Absence of superconductivity in bulk Nd1−xSrxNiO2
By Qing Li, Chengping He, Jin Si, Xiyu Zhu, Yue Zhang, H. Wen. Communications Materials, 2019
157 citations recorded by the source corpus.
Superconductivity at 9–15 K was recently discovered in Nd0.8Sr0.2NiO2 films. Since the Ni1+ ionic state in NdNiO2 may have the same 3d9 outer-shell electronic orbital as in cuprate superconductors, it is interesting to know whether superconductivity has a similar mechanism in these two systems. Here we synthesize bulk samples of Nd1−xSrxNiO2 (x = 0, 0.2, 0.4) with inhomogeneous Sr distribution and Ni deficiency. Resistivity measurements show insulating behavior without the presence of superconductivity, different to the previously reported films. Although applying pressure up to about 50.2 GPa significantly suppresses the insulating behavior, superconductivity remains absent. The magnetization behavior exhibits a Curie–Weiss law with a paramagnetic moment of about 2 μB/f.u. Since the lattice constants derived from our diffraction data are very close to the previously reported superconducting Nd0.8Sr0.2NiO2 films, we suggest that superconductivity in that system may have arisen from interface or stress-related effects, or nickel deficiency in our bulk samples that might prevent the emergence of superconductivity. Superconductivity was recently observed in Nd0.8Sr0.2NiO2 films. Here, superconductivity is found to be absent in bulk polycrystalline samples of Sr-doped NdNiO2, raising questions regarding the origin of superconductivity in this material.
Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/f70b6174b8d09bf7ab18fdfa616a23da078948ae
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Condensed Matter Physics
Citations in the corpus
- Nickelate superconductors—a renaissance of the one-band Hubbard model (2020, background): “1(b) of the main text also the recently determined experimental phase diagram of SrxNd1−xNdO2 by Li et al.19.”