First order crystallographic and magnetic phase transition in CrAs

Boller, H.; Kallel, Ahmed Yahia

doi:10.1016/0038-1098(71)90344-9

Cited by 60 publications

(33 citation statements)

References 7 publications

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“…Magnetic transition at T N occurs as the first-order transition accompanying the abrupt changes of lattice parameters. However, it is reported that its magnetic susceptibility has feasible temperature dependence at temperatures from 4.2 to 1000 K and does not show any remarkable anomaly at T N [1,2]. The neutron diffraction study by Selte et al.…”

Section: Introductionmentioning

confidence: 93%

“…Neutron diffraction studies for CrAs have been done by Kazama and Watanabe [1], Boller and Kallel [2], and Selte et al [3]. According to their results, CrAs is an antiferromagnet with the Néel temperature (T N ) of 248 K [1], 260 K [2], and 280 K [3], respectively, the magnetic structure of which is a double helical one propagating along the c-axis. Magnetic transition at T N occurs as the first-order transition accompanying the abrupt changes of lattice parameters.…”

Section: Introductionmentioning

confidence: 98%

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Magnetic and structural properties of pseudo-binary compounds CrAs1−P

Kanaya¹,

Abe²,

Yoshida³

et al. 2004

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 98%

Magnetic and structural properties of pseudo-binary compounds CrAs1−P

Kanaya¹,

Abe²,

Yoshida³

et al. 2004

Journal of Alloys and Compounds

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“…For decades ago, neutron diffraction studies demonstrate that CrAs endures a special double helical AFM order transition with a spiral propagation vector of 0.353·2πc [8]. Its Néel temperature(T N ) was reported as 260-270K [8], 265K [9], and 240K [10]. The transition is first order, showing a hysteresis between 260-270K [8].…”

Section: Introductionmentioning

confidence: 99%

Single crystal growth of the new pressure-induced-superconductor CrAs via chemical vapor transport

Zhu

Ling

Han

et al. 2016

Journal of Alloys and Compounds

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Mono-arsenide CrAs, endures a helical anti-ferromagnetic order transition at ~ 265 K under ambient pressure. Recently, pressure-induced-superconductivity was discovered vicinity to the helical anti-ferromagnetic order in CrAs [Wei Wu et al., Nature Communications 5, 5508 (2014).]. However, the size of crystal grown via tin flux method is as small as 1 mm in longest dimension. In this work, we report the single crystal growth of CrAs with size of 1 × 5 × 1 mm 3 via chemical vapor transport method and its physical properties.

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“…2,3 The magnetic transition is accompanied by a large magnetostriction of ∆b/b = +5.5%, ∆a/a = −0.3%, and ∆c/c = −0.9% below T N . 4,5 The crystal structure in the helimagnetic phase has been reported to belong to the same space group as the paramagnetic (PM) phase, 4, 5 although the magnetic structure is incommensurate.…”

mentioning

confidence: 99%

Superconductivity of 2.2 K under Pressure in Helimagnet CrAs

et al. 2014

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We report resistivity measurements of the helimagnet CrAs under pressures. The helimagnetic transition with TN ∼ 265 K at ambient pressure is completely suppressed above a critical pressure of Pc ∼ 0.7 GPa, and superconductivity is observed at ∼ 2.2 K for zero resistance, which exists in a wide pressure range extending beyond 3 GPa. Both the upper critical field Hc2 and the coefficient A in the resistivity increase toward Pc, suggesting that the superconductivity of CrAs is mediated by electronic correlations enhanced in the vicinity of the helimagnetic phase.KEYWORDS: CrAs, superconductivity, helimagnet, pressure 3d electron systems can offer stages that induce intriguing superconductivity such as that realized in cuprates, Fe pnictides, and cobalt oxyhydrate. Superconducting (SC) mechanisms and symmetries are diverse depending on the material, and thus the discovery of superconductivity in a new system is crucial for the development of the field of research on superconductivity. In this paper, we report the discovery of a pressure-induced superconductivity of ∼ 2.2 K in the helimagnet CrAs through resistivity measurements. This is the first example of superconductivity in Cr-based magnetic systems. Very recently, W. Wu and coworkers have independently obtained similar results on the occurrence of superconductivity under high pressure in CrAs through resistivity and susceptibility measurements. 1CrAs has an orthorhombic MnP-type crystal structure with the space group of P nma and shows a firstorder magnetic transition at T N ∼ 265 K. Most research studies of the magnetic property of CrAs have been performed in the 1970s. The magnetic structure of CrAs is a double-helical one represented by a propagation vector of 0.354 · 2πc * and a magnetic moment of ∼ 1.7µ B /Cr that lies in the ab plane.2, 3 The magnetic transition is accompanied by a large magnetostriction of ∆b/b = +5.5%, ∆a/a = −0.3%, and ∆c/c = −0.9% below T N .4, 5 The crystal structure in the helimagnetic phase has been reported to belong to the same space group as the paramagnetic (PM) phase, 4, 5 although the magnetic structure is incommensurate.Single crystals of CrAs were prepared by the Sn-flux method similar to that described in Ref. 6. The resistivity measurements under pressure were performed using samples #1 and #2, which are from different batches. Sample #1 was obtained accidentally from a mixture of Sr:Cr:As:Sn=1:2:2:20, which was prepared with the aim of producing SrCr 2 As 2 ; however, CrAs was obtained as the main product. For sample #2, a mixture of Cr:As:Sn=1:1:10 was prepared. For both samples, the mixture was placed in an alumina crucible and sealed in an evacuated quartz ampoule. The ampoule was heated slowly up to 1050• C, and held there for 2 h, and then cooled to 600

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First order crystallographic and magnetic phase transition in CrAs

Cited by 60 publications

References 7 publications

Magnetic and structural properties of pseudo-binary compounds CrAs1−P

Magnetic and structural properties of pseudo-binary compounds CrAs1−P

Single crystal growth of the new pressure-induced-superconductor CrAs via chemical vapor transport

Superconductivity of 2.2 K under Pressure in Helimagnet CrAs

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