Autor(es): Squillante, Lucas [UNESP] ; F. Mello, Isys [UNESP] ; O. Gomes, Gabriel ; Seridonio, A. C. [UNESP] ; Lagos-Monaco, R. E. [UNESP] ; Stanley, H. Eugene ; de Souza, Mariano [UNESP]
Data: 2020
Identificador Persistente: http://hdl.handle.net/11449/200419
Origem: Oasisbr
Made available in DSpace on 2020-12-12T02:06:09Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-12-01
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 (Bloc). 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) → 0 K and B → 0 T, such many-body contributions become ubiquitous. Here, employing the magnetic Grüneisen parameter (Γmag) 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 Bloc; ii) connection between the canonical definition of temperature and Γmag; and iii) possibility of performing adiabatic magnetization by only manipulating the mutual interactions. Our findings unveil unprecedented aspects emerging from the mutual interactions.
São Paulo State University (Unesp) IGCE - Physics Department
Department of Astronomy University of São Paulo
São Paulo State University (Unesp) Department of Physics and Chemistry
Boston University Department of Physics
São Paulo State University (Unesp) IGCE - Physics Department
São Paulo State University (Unesp) Department of Physics and Chemistry
