Heat capacity measurements on UBe sub(13) in rotated magnetic fields: Anisotropic response in the normal state and absence of nodal quasiparticles
In order to gain insight into the superconducting (SC) gap of UBe sub(13), we studied its quasiparticle excitations by means of heat-capacity measurements. Quite unexpectedly, we found the isotropic C(H) proportional to HC(H) proportional to H behavior in low fields at low temperatures, implying the...
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| Veröffentlicht in: | Journal of magnetism and magnetic materials 2016-02, Vol.400, p.52-55 |
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| container_title | Journal of magnetism and magnetic materials |
| container_volume | 400 |
| creator | Shimizua, Yusei Kittakaa, Shunichiro Sakakibaraa, Toshiro Hagab, Yoshinori Yamamotob, Etsuji Amitsukac, Hiroshi Tsutsumid, Yasumasa Machidae, Kazushige |
| description | In order to gain insight into the superconducting (SC) gap of UBe sub(13), we studied its quasiparticle excitations by means of heat-capacity measurements. Quite unexpectedly, we found the isotropic C(H) proportional to HC(H) proportional to H behavior in low fields at low temperatures, implying the absence of nodal quasiparticle excitations. This result indicates that the SC gap in UBe sub(13) is fully open over the Fermi surfaces. Furthermore, we observed a characteristic oscillation of heat capacity both in the SC and non-Fermi-liquid normal states above similar to 2 T, and the angular variation of heat capacity possibly originates from anisotropic magnetic response of the heavy-electron state. Our result regarding the low-energy quasiparticle excitations in the SC and normal states will be a clue to understand the unusual nature of UBe sub(13). |
| doi_str_mv | 10.1016/j.jmmm.2015.08.003 |
| format | Article |
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| ispartof | Journal of magnetism and magnetic materials, 2016-02, Vol.400, p.52-55 |
| issn | 0304-8853 |
| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | Anisotropy Excitation Gain Heat capacity Magnetic fields Magnetism Specific heat Superconductivity |
| title | Heat capacity measurements on UBe sub(13) in rotated magnetic fields: Anisotropic response in the normal state and absence of nodal quasiparticles |
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