Determination of the magnetic structure of CePt 2 In 7 by means of neutron diffraction

Matthias Raba (1, 2) , Eric Ressouche (3) , N. Qureshi (4) , Claire Colin (5) , V. Nassif (6) , S. Ota (7) , Y. Hirose (7) , R. Settai (7) , Pierre Rodière (1) , I. Sheikin (2)

1 NEEL - MagSup - Magnétisme et Supraconductivité
2 LNCMI-G - Laboratoire national des champs magnétiques intenses - Grenoble
3 MDN - Magnétisme et Diffusion Neutronique
4 ILL - Institut Laue-Langevin
5 NEEL - MRS - Matériaux, Rayonnements, Structure
6 NEEL - CRG - CRG & Grands instruments
7 Niigata University

The magnetic structure of the heavy fermion antiferromagnet CePt 2 In 7 is determined using neutron diffraction. We find a magnetic wave vector q M = (1/2,1/2,1/2), which is temperature independent up to T N = 5.5 K. A staggered moment of 0.45(1)μ B at 2 K resides on the Ce ion. The nearest-neighbor moments in the tetragonal basal plane are aligned antiferromagnetically. The moments rotate by 90 • from one CeIn 3 plane to another along the c axis. A much weaker satellite peak with an incommensurate magnetic wave vector q M = (1/2,1/2,0.47) seems to develop at low temperature. However, the experimental data available so far are not sufficient to draw a definitive conclusion about the possible coexistence of commensurate and incommensurate magnetic structures in this material.

Domaines: Supraconductivité [cond-mat.supr-con]; Electrons fortement corrélés [cond-mat.str-el]

Matthias Raba, Eric Ressouche, N. Qureshi, Claire Colin, V. Nassif, et al.. Determination of the magnetic structure of CePt 2 In 7 by means of neutron diffraction. Physical Review B, 2017, 95 (16), pp.161102. ⟨10.1103/PhysRevB.95.161102⟩. ⟨hal-01828364⟩