Antiferromagnetic-ferromagnetic crossover in La0.5Pr 0.5Mn2Si2 and its consequences on magnetoelastic and magnetocaloric properties
Physical Review B - Condensed Matter and Materials Physics, vol.78, no.14, 2008 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 78 Issue: 14
- Publication Date: 2008
- Doi Number: 10.1103/physrevb.78.144408
- Journal Name: Physical Review B - Condensed Matter and Materials Physics
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Ankara University Affiliated: Yes
Abstract
La0.5Pr0.5Mn2Si2 exhibits an antiferromagnetic-ferromagnetic transition caused by the crossover of the critical distance between Mn atoms on changing temperature. Applying a magnetic field in the antiferromagnetic state can cause a field-induced transformation to the ferromagnetic state at a critical field, which increases with decreasing temperature. We study here with magnetization and strain measurements the magnetic-field-induced strain associated with the field-induced transformation and magnetocaloric effects close to the transition temperature. We also examine the temperature dependence of the critical field and find from magnetization and ferromagnetic resonance measurements that short-range ferromagnetic correlation among the rare earth and Mn-sublattices occur at low temperatures. At low temperatures, this causes a decrease in the critical field for the crossover from antiferromagnetic to ferromagnetic coupling with decreasing temperature. © 2008 The American Physical Society.