Pressure dependence of the magnetic order in CrAs: A neutron diffraction investigation

Keller, L.; White, J. S.; Frontzek, Matthias; Babkevich, P.; Susner, Michael A.; Sims, Zachary C.; Sefat, Athena S.; Rønnow, Henrik M.; Rüegg, Ch.

doi:10.1103/physrevb.91.020409

Cited by 40 publications

(55 citation statements)

References 16 publications

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“…At ambient pressure CrAs is characterized by a relatively high Néel temperature T N 270 K [65][66][67][68]. T N decreases approximately by a factor of three for pressures (p) approaching 0.7 GPa, above which the magnetism completely disappears [65,66].…”

Section: Pressure-induced Electronic Phase Separation Of Magnetism Anmentioning

confidence: 99%

High pressure research using muons at the Paul Scherrer Institute

Khasanov

Guguchia

Maisuradze

et al. 2016

High Pressure Research

101

146

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Pressure, together with temperature and magnetic field, is an important thermodynamical parameter in physics. Investigating the response of a compound or of a material to pressure allows to elucidate ground states, investigate their interplay and interactions and determine microscopic parameters. Pressure tuning is used to establish phase diagrams, study phase transitions and identify critical points. Muon spin rotation/relaxation (muSR) is now a standard technique making increasing significant contribution in condensed matter physics, material science research and other fields. In this review, we will discuss specific requirements and challenges to perform muSR experiments under pressure, introduce the high-pressure muon facility at the Paul Scherrer Institute (PSI, Switzerland) and present selected results obtained by combining the sensitivity of the muSR technique with pressure.Comment: Submitted to High Pressure Research. 26 pages, 17 Figure

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Section: Pressure-induced Electronic Phase Separation Of Magnetism Anmentioning

confidence: 99%

High pressure research using muons at the Paul Scherrer Institute

Khasanov

Guguchia

Maisuradze

et al. 2016

High Pressure Research

101

146

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“…By increasing the pressure, the lattice parameters a and c both show a non-monotonic change whereas the lattice parameter b undergoes a rapid contraction at ∼0.18-0.35 GPa, which suggests a pressure-induced isostructural phase transition. 15,20 The T c vs P phase diagram of CrAs resembles that of many of the unconventional superconducting systems above mentioned suggesting the presence of strong antiferromagnetic fluctuations near the critical pressure P c and a possible uncon-Typeset by REVT E X arXiv:1709.07481v1 [cond-mat.str-el] 21 Sep 2017 ventional pairing mechanism. 15 For the sake of completeness we mention that detailed studies of the stability of the ferromagnetism in CrAs crystallizing in the zinc-blende structure have been reported.…”

Section: Introductionmentioning

confidence: 97%

“…The helimagnetic phase is suppressed at about 0.7 GPa, and the superconductivity is realized in a wide pressure range, in the non magnetic state, with a maximum T c ∼ 2.2 K at 1.0 GPa. [17][18][19][20] The structure of CrAs remains stable up to 1.8 GPa, whereas the lattice parameters exhibit anomalous compression behaviors. By increasing the pressure, the lattice parameters a and c both show a non-monotonic change whereas the lattice parameter b undergoes a rapid contraction at ∼0.18-0.35 GPa, which suggests a pressure-induced isostructural phase transition.…”

Section: Introductionmentioning

confidence: 99%

First principles study of structural, magnetic and electronic properties of CrAs

Autieri¹,

Noce

2017

Philosophical Magazine

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We report ab initio density functional calculations of the structural and magnetic properties, and the electronic structure of CrAs. To simulate the observed pressure-driven experimental results, we perform our analysis for different volumes of the unit cell, showing that the structural, magnetic and electronic properties strongly depend on the size of the cell. We find that the calculated quantities are in good agreement with the experimental data, and we review our results in terms of the observed superconductivity.

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“…The pressure-related structural changes occurred concurrently with the appearance of bulk superconductivity, shedding light on the structural and related electronic responses to high pressure, which play a key role toward understanding the superconductivity of CrAs. also been investigated by Keller et al (18), where T N was observed to decrease with increasing pressure (18,19). Measurement of the electrical conductivity of CrAs at 4.2−350 K under high pressure up to 0.9 GPa was performed by Zavadskii and Sibarova (20).…”

Section: Significancementioning

confidence: 99%

Anomalous anisotropic compression behavior of superconducting CrAs under high pressure

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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CrAs was observed to possess the bulk superconductivity under high-pressure conditions. To understand the superconducting mechanism and explore the correlation between the structure and superconductivity, the high-pressure structural evolution of CrAs was investigated using the angle-dispersive X-ray diffraction (XRD) method. The structure of CrAs remains stable up to 1.8 GPa, whereas the lattice parameters exhibit anomalous compression behaviors. With increasing pressure, the lattice parameters a and c both demonstrate a nonmonotonic change, and the lattice parameter b undergoes a rapid contraction at ∼0.18−0.35 GPa, which suggests that a pressure-induced isostructural phase transition occurs in CrAs. Above the phase transition pressure, the axial compressibilities of CrAs present remarkable anisotropy. A schematic band model was used to address the anomalous compression behavior of CrAs. The present results shed light on the structural and related electronic responses to high pressure, which play a key role toward understanding the superconductivity of CrAs.CrAs | anisotropic compression behavior | high pressure | phase transformation T he discovery of superconductivity (T c = 26 K) in ZrCuSiAstype LaFeAs(O 1−x F x ) (1) inspired extensively experimental and theoretical research on the quaternary "1111" compounds RFeAsO, where R represents a lanthanide (La, Ce, Nd, etc.) (2-5). From the point of view of crystallography, the newly discovered iron-based superconductor exhibits a quasi-2D structural character at ambient conditions. Like the CuO 2 plane in copper oxide high-temperature superconductors, the Fe 2 As 2 layers serve as the conduction planes for charge carriers, and the other building blocks are the charge reservoir layers, dominating the carrier density or the chemical potential. The fundamental structural factors of these compounds are of scientific interest as a meaning of achieving a higher superconducting transition temperature. Previous investigation suggests that the symmetry of the tetrahedral FeAs 4 (6), the FeAs interlayer spacing (7), and the anion (such as As) heights from the iron layer (8, 9) are all crucial aspects of the structure. The FeAs planes in binary transition metal monoarsenides (TAs) may serve an analogous role to that served by the CuO plane as a structural proxy for the layered cuprate perovskite family of compounds. These considerations may shed light on the exploration of novel superconductors (10, 11). Moreover, CrAs, in which low-lying states near the Fermi level are dominated by 3d electrons, was found to exhibit superconductivity on the verge of antiferromagnetic order via the application of an external high pressure (10).Transition-metal-based monoarsenides such as CrAs and MnAs have been extensively studied during the past decades mainly due to their complex magnetism and magnetocaloric effects (12, 13). Furthermore, antiferromagnetic order in FeAs was observed below 70 K (14), whereas the discovery of iron-arsenide-based superconductors has renewed interest in FeAs....

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Pressure dependence of the magnetic order in CrAs: A neutron diffraction investigation

Cited by 40 publications

References 16 publications

High pressure research using muons at the Paul Scherrer Institute

High pressure research using muons at the Paul Scherrer Institute

First principles study of structural, magnetic and electronic properties of CrAs

Anomalous anisotropic compression behavior of superconducting CrAs under high pressure

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