Superconductivity and magnetism of a body-centered tetragonal ErRh4B4 single crystal. I. Metamagnetism under the fourfold magnetic anisotropy
H. Iwasaki, M. Ikebe, Y. Muto
DOI 10.1103/PhysRevB.33.4669 · Physical Review B
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Abstract
Magnetization was measured on a single crystal of body-centered tetragonal ErRh4B4, an antiferromagnetic superconductor. It was found that the c axis is the strong hard-magnetization direction. A large fourfold magnetic anisotropy was observed in the tetragonal c plane. The [100] and [010] axes are the easy-magnetization directions and the [110] axis is the hard-magnetization one in the c plane. The magnetization curves below TN show two-step jumps in both cases of H∥[100] and H∥[010] and show only one-step jumps in the case of H∥[110]. Furthermore, it is shown that superconductivity coexists with intermediate magnetic states under a magnetic field in the c plane. The magnetization process in the c plane is understood as metamagnetism and can be explained by a four-sublattice model taking account of the fourfold magnetic anisotropy. Based on the fact that Er spins are approximately located on an fcc lattice in bct ErRh4B4, the type of the antiferromagnetic order is discussed. The two-step jump in the magnetization for H∥[100] indicates that the magnetic structure belongs to the first-kind ordering in the antiferromagnetic fcc lattice. The magnetization process below TN is discussed, and the exchange constants between the magnetic spins are determined. The results obtained are consistent with the stability condition of the first-kind ordering.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| ErRh4B4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.7 | Pressure not reported | unknown |
| ErRh4B4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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