Strongly correlated Fermi systems as a new state of matter

doi:10.1007/s11467-016-0608-0

Front. Phys.

2016, Vol. 11

Issue (5) : 117103 https://doi.org/10.1007/s11467-016-0608-0

REVIEW ARTICLE

Strongly correlated Fermi systems as a new state of matter

V. R. Shaginyan^1,²(

),A. Z. Msezane²,G. S. Japaridze²,K. G. Popov³,V. A. Khodel^4,⁵

¹. Petersburg Nuclear Physics Institute, NRC Kurchatov 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 Centre Kurchatov Institute, Moscow, 123182, Russia
⁵. McDonnell Center for the Space Sciences & Department of Physics, Washington University, St. Louis, MO 63130, USA

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Abstract

The aim of this review paper is to expose a new state of matter exhibited by strongly correlated Fermi systems represented by various heavy-fermion (HF) metals, two-dimensional liquids like 3He, compounds with quantum spin liquids, quasicrystals, and systems with one-dimensional quantum spin liquid. We name these various systems HF compounds, since they exhibit the behavior typical of HF metals. In HF compounds at zero temperature the unique phase transition, dubbed throughout as the fermion condensation quantum phase transition (FCQPT) can occur; this FCQPT creates flat bands which in turn lead to the specific state, known as the fermion condensate. Unlimited increase of the effective mass of quasiparticles signifies FCQPT; these quasiparticles determine the thermodynamic, transport and relaxation properties of HF compounds. Our discussion of numerous salient experimental data within the framework of FCQPT resolves the mystery of the new state of matter. Thus, FCQPT and the fermion condensation can be considered as the universal reason for the non-Fermi liquid behavior observed in various HF compounds. We show analytically and using arguments based completely on the experimental grounds that these systems exhibit universal scaling behavior of their thermodynamic, transport and relaxation properties. Therefore, the quantum physics of different HF compounds is universal, and emerges regardless of the microscopic structure of the compounds. This uniform behavior allows us to view it as the main characteristic of a new state of matter exhibited by HF compounds.

Keywords quantum phase transition flat bands non-Fermi-liquid states strongly correlated electron systems quantum spin liquids heavy fermions quasicrystals thermoelectric and thermomagnetic effects scaling behavior new state of matter

Corresponding Author(s): V. R. Shaginyan

Issue Date: 17 October 2016

Cite this article:

V. R. Shaginyan,A. Z. Msezane,G. S. Japaridze, et al. Strongly correlated Fermi systems as a new state of matter[J]. Front. Phys. , 2016, 11(5): 117103.

URL:

https://academic.hep.com.cn/fop/EN/10.1007/s11467-016-0608-0
https://academic.hep.com.cn/fop/EN/Y2016/V11/I5/117103

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