Development of a Hybrid CuBe/NiCrAl Clamp-Type High Pressure Cell for Neutron Diffraction

Aso, Naofumi; Fujiwara, T.; Uwatoko, Yoshiya; Miyano, H.; Yoshizawa, H.

doi:10.1143/jpsjs.76sa.228

Cited by 10 publications

(3 citation statements)

References 9 publications

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“…Pressure was applied at room temperature using a hybrid CuBe/NiCrAl piston-cylinder-type high pressure clamp cell [38,39]. Daphne 7373 was chosen as the pressure transmitting medium.…”

Section: Methodsmentioning

confidence: 99%

Pressure dependence of coherence-incoherence crossover behavior in KFe2As2 observed by resistivity and As75 -NMR/NQR

et al. 2018

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We present the results of 75 As nuclear magnetic resonance (NMR), nuclear quadrupole resonance (NQR), and resistivity measurements in KFe2As2 under pressure (p). The temperature dependence of the NMR shift, nuclear spin-lattice relaxation time (T1) and resistivity show a crossover between a high-temperature incoherent, local-moment behavior and a low-temperature coherent behavior at a crossover temperature (T * ). T * is found to increase monotonically with pressure, consistent with increasing hybridization between localized 3d orbital-derived bands with the itinerant electron bands. No anomaly in T * is seen at the critical pressure pc = 1.8 GPa where a change of slope of the superconducting (SC) transition temperature Tc(p) has been observed. In contrast, Tc(p) seems to correlate with antiferromagnetic spin fluctuations in the normal state as measured by the NQR 1/T1 data, although such a correlation cannot be seen in the replacement effects of A in the AFe2As2 (A= K, Rb, Cs) family. In the superconducting state, two T1 components are observed at low temperatures, suggesting the existence of two distinct local electronic environments. The temperature dependence of the short T1s indicates nearly gapless state below Tc. On the other hand, the temperature dependence of the long component 1/T1L implies a large reduction in the density of states at the Fermi level due to the SC gap formation. These results suggest a real-space modulation of the local SC gap structure in KFe2As2 under pressure.Recent NMR measurements have pointed out a possible d-electron heavy fermion behavior in the AFe 2 As 2

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“…Pressure was applied at room temperature using a hybrid CuBe/NiCrAl piston-cylinder-type high pressure clamp cell [38,39]. Daphne 7373 was chosen as the pressure transmitting medium.…”

Section: Methodsmentioning

confidence: 99%

Pressure dependence of coherence-incoherence crossover behavior in KFe2As2 observed by resistivity and As75 -NMR/NQR

et al. 2018

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“…High-resolution neutron powder diffraction (NPD) and magnetic field NPD of Ho 2 Fe 17 and Ho 2 Fe 16.5 Al 0.5 were obtained at ECHIDNA of the Australian Nuclear Science and Technology Organization (λ = 1.6215 Å) from 3 to 650 K. High-pressure NPD experiments were carried out at PLANET of J-PARC up to 300 K from 0 to +2.0(1) GPa (see the Supporting Information for details). 20 All the diffraction data was refined by Rietveld methods using FULLPROF package. 21 Magnetization Experiments.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Pressure-Modulated Magnetism and Negative Thermal Expansion in the Ho₂Fe₁₇ Intermetallic Compound

et al. 2023

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Hydrostatic and chemical pressure are efficient stimuli to alter the crystal structure and are commonly used for tuning electronic and magnetic properties in materials science. However, chemical pressure is difficult to quantify and a clear correspondence between these two types of pressure is still lacking. Here, we study intermetallic candidates for a permanent magnet with a negative thermal expansion (NTE). Based on in situ synchrotron X-ray diffraction, negative chemical pressure is revealed in Ho 2 Fe 17 on Al doping and quantitatively evaluated by using temperature and pressure dependence of unit cell volume. A combination of magnetization and neutron diffraction measurements also allowed one to compare the effect of chemical pressure on magnetic ordering with that of hydrostatic pressure. Intriguingly, pressure can be used to control suppression and enhancement of NTE. Electronic structure calculations indicate that pressure affected the top of the majority band with respect to the Fermi level (E F ), which has implications for the magnetic stability, which in turn plays a critical role in modulating magnetism and NTE. This work presents a good example of understanding the effect of pressure and utilizing it to control properties of functional materials.

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“…The design and selection of materials for the pressure cells are largely based on existing knowledge as reported previously [8][9]. The sketch, finite element analysis (FEA) and load test will be outlined here.…”

Section: Design and Load Testmentioning

confidence: 99%

Two Pressure Cells for Quasielastic and Inelastic Neutron Scatterings

et al. 2022

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Two clamp pressure cells for QENS and INS have been developed. One is a hybrid CuBe/NiCrAl cell which is for relative high pressure up to 2.5 GPa and another one is made from high strength aluminium alloy (mesolite NA723) with pressure up to 0.5 GPa. The sample volume is 0.3 mL and 1 mL, respectively. The pressure cells have been thoroughly calibrated and tested. In addition, the contribution to phonon density of states from the pressure cells has been evaluated. Measurements of the phonon density of states for two perfluorocarbon polymer liquids FOMBLIN oil and Fluorinert have indicated that they are suitable to serve as the low background pressure transmission media for high pressure INS experiments. The applications of the pressure cells for INS and QENS are demonstrated by studies of pressure-induced phase transition of plastic crystals.

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Development of a Hybrid CuBe/NiCrAl Clamp-Type High Pressure Cell for Neutron Diffraction

Cited by 10 publications

References 9 publications

Pressure dependence of coherence-incoherence crossover behavior in KFe2As2 observed by resistivity and As75 -NMR/NQR

Pressure dependence of coherence-incoherence crossover behavior in KFe2As2 observed by resistivity and As75 -NMR/NQR

Pressure-Modulated Magnetism and Negative Thermal Expansion in the Ho₂Fe₁₇ Intermetallic Compound

Two Pressure Cells for Quasielastic and Inelastic Neutron Scatterings

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Development of a Hybrid CuBe/NiCrAl Clamp-Type High Pressure Cell for Neutron Diffraction

Cited by 10 publications

References 9 publications

Pressure dependence of coherence-incoherence crossover behavior in KFe2As2 observed by resistivity and As75 -NMR/NQR

Pressure dependence of coherence-incoherence crossover behavior in KFe2As2 observed by resistivity and As75 -NMR/NQR

Pressure-Modulated Magnetism and Negative Thermal Expansion in the Ho2Fe17 Intermetallic Compound

Two Pressure Cells for Quasielastic and Inelastic Neutron Scatterings

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Product

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Pressure-Modulated Magnetism and Negative Thermal Expansion in the Ho₂Fe₁₇ Intermetallic Compound