Incommensurate to commensurate antiferromagnetism in CeRhAl4Si2: An Al-27 NMR study

Article

关键词: ELECTRON-PARAMAGNETIC RESONANCE;    NUCLEAR MAGNETIC RELAXATION;    RARE-EARTH COMPOUNDS;    SPIN RELAXATION;    CRYSTAL-FIELDS;    SUPERCONDUCTIVITY;    CERHIN5;   

DOI  :  10.1103/PhysRevB.93.014402

来源: SCIE

【 摘 要 】

Al-27 nuclear magnetic resonance (NMR) experiments have been performed on a single crystal of CeRhAl4Si2, which is an antiferromagnetic Kondo-lattice compound with successive antiferromagnetic transitions of T-N1 = 14 K and T-N2 = 9 K at zero external field. In the paramagnetic state, the Knight shifts, quadrupolar frequency, and asymmetric parameter of electrical field gradient on the Al sites have been determined, which have local orthorhombic symmetry. The transferred hyperfine coupling constants are also determined. Analysis of the NMR spectra indicates that a commensurate antiferromagnetic structure exists below T-N2, but an incommensurate modulation of antiferromagnetic moments is present in the antiferromagnetic state between T-N1 and T-N2. The spin-lattice relaxation rate suggests that the 4 f electrons behave as local moments at temperatures above T-N1.

【 授权许可】

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