Superconductivity and magnetic interactions in the pseudoternary bct system Ho(Rh1−xRux)4B4

✍ Scribed by H. Adrian; A. Thomä; A. Meinelt; R. Blank; B. Hensel; G. Adrian; M. Steiner

• Publisher: Elsevier Science
• Year: 1987
• Weight: 289 KB
• Volume: 148
• Category: Article
• ISSN: 0378-4363
• DOI: 10.1016/0378-4363(87)90163-x

✦ Synopsis

We report temperature-and magnetic-field-dependent neutron diffraction experiments on polycrystalline samples of the pseudoternary bct Ho(Rh~_xRu,)4B 4 system. The x-dependent variation of the electronic density of states at the Fermi level N(Ev) , which causes the well-known characteristic superconducting phase diagram, also leads to a change of the magnetic order from a non-collinear antiferromagnet in coexistence with superconductivity for x <0.40 to a canted ferromagnet for x > 0.80. A transition between these two magnetic structures which is accompanied by a destruction of superconductivity is also induced by an external field. The observed hysteresis in the H~2(T) data below 0.6 K and magnetic relaxation phenomena in )t,,c(T) for 0.40~<x~<0.70 are discussed on the basis of competing magnetic interactions.