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Effect of La doping on magnetic structure in heavy fermion CeRhIn5

The magnetic structure of Ce0.9La0.1RhIn5 is measured using neutron diffraction. It is identical to the incommensurate transverse spiral for CeRhIn5, with a magnetic wave vector q_M=(1/2,1/2,0.297), a staggered moment of 0.38(2)Bohr magneton per Ce at 1.4K and a reduced Neel temperature of 2.7 K.

antiferromagnetic structures of structurally related heavy fermion Ce 2 RhIn 8 and CeIn 3 [9]. Applying pressure to CeRhIn 5 or doping it with Ir on the Rh site has only a small effect on T N until the material becomes a superconductor [1,10], while doping with La on the Ce site reduces T N linearly [11]. We have found with neutron diffraction measurements that the incommensurate magnetic structure is robust against these external perturbations. Results on Ce 0.9 La 0.1 RhIn 5 are reported here.
A plate-like single crystal sample of Ce 0.9 La 0.1 RhIn 5 , weighing 0.4 g, was grown from an In flux. It has the tetragonal HoCoGa 5 structure (space group No. 123, P4/mmm) with lattice parameters a = 4.643Å and b = 7.530Å below 20 K. Neutron diffraction experiments were performed at NIST using the thermal triple-axis spectrometer BT9 in a two-axis mode. Neutrons with incident energy E = 35 meV were selected using the (002) reflection of a pyrolytic graphite (PG) monochromator. PG filters of total thickness 8cm were used to remove higher-order neutrons. The horizontal collimations were 40-48-48. The sample temperature was regulated by a top loading pumped He cryostat.
Temperature dependent Bragg peaks were found in Ce 0.9 La 0.1 RhIn 5 along the (1/2,1/2,l) line only at incommensurate positions characterized by q M = (1/2, 1/2, 0.297), which is identical to that for pure CeRhIn 5 . Fig. 1(a) shows a pair of magnetic satellite peaks in a Brillouin zone at 1.4 K and above the Néel temperature. The intensity of the (1/2,1/2,1.297) Bragg peak is shown in Fig 1(b) as the square of the order parameter of the antiferromagnetic phase transition. A Néel temperature of 2.7 K is determined. As shown by the scans at various temperatures in the inset to Fig. 1(b), there is no detectable temperature dependence in the incommensurate magnetic wave vector. This is identical to what is observed for pure CeRhIn 5 [8].
To determine the magnetic structure for Ce 0.9 La 0.1 RhIn 5 , 20 independent magnetic Bragg peaks were measured with rocking scans at 1.4 K. Integrated intensities of these peaks are normalized to the structural Bragg peak (220) to yield magnetic cross sections, σ obs (q) = I(q) sin(θ 4 ), in absolute units (see Table 1). The same magnetic model for CeRhIn 5 [8], offers a reasonable description for Ce 0.9 La 0.1 RhIn 5 . The staggered magnetic moment, M, at 1.4K is 0.38(2)µ B per Ce 0.9 La 0.1 RhIn 5 . Within the error bar, this is the same as the moment for pure CeRhIn 5 . Calculated cross sections, σ cal , are listed in Table 1.
In summary, magnetic structure of Ce 0.9 La 0.1 RhIn 5 is identical to that for pure CeRhIn 5 . While the Néel temperature is reduced from 3.8 K to 2.7 K upon 10% substitution of Ce by La, the staggered moment remains the same within the error bar.  Table 1 Magnetic Bragg intensity, σ obs , observed at 1.4 K in unit of 10 −3 b per Ce 0.9 La 0.1 RhIn 5 . The theoretic intensity, σ cal , is calculated using M = 0.38µ B per Ce 0.9 La 0.1 RhIn 5 .