Specific heat study of the magnetic superconductor HoNi2B2C
Tuson Park, M. B. Salamon, Eun Mi Choi, Heon Jung Kim, Sung-Ik Lee
DOI 10.1103/PhysRevB.69.054505 · Physical Review B
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Abstract
The complex magnetic transitions and superconductivity of HoNi2B2C were studied via the dependence of the heat capacity on temperature and in-plane field angle. We provide an extended, comprehensive magnetic phase diagram for B‖[100] and B‖[110] based on the thermodynamic measurements. Three magnetic transitions and the superconducting transition were clearly observed. The 5.2 K transition (TN) shows a hysteresis with temperature, indicating the first-order nature of the transition at B=0T. The 6 K transition TM, namely the onset of the long-range ordering, displays a dramatic in-plane anisotropy: TM increases with increasing magnetic field for B‖[100] while it decreases with increasing field for B‖[110]. The anomalous anisotropy in TM indicates that the transition is related to the a-axis spiral structure. The 5.5 K transition T* shows similar behavior to the 5.2 K transition, i.e., a small in-plane anisotropy and scaling with Ising model. This last transition is ascribed to the change from a* dominant phase to c* dominant phase.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HoNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.04 | Pressure not reported | midpoint |
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