Volume 106, Number 3, May 2014
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||05 May 2014|
General properties of phase diagrams of heavy-fermion metals
1 Petersburg Nuclear Physics Institute - Gatchina, 188300, Russia
2 Clark Atlanta University - Atlanta, GA 30314, USA
3 Komi Science Center, Ural Division, RAS - Syktyvkar, 167982, Russia
4 Russian Research Center Kurchatov Institute - Moscow, 123182, Russia
5 McDonnell Center for the Space Sciences & Department of Physics, Washington University St. Louis, MO 63130, USA
Received: 26 March 2014
Accepted: 15 April 2014
We study the temperature-magnetic field T-B phase diagrams of heavy-fermion (HF) metals, and show that at sufficiently high temperatures outside the ordered phase the crossover temperature , regarded as the energy scale, follows a linear B-dependence, crossing the origin of the T-B phase diagram. This behavior of constitutes the general property, and is formed by the presence of the fermion condensation quantum phase transition hidden within the ordered phase. Our result is in good agreement with the experimental T-B phase diagram of the HF metals YbRh2Si2, Yb(Rh0.93Co0.07)2Si2, and Yb(Rh0.94Ir0.06)2Si2. To support our observations, we analyze the isothermal magnetization M, and demonstrate that exhibits a universal temperature behavior over magnetic field scaling. The obtained results are in good agreement with the corresponding data collected on YbRh2Si2 as a function of the magnetic field at different temperatures under hydrostatic pressure.
PACS: 71.10.Hf – Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems / 64.70.Tg – Quantum phase transitions / 71.27.+a – Strongly correlated electron systems; heavy fermions
© EPLA, 2014
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