Unveiling the Physics of the Mutual Interactions in Paramagnets

Author(s)

Squillante, Lucas ^[1] ; Mello, Isys F. ^[1] ; Gomes, Gabriel O. ^[2] ; Seridonio, A. C. ^[3] ; Lagos-Monaco, R. E. ^[1] ; Stanley, H. Eugene ^[4] ; de Souza, Mariano ^[1]

Affiliation

^[1] Sao Paulo State Univ Unesp, IGCE Phys Dept, Rio Claro, SP - Brazil

^[2] Univ Sao Paulo, Dept Astron, BR-05508090 Sao Paulo, SP - Brazil

^[3] Sao Paulo State Univ UNESP, Dept Phys & Chem, Ilha Solteira, SP - Brazil

^[4] Boston Univ, Dept Phys, Boston, MA 02215 - USA

• Document type: Journal article
• Source: SCIENTIFIC REPORTS; v. 10, n. 1 MAY 14 2020.
• Web of Science Citations: 0

Abstract

In real paramagnets, there is always a subtle many-body contribution to the system's energy, which can be regarded as a small effective local magnetic field (B-loc). Usually, it is neglected, since it is very small when compared with thermal fluctuations and/or external magnetic fields (B). Nevertheless, as both the temperature (T) -> 0K and B -> 0T, such many-body contributions become ubiquitous. Here, employing the magnetic Gruneisen parameter (Gamma (mag)) and entropy arguments, we report on the pivotal role played by the mutual interactions in the regime of ultra-low-T and vanishing B. Our key results are: i) absence of a genuine zero-field quantum phase transition due to the presence of B-loc; ii) connection between the canonical definition of temperature and Gamma (mag); and iii) possibility of performing adiabatic magnetization by only manipulating the mutual interactions. Our findings unveil unprecedented aspects emerging from the mutual interactions. (AU)

• FAPESP's process: 11/22050-4 - Exploring thermodynamic and transport properties of strongly correlated electron systems
• Grantee: Valdeci Pereira Mariano de Souza
• Support Opportunities: Regular Research Grants