Possible competitive coexistence of ferromagnetism and superconductivity in UGe2
Gaku Motoyama, Setsushi Nakamura, Hiroyuki Kadoya, Takashi Nishioka, Noriaki K. Sato
DOI 10.1103/PhysRevB.65.020510 · Physical Review B
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Abstract
We have measured magnetizations of the ferromagnet UGe2 which shows superconductivity in a narrow external pressure range, P1<~P<~P2, in the ferromagnetic state. When P is close to P1 in the superconducting phase, the ac magnetic susceptibility indicates a peak-anomaly associated with the ferromagnetic transition and an imperfect superconducting shielding effect. As P increases away from P1, the peak anomaly becomes substantially broad and obscure, while the diamagnetic susceptibility approaches a perfect superconducting shielding. We have also observed that a saturation magnetization at low temperature shows a steep decrease with increasing P in the superconducting state. From these observations, we suggest that the superconductivity coexists in a competitive way with the ferromagnetism; as P increases, a volume fraction of the superconducting state grows over the system, while the ferromagnetic ordering possibly becomes spatially inhomogeneous.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| UGe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.7 | 1.18 GPa | onset |
| UGe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.9 | 1.18 GPa | onset |
| 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 |
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