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

Abstract

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.

Itinerant G-type antiferromagnet SrCr2As2 studied by magnetization, heat capacity, electrical resistivity, and NMR measurements

“…3(a). There is no evidence for the first-order antiferromagnetic/paramagnetic transition in the CrAs impurity phase [29,30] at 258 K. In addition, the directionaveraged χ of CrAs is only ≈ 5.5 and 7.4 × 10 −4 cm 3 /mol for T → 0 and 300 K, respectively [30], which when multiplied by the small CrAs fraction of the sample is small compared to the measured polycrystalline data in Fig. 3(a).…”

NMR spectrum analysis for CrAs at ambient pressure

“…NMR measurements were performed using the conventional spin-echo method for the 75 As nucleus with the nuclear spin of I = 3/2. axis is the easy axis at ambient pressure, [7,8] suggesting that the orientation is achieved for H b. The calculation suggests that V xx is along the b axis, that is, the magnetic field is expected to be along just V xx .…”

Research and prospect of CrAs superconductor

“…合肥强磁场中心 [37] 采用了气象传输的方法, 也 另外的进展是磁输运测量, 最近Niu等人 [39] 研究 [34] 表 1 采用不同烧结温度和方法得到不同品质的CrAs单晶 [37] Table 1 Single crystal CrAs grow at different temperatures and conditions [37] 方法 细节 结论 [39] 磁性涨落之间的相互作用.…”