Superconductivity under pressure in linear chalcogenides
| Autor: | M. Jaime, Pierre Monceau, D. Castello, Manuel Núñez-Regueiro, J.-M. Mignot |
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| Rok vydání: | 1993 |
| Předmět: |
Superconductivity
Condensed matter physics Chemistry Mechanical Engineering Transition temperature Metals and Alloys Pressure dependence Condensed Matter Physics Electronic Optical and Magnetic Materials Mechanics of Materials Electrical resistivity and conductivity Materials Chemistry Pressure derivative Charge density wave P-variation Ambient pressure |
| Zdroj: | Synthetic Metals. 56:2653-2659 |
| ISSN: | 0379-6779 |
| DOI: | 10.1016/0379-6779(93)90013-m |
| Popis: | We have measured the electrical resistivity of several quasi 1-D chalcogenides between 1.2 and 300K and from ambient pressure up to 25GPa. On NbSe 3 we find that the high temperature charge density wave (CDW) transition T 1 disappears at a pressure of about 3.5GPa, where the superconducting transition temperature T c jumps to ∼5K. The similar pressure dependence of the logarithmic pressure derivative of both T 1 and T c above this pressure suggests the existence of independent superconducting states. On m-TaS 3 we observe a maximum on the T 1 -P variation at ∼3.5GPa, that we attribute to a CDW transition temperature strongly diminished by 1-D fluctuations that are reduced at low applied pressures, with T 2 behaving in a monotonous decreasing way with pressure. While on o-TaS 3 the CDW that develops at 210K at ambient pressure, gives way to a superconducting state of T c ∼3K at a pressure of 6.5GPa. The behaviour of (TaSe 4 ) 2 I is scaled to the precedent, with a higher critical pressure of 15GPa that induces the appearance of a superconducting state with T c =2.5K. |
| Databáze: | OpenAIRE |
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