44962 20210121114515.0 doi 10.1103/PhysRevB.91.134425 sideral 93299 ART-2015-93299 eng Adroja, D.T. Muon spin rotation and neutron scattering study of the noncentrosymmetric tetragonal compound CeAuAl3 2015 Access copy available to the general public Unrestricted We have investigated the noncentrosymmetric tetragonal heavy fermion compound CeAuAl3 using muon spin rotation (µSR), neutron diffraction (ND), and inelastic neutron scattering (INS) measurements. We have also revisited the magnetic, transport, and thermal properties. The magnetic susceptibility reveals an antiferromagnetic transition at 1.1 K with, possibly, another magnetic transition near 0.18 K. The heat capacity shows a sharp ¿-type anomaly at 1.1 K in zero field, which broadens and moves to a higher temperature in an applied magnetic field. Our zero-field µSR and ND measurements confirm the existence of a long-range magnetic ground state below 1.2 K. Further, the ND study reveals an incommensurate magnetic order with a magnetic propagation vector k=(0, 0, 0.52(1)) and a spiral structure of Ce moments coupled ferromagnetically within the ab plane. Our INS study reveals the presence of two well-defined crystal electric field (CEF) excitations at 5.1 and 24.6 meV in the paramagnetic phase of CeAuAl3 that can be explained on the basis of the CEF theory and the Kramer''s theorem for a Ce ion having a 4f1 electronic state. Furthermore, low energy quasielastic excitations show a Gaussian line shape below 30 K compared to a Lorentzian line shape above 30 K, indicating a slowdown of spin fluctuations below 30 K. We have estimated a Kondo temperature of TK=3.5K from the quasielastic linewidth, which is in good agreement with that estimated from the heat capacity. This study also indicates the absence of any CEF-phonon coupling unlike that observed in isostructural CeCuAl3 The CEF parameters, energy level scheme, and their wave functions obtained from the analysis of INS data explain satisfactorily the single crystal susceptibility in the presence of two-ion anisotropic exchange interaction in CeAuAl3. info:eu-repo/grantAgreement/ES/DGA/E81 info:eu-repo/grantAgreement/ES/MINECO/MAT2009-10040 info:eu-repo/grantAgreement/ES/MINECO/MAT2012-30763 info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 3.718 2015 PHYSICS, CONDENSED MATTER 16 / 67 = 0.239 2015 Q1 T1 2.377 2015 Electronic, Optical and Magnetic Materials 2015 Q1 Condensed Matter Physics 2015 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion (orcid)0000-0001-6117-9858 De la Fuente, C. Universidad de Zaragoza Fraile, A. Hillier, A.D. Daoud-Aladine, A. Kockelmann, W. Taylor, J.W. Koza, M.M. Burzurí, E. (orcid)0000-0001-6284-0521 Luis, F. Universidad de Zaragoza (orcid)0000-0002-2624-6004 Arnaudas, J.I. Universidad de Zaragoza Del Moral, A. 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 91, 13 (2015), 134425 [12 p.] Phys. Rev. B, Condens. matter mater. phys. Physical Review B 1098-0121 2121157 http://zaguan.unizar.es/record/44962/files/texto_completo.pdf Versión publicada 130224 http://zaguan.unizar.es/record/44962/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:44962 articulos driver 2021-01-21-10:59:23 ARTICLE