Evidence for unconventional superconducting fluctuations in heavy-fermion compound CeNi2Ge2
Creators
- 1. Osaka Univ., Graduate School of Engineering Science, Toyonaka, Osaka (Japan)
- 2. Okayama Univ., Faculty of Science, Okayama (JP)
- 3. Toyama Prefectural Univ., Faculty of Engineering, Toyama (JP)
- 4. Keio Univ., Dept. of Applied Physics and Physico-Informatics, Yokohama, Kanagawa (JP)
- 5. Dept. of Materials Science and Engineering, Univ. of California at Berkeley, Berkely, CA (US)
Description
We present evidence for unconventional superconducting fluctuations in a heavy-fermion compound CeNi2Ge2. The temperature dependence of the 73Ge nuclear-spin-lattice-relaxation rate 1/T1 indicates the development of magnetic correlations and the formation of a Fermi-liquid state at temperatures lower than TFL=0.4 K, where 1/T1T is constant. The resistance and 1/T1T measured on an as-grown sample decrease below Tconset=0.2 K and TcNQR=0.1 K, respectively; these are indicative of the onset of superconductivity. However, after annealing the sample to improve its quality, these superconducting signatures disappear. These results are consistent with the emergence of unconventional superconducting fluctuations in close proximity to a quantum critical point from the superconducting to the normal phase in CeNi2Ge2. (author)
Additional details
Publishing Information
- Journal Title
- Journal of the Physical Society of Japan
- Journal Volume
- 75
- Journal Issue
- 4
- Journal Page Range
- p. 043702.1-043702.4
- ISSN
- 0031-9015
INIS
- Country of Publication
- Japan
- Country of Input or Organization
- Japan
- INIS RN
- 37071831
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Descriptors DEI
- ANTIFERROMAGNETISM; CERIUM ALLOYS; ELECTRIC CONDUCTIVITY; FLUCTUATIONS; GERMANIUM ALLOYS; MAGNETIZATION; MONOCRYSTALS; NICKEL ALLOYS; NUCLEAR QUADRUPOLE RESONANCE; SPIN-LATTICE RELAXATION; SUPERCONDUCTIVITY; TEMPERATURE DEPENDENCE
- Descriptors DEC
- ALLOYS; CRYSTALS; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; MAGNETISM; PHYSICAL PROPERTIES; RARE EARTH ALLOYS; RELAXATION; RESONANCE; TRANSITION ELEMENT ALLOYS; VARIATIONS
Optional Information
- Notes
- 18 ref., 5 figs.