Compressibility anomaly in the superconducting material Nb3Al under high pressure

Yu, Zhenhai; Li, C.Y.; Liu, H.Z.

doi:10.1016/j.physb.2012.05.041

Cited by 9 publications

(8 citation statements)

References 24 publications

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“…As seen in the P-V data we have observed an anomaly around 15 GPa very similar to Nb 3 Al [13 ]. In the pressure range between 15 and 19 GPa, where the volume anomaly takes place, the volume is observed to change by only 0.5%.…”

Section: Resultssupporting

confidence: 70%

“…Nb 3 Ga belongs to the A-15 family of superconductors, which has gained importance in recent years, due to their rising technological value from combination of the excellent performance with the good mechanical properties [1]. A-15 superconductors have relatively high transition temperature type I materials, also exhibit high critical current density and critical magnetic field values, which make these compounds for some viable applications [2]. Some of A-15 compounds with high critical temperatures are V 3 Si (T c = 17 K) [3], Nb 3 Al (T c = 19 K) [4], and Nb 3 Sn (T c = 18 K) [5].…”

Section: Introductionmentioning

confidence: 99%

“…Even though there are high pressure transport measurements available for these compounds crystal structure investigations are still elusive. Recently Yu et al [13] have reported their high pressure results on Nb 3 Al. This material shows an anomaly at high pressures around 15 GPa.…”

Section: Introductionmentioning

confidence: 99%

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High pressure transport and structural studies on Nb3Ga superconductor

Mkrtcheyan

Kumar

Baker

et al. 2015

Physica B: Condensed Matter

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The crystal structure of A-15 superconductor Nb 3 Ga with a critical temperature T c = 16.5 K has been investigated by high pressure x-ray diffraction (HPXRD) using synchrotron x-rays and a diamond anvil cell under Ne pressure medium. The high pressure structural results indicate that Nb 3 Ga is stable up to 41 GPa. The P-V plot shows an anomaly around 15 GPa even though there are no pressure induced structural transitions are observed. High pressure resistance measurements were performed up to 0.5 GPa to understand the variation of T c under pressure. Our results show a positive pressure effect on T c .

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Section: Resultssupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

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High pressure transport and structural studies on Nb3Ga superconductor

Mkrtcheyan

Kumar

Baker

et al. 2015

Physica B: Condensed Matter

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“…High pressure X-ray diffraction (HP-XRD) experiments [15], carried out on technological Nb 3 Sn wires, showed an anomaly in the unit cell volume compression (around 5 GPa) not associated with any structural phase transition. A similar effect, ascribed to isostructural transitions, was observed around 15 GPa for other A15 systems, e.g., Nb 3 Ga [18] and Nb 3 Al [19] . Whereas, low temperature (T = 10 K) HP-XRD measurements, performed on a slightly non stoichiometric Nb 3 Sn 1−x single crystal, have evidenced structural instabilities around 3 GPa, suggesting a dimerization of Nb-Nb chains, providing alternating shorter/longer Nb-Nb pairs [17].…”

Section: Introductionsupporting

confidence: 77%

Anomalous Behavior in the Atomic Structure of Nb3Sn under High Pressure

et al. 2021

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In the present study, the local atomic structure of a Nb3Sn superconductor sample has been probed by X-ray absorption fine structure (XAFS) as a function of hydrostatic pressure (from ambient up to 26 GPa) using a diamond anvil cell set-up. The analysis of the Nb-K edge extended X-ray absorption fine structure (EXAFS) data was carried out combining standard multi shell structural refinement and reverse Monte Carlo method to provide detailed in situ characterization of the pressure-induced evolution of the Nb local structure in Nb3Sn. The results highlight a complex evolution of Nb chains at the local atomic scale, with a peculiar correlated displacement of Nb–Nb and Nb–Nb–Nb configurations. Such a local effect appears related to anomalies evidenced by X-ray diffraction in other superconductors belonging to the same A15 crystallographic structure.

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“…This nonmonotonic behavior in the crystal volume under compressive stress (particularly around 1.5% stress value) in the crystal may lead to electronic topological transitions (ETT). This can be seen in the Nb 3 Al [34] and Nb 3 Ga [35] based compounds experimentally and theoretically it is predicted because of ETT [36].…”

Section: Notesmentioning

confidence: 56%

Evidence of ferromagnetic ground state and strong spin phonon coupling in Zr₂TiAl with bi-axial strain: first principles study

2019

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A detailed study on the inter-metallic alloy, Zr 2 TiAl, has been carried out using first principle electronic structure calculations. We found that a small value of bi-axial strain/stress cause a phase change from anti-ferromagnetic(AFM) to ferromagnetic(FM) with a structural transition from face center cubic (fcc) to body center tetragonal (bct). Calculated electronic band structures show that all strained structures are metallic in nature with Zr-d and Ti-d orbital dominated energy bands near the Fermi level(E F ). The stability of FM phase is confirmed with phonon dispersion calculations by using density functional perturbation theory (DFPT). It has been observed that AFM state with both positive and negative bi-axial stress exhibits unstable modes while corresponding FM state shows no such instability. This clearly indicates the existence of large spin phonon coupling in this material.

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Compressibility anomaly in the superconducting material Nb3Al under high pressure

Cited by 9 publications

References 24 publications

High pressure transport and structural studies on Nb3Ga superconductor

High pressure transport and structural studies on Nb3Ga superconductor

Anomalous Behavior in the Atomic Structure of Nb3Sn under High Pressure

Evidence of ferromagnetic ground state and strong spin phonon coupling in Zr₂TiAl with bi-axial strain: first principles study

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Compressibility anomaly in the superconducting material Nb3Al under high pressure

Cited by 9 publications

References 24 publications

High pressure transport and structural studies on Nb3Ga superconductor

High pressure transport and structural studies on Nb3Ga superconductor

Anomalous Behavior in the Atomic Structure of Nb3Sn under High Pressure

Evidence of ferromagnetic ground state and strong spin phonon coupling in Zr2TiAl with bi-axial strain: first principles study

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Evidence of ferromagnetic ground state and strong spin phonon coupling in Zr₂TiAl with bi-axial strain: first principles study