000859932 001__ 859932 000859932 005__ 20250129094352.0 000859932 0247_ $$2doi$$a10.1103/PhysRevB.99.014425 000859932 0247_ $$2ISSN$$a0163-1829 000859932 0247_ $$2ISSN$$a0556-2805 000859932 0247_ $$2ISSN$$a1050-2947 000859932 0247_ $$2ISSN$$a1094-1622 000859932 0247_ $$2ISSN$$a1095-3795 000859932 0247_ $$2ISSN$$a1098-0121 000859932 0247_ $$2ISSN$$a1538-4489 000859932 0247_ $$2ISSN$$a1550-235X 000859932 0247_ $$2ISSN$$a2469-9950 000859932 0247_ $$2ISSN$$a2469-9969 000859932 0247_ $$2Handle$$a2128/21456 000859932 0247_ $$2WOS$$aWOS:000456299700008 000859932 0247_ $$2altmetric$$aaltmetric:54277813 000859932 037__ $$aFZJ-2019-00744 000859932 082__ $$a530 000859932 1001_ $$0P:(DE-Juel1)151336$$aJin, Wentao$$b0$$eCorresponding author 000859932 245__ $$aSpiral magnetic ordering of the Eu moments in EuNi$_2$As$_2$ 000859932 260__ $$aWoodbury, NY$$bInst.$$c2019 000859932 3367_ $$2DRIVER$$aarticle 000859932 3367_ $$2DataCite$$aOutput Types/Journal article 000859932 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1711019193_27452 000859932 3367_ $$2BibTeX$$aARTICLE 000859932 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000859932 3367_ $$00$$2EndNote$$aJournal Article 000859932 520__ $$aThe ground-state magnetic structure of EuNi2As2 was investigated by single-crystal neutron diffraction. At base temperature, the Eu2+ moments are found to form an incommensurate antiferromagnetic spiral-like structure with a magnetic propagation vector of k=(0,0,0.92). They align ferromagnetically in the ab plane with the moment size of 6.75(6) μB, but rotate spirally by 165.6(1)∘ around the c axis from layer to layer. The magnetic order parameter in the critical region close to the ordering temperature TN=15 K shows critical behavior with a critical exponent of βEu=0.35(2), consistent with the three-dimensional Heisenberg model. 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