Rare-earth (RE) elements are crucial in the advancement of high-temperature superconductors, ranging from the well-known RE-Ba-Cu-O (REBCO) cuprates to the recently discovered highpressure rare-earth polyhydrides. This theoretical study delves into the fundamental challenges

encountered when integrating rare-earth elements into superconducting lattices. We specifically address the inherent antagonism between the local magnetic moments of 4f electrons and the formation of Cooper pairs, the complexities involved in modeling highly correlated electronic states, and the stringent structural stability requirements for high-T_c phases. Through a comprehensive analysis of existing literature and advanced theoretical models, including the Abrikosov-Gorkov theory and Density Functional Theory (DFT) with Hubbard corrections (DFT+U), we pinpoint the critical factors that either limit or enhance superconductivity in these intricate systems. Our findings indicate that while non-magnetic rare-earth elements such as Lanthanum (La) and Yttrium (Y) facilitate the highest transition temperatures (T_c) in hydride systems, the magnetic rare-earth series offers a unique platform for exploring the coexistence of magnetism and superconductivity, despite presenting substantial theoretical and experimental hurdles. This paper aims to provide a foundational understanding of these challenges and propose future research directions to overcome them, ultimately contributing to the quest for room-temperature superconductivity..

The global expansion of mobile communication technologies has increased exposure to 

radiofrequency electromagnetic fields (RF‑EMF). Although RF radiation is categorized as 

non‑ionizing, growing experimental evidence suggests that prolonged exposure may influence 

biological systems through oxidative stress mechanisms (Dasdag & Akdag, 2016; Yakymenko 

et al., 2016). This study presents a literature‑based experimental model evaluating potential 

hematological and oxidative responses to chronic RF‑EMF exposure. Modeled data were 

derived from previously published experimental investigations examining mobile phone 

radiation in the 900–1800 MHz frequency range (Wang & Zhang, 2017; Kıvrak et al., 2017). 

Simulated exposure conditions included 6 hours of daily radiation for 60 consecutive days. 

Modeled results indicate reductions in erythrocyte indices and increased leukocyte counts, 

accompanied by elevated lipid peroxidation marker malondialdehyde (MDA) and decreased 

antioxidant enzymes superoxide dismutase (SOD), glutathione (GSH), and catalase (CAT). 

These patterns are consistent with mechanisms previously reported in experimental RF‑EMF 

studies (Zothansiama et al., 2017; Henschenmacher et al., 2022) and support oxidative 

imbalance as a central pathway underlying biological interaction with radiofrequency 

radiation.