Two qualitatively different superconducting phases under high pressure in single-crystalline CeNiGe$_{3}$
| Autor: | Kitagawa, Shunsaku, Araki, Shingo, Kobayashi, Tatsuo C., Ikeda, Yoichi |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | J. Phys. Soc. Jpn. 89, 063702 (2020) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.7566/JPSJ.89.063702 |
| Popis: | We have measured the temperature dependence of resistivity in single-crystalline CeNiGe$_{3}$ under hydrostatic pressure in order to establish the characteristic pressure-temperature phase diagram. The transition temperature to AFM-I phase $T_{\rm N1}$ = 5.5 K at ambient pressure initially increases with increasing pressure and has a maximum at $\sim$ 3.0 GPa. Above 2.3 GPa, a clear zero-resistivity is observed (SC-I phase) and this superconducting (SC) state coexists with AFM-I phase. The SC-I phase suddenly disappears at 3.7 GPa simultaneously with the appearance of an additional kink anomaly corresponding to the phase transition to AFM-II phase. The AFM-II phase is continuously suppressed with further increasing pressure and disappears at $\sim$ 6.5 GPa. In the narrow range near the critical pressure, an SC phase reappears (SC-II phase). A large initial slope of upper critical field $\mu_0H_{\rm c2}$ and non-Fermi liquid behavior indicate that the SC-II phase is mediated by antiferromagnetic fluctuations. On the other hand, the robust coexistence of the SC-I phase and AFM-I phase is unusual on the contrary to superconductivity near a quantum critical point on most of heavy-fermion compounds. Comment: 5 pages, 6 figures |
| Databáze: | arXiv |
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