Th2NiC2: a low density of states superconductor
| Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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| Data(s) |
01/11/2013
01/11/2013
2012
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| Resumo |
The metallic carbides exhibit many novel prototypes of crystalline structure. Among these compounds Th2NiC2 was reported in 1991 as a new carbide which crystallizes in the U2IrC2 prototype structure. In this work we report a reinvestigation of the synthesis of this compound. We find that Th2NiC2 is a new superconductor. Our results suggest that this phase is stable only at high temperatures in the system Th-Ni-C. The substitution of Th by Sc stabilizes the phase and improves the superconducting properties. The highest superconducting critical temperature occurs at 11.2 K with nominal composition Th1.8Sc0.2NiC2. The electronic coefficient determined by specific heat measurements is close to zero. This unusual result can be explained by covalent bonding in the compound. Brazilian agency CNPq CNPq (Brazilian agency) [201455/2008-0] Fapesp (Brazilian agency) [2010/1770-3] Brazilian agency FAPESP AFOSR MURI AFOSR MURI |
| Identificador |
SUPERCONDUCTOR SCIENCE & TECHNOLOGY, BRISTOL, v. 25, n. 4, supl. 1, Part 3, pp. 679-686, APR, 2012 0953-2048 http://www.producao.usp.br/handle/BDPI/37330 10.1088/0953-2048/25/4/045010 |
| Idioma(s) |
eng |
| Publicador |
IOP PUBLISHING LTD BRISTOL |
| Relação |
SUPERCONDUCTOR SCIENCE & TECHNOLOGY |
| Direitos |
restrictedAccess Copyright IOP PUBLISHING LTD |
| Palavras-Chave | #TRANSITION-METAL CARBIDES #CRYSTAL-STRUCTURE #TEMPERATURE #U2PTC2 #DEPENDENCE #SYSTEM #PHASE #PHYSICS, APPLIED #PHYSICS, CONDENSED MATTER |
| Tipo |
article original article publishedVersion |
