Single-crystal diffraction instrument TriCS at SINQ

Schefer, J.; Könnecke, Mark; Murasik, A.; Czopnik, A.; Strässle, Th.; Keller, P.; Schlumpf, N.

doi:10.1016/s0921-4526(99)01308-3

Cited by 41 publications

(33 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All crystals were platelike with dimensions up to 5 × 5 × 1 mm 3 with the c axis perpendicular to their surfaces. The neutron diffraction measurements were performed on the hot-neutron four-circle diffractometer HEiDi 28 and the diffuse scattering cold-neutron spectrometer DNS 29 at the Heinz Maier-Leibnitz Zentrum (Garching, Germany), the thermal-neutron four-circle diffractometer TriCS 30 at Paul Scherrer Institute (Villigen, Switzerland), and thermal-neutron two-axis diffractometer D23 at Institut Laue Langevin (Grenoble, France), respectively. The experimental conditions for different compositions are summarized in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Phase diagram of Eu magnetic ordering in Sn-flux-grown Eu(Fe1−xCox)2As
Jin
¹
,
Xiao
²
,
Bukowski
³

et al. 2016
Phys. Rev. B
29
2
46
0
View full text Add to dashboard Cite

The magnetic ground state of the Eu 2+ moments in a series of Eu(Fe1−xCox)2As2 single crystals grown from the Sn flux has been investigated in detail by neutron diffraction measurements. Combined with the results from the macroscopic properties (resistivity, magnetic susceptibility and specific heat) measurements, a phase diagram describing how the Eu magnetic order evolves with Co doping in Eu(Fe1−xCox)2As2 is established. The ground-state magnetic structure of the Eu 2+ spins is found to develop from the A-type antiferromagnetic (AFM) order in the parent compound, via the A-type canted AFM structure with some net ferromagnetic (FM) moment component along the crystallographic c direction at intermediate Co doping levels, finally to the pure FM order at relatively high Co doping levels. The ordering temperature of Eu declines linearly at first, reaches the minimum value of 16.5(2) K around x = 0.100(4), and then reverses upwards with further Co doping. The doping-induced modification of the indirect Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between the Eu 2+ moments, which is mediated by the conduction d electrons on the (Fe,Co)As layers, as well as the change of the strength of the direct interaction between the Eu 2+ and Fe 2+ moments, might be responsible for the change of the magnetic ground state and the ordering temperature of the Eu sublattice. In addition, for Eu(Fe1−xCox)2As2 single crystals with 0.10 x 0.18, strong ferromagnetism from the Eu sublattice is well developed in the superconducting state, where a spontaneous vortex state is expected to account for the compromise between the two competing phenomena.

show abstract

Section: Methodsmentioning

confidence: 99%

Phase diagram of Eu magnetic ordering in Sn-flux-grown Eu(Fe1−xCox)2As
Jin
¹
,
Xiao
²
,
Bukowski
³

et al. 2016
Phys. Rev. B
29
2
46
0
View full text Add to dashboard Cite

show abstract

“…The measurements were performed on a single-crystal diffractometer (TriCS) [4] at the Swiss Spallation Source SINQ [5] of the Paul Scherer Institute in Villigen using a single detector. The refinement has been performed using the computer program JANA2006 [6].…”

Section: Circular Salt Crystalsmentioning

confidence: 99%

“…Experimental data collection parameters of the 4-circle neutron diffractometer TriCS[4] at the Swiss Neutron Spallation Source SINQ and refinement parameters for an ISS-grown NaCl obtained with the JANA2006[6] software package.…”

mentioning

confidence: 99%

Characterization of sodium chloride crystals grown in microgravity

Fontana¹,

Schefer²,

Pettit³

2011

Journal of Crystal Growth

View full text Add to dashboard Cite

“…[22]. For this work, the sample was reannealed in oxygen, and the SXD (ISIS, United Kingdom) [23] and TRiCS (PSI, Switzerland) [24] diffractometers used to confirm no structural diffuse scattering, indicative of oxygen defect clusters [12], was present [25]. Magnetic diffuse neutron scattering experiments were performed on the WISH (ISIS) [26] and DMC (PSI) [27] diffractometers (our procedures for data normalization for the two instruments are described in Ref.…”

mentioning

confidence: 99%

Pauling Entropy, Metastability, and Equilibrium in Dy2Ti2O7
Giblin
¹
,
Twengström
²
,
Bovo
³

et al. 2018
Phys. Rev. Lett.
36
10
23
0
View full text Add to dashboard Cite

Determining the fate of the Pauling entropy in the classical spin ice material Dy 2 Ti 2 O 7 with respect to the third law of thermodynamics has become an important test case for understanding the existence and stability of ice-rule states in general. The standard model of spin ice-the dipolar spin ice model-predicts an ordering transition at T ≈ 0.15 K, but recent experiments by Pomaranski et al. suggest an entropy recovery over long timescales at temperatures as high as 0.5 K, much too high to be compatible with the theory. Using neutron scattering and specific heat measurements at low temperatures and with long timescales (0.35 K=10 6 s and 0.5 K=10 5 s, respectively) on several isotopically enriched samples, we find no evidence of a reduction of ice-rule correlations or spin entropy. High-resolution simulations of the neutron structure factor show that the spin correlations remain well described by the dipolar spin ice model at all temperatures. Furthermore, by careful consideration of hyperfine contributions, we conclude that the original entropy measurements of Ramirez et al. are, after all, essentially correct: The short-time relaxation method used in that study gives a reasonably accurate estimate of the equilibrium spin ice entropy due to a cancellation of contributions. DOI: 10.1103/PhysRevLett.121.067202 The properties of ice-rule states, such as water ice [1,2] and spin ice [3][4][5], provide a strong contrast with the conventional paradigm of condensed matter. Instead of broken symmetry, entropy that vanishes in accord with the third law, exponentially decaying correlations, and wavelike excitations, one finds Coulomb phase correlations [6], finite entropy [1,5], and pointlike fractional excitations (monopoles) [7,8]. The mapping between the hydrogen bonding network and spin configurations [4,9] and the resultant identical residual (Pauling) entropy [5] are cornerstones of spin ice physics, posing fundamental questions including how a realistic Hamiltonian can lead to practical evasion of the third law, and whether the entropic state is metastable. Because the low-temperature dynamics of spin ice depends on a vanishing number of thermally excited monopoles, relaxation becomes slow at low temperatures [2,10], and sensitivity to sample variations is enhanced [11,12]; both effects may mask the true equilibrium state. While the third law ground state of water ice can be accessed by doping that increases dynamics [9], the fate of the residual entropy in the spin ice Dy 2 Ti 2 O 7 [5] is unknown. Because of these experimental challenges, the problem of third law ordering in ice-type systems may best be addressed by a careful collaboration of experiment and theory, designed to accurately model the system and extrapolate properties beyond the experimental range.The spin ice state of Dy 2 Ti 2 O 7 [3-5] is a consequence of frustration arising from the competition between the Isinglike crystal field anisotropy [13,14], exchange, and dipolar interactions [15,16]. These ingredients can be described by a clas...

show abstract

Single-crystal diffraction instrument TriCS at SINQ

Cited by 41 publications

References 2 publications

Phase diagram of Eu magnetic ordering in Sn-flux-grown Eu(Fe1−xCox)2As
Jin
¹
,
Xiao
²
,
Bukowski
³

et al. 2016
Phys. Rev. B
29
2
46
0
View full text Add to dashboard Cite

Phase diagram of Eu magnetic ordering in Sn-flux-grown Eu(Fe1−xCox)2As
Jin
¹
,
Xiao
²
,
Bukowski
³

et al. 2016
Phys. Rev. B
29
2
46
0
View full text Add to dashboard Cite

Characterization of sodium chloride crystals grown in microgravity

Pauling Entropy, Metastability, and Equilibrium in Dy2Ti2O7
Giblin
¹
,
Twengström
²
,
Bovo
³

et al. 2018
Phys. Rev. Lett.
36
10
23
0
View full text Add to dashboard Cite

Contact Info

Product

Resources

About

Single-crystal diffraction instrument TriCS at SINQ

Cited by 41 publications

References 2 publications

Phase diagram of Eu magnetic ordering in Sn-flux-grown Eu(Fe1−xCox)2AsJin1, Xiao2, Bukowski3 et al. 2016Phys. Rev. B292460View full textAdd to dashboardCite

Phase diagram of Eu magnetic ordering in Sn-flux-grown Eu(Fe1−xCox)2AsJin1, Xiao2, Bukowski3 et al. 2016Phys. Rev. B292460View full textAdd to dashboardCite

Characterization of sodium chloride crystals grown in microgravity

Pauling Entropy, Metastability, and Equilibrium in Dy2Ti2O7Giblin1, Twengström2, Bovo3 et al. 2018Phys. Rev. Lett.3610230View full textAdd to dashboardCite

Contact Info

Product

Resources

About

Phase diagram of Eu magnetic ordering in Sn-flux-grown Eu(Fe1−xCox)2As
Jin
¹
,
Xiao
²
,
Bukowski
³

et al. 2016
Phys. Rev. B
29
2
46
0
View full text Add to dashboard Cite

Phase diagram of Eu magnetic ordering in Sn-flux-grown Eu(Fe1−xCox)2As
Jin
¹
,
Xiao
²
,
Bukowski
³

et al. 2016
Phys. Rev. B
29
2
46
0
View full text Add to dashboard Cite

Pauling Entropy, Metastability, and Equilibrium in Dy2Ti2O7
Giblin
¹
,
Twengström
²
,
Bovo
³

et al. 2018
Phys. Rev. Lett.
36
10
23
0
View full text Add to dashboard Cite