2002/09/23 by D. Fournier, M. Poirier, M. Castonguay +2 · 3 citations
Materials Science · Mathematics · Physics and Astronomy · #Compressibility #Condensed matter physics #Critical point (mathematics) #Magnetism in coordination complexes #Mathematical analysis #Mathematics #Organic and Molecular Conductors Research #Phase (matter) #Phase diagram #Phase transition #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Thermodynamics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.90.127002
4 pages, 5 figures
arxiv created 2002/09/23 · openalex publication_date 2003/03/25 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The phase diagram of the organic superconductor \ensuremathκ\mathrm\text\ensuremath-(BEDT\mathrm\text\ensuremath-TTF)2Cu[N(CN)2]Cl has been investigated by ultrasonic velocity measurements under helium gas pressure. Different phase transitions were identified through several elastic anomalies characterized from isobaric and isothermal sweeps. Our data reveal two crossover lines that end on the critical point terminating the first-order Mott transition line. When the critical point is approached along these lines, we observe a dramatic anomaly of the sound velocity which is consistent with a diverging compressibility of the electronic degrees of freedom.