Superconductivity and magnetism of a body-centered tetragonal ErRh4B4 single crystal. II. Large anisotropy of Hc2
H. Iwasaki, Y. Muto
DOI 10.1103/PhysRevB.33.4680 · Physical Review B
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Abstract
Upper critical field Hc2 and magnetization are measured on a single crystal of body-centered tetragonal (bct) ErRh4B4 which is an antiferromagnetic superconductor and behaves metamagnetically in the c plane under a magnetic field below TN. The temperature dependences of Hc2 along the [001] and [100] axes are roughly similar to each other in that both Hc2(T) take maxima with decreasing temperature but the magnitude of Hc2 along the [001] axis is quite large compared to that along the [100] axis. Furthermore, the angular dependence of Hc2 in the c plane shows the fourfold anisotropy above TN and the complex twofold anisotropy below TN. The anisotropy of Hc2 is closely related with that of the magnetization. From the analysis in which the spin polarization due to the s-f exchange interaction and the electromagnetic interaction are taken into account it is made clear that the spin polarization plays a very important role in determining Hc2. The s-f exchange constant and the spin-orbit scattering parameter are also determined. It is indicated that the s-f exchange interaction is ferromagnetic and the spin-orbit scattering is very strong in the bct ErRh4B4 crystal. Finally temperature dependence of Hc2 in the c plane below TN is qualitatively discussed, being connected with metamagnetism.
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. | 7.8 | Pressure not reported | zero_resistance |
| LuRh4B4 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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