic science scintillator/CCD technology, they are primarily used for orienting crystals and not for full scientifi c investigations.…”

Section: Year 1: Designmentioning

confidence: 99%