Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1623688 | Journal of Alloys and Compounds | 2009 | 5 Pages |
Abstract
We investigated the effect of uniaxial and hydrostatic pressure on resistivity and ac-magnetic susceptibility of two-dimensional layered manganite, La1.25Sr1.75Mn2O7 (LSMO125) to investigate the lattice effect on magnetic and electronic properties. Asymmetric role of uniaxial pressure, || and ⥠to c-axis on the spin flop and charge transport has been revealed while comparing hydrostatic pressure. Uniaxial pressure along c-axis increases metal-insulator transition temperature (TMI) and ferromagnetic ordering temperature (TC), whereas it decreases the resistivity along ab-plane (Ïab). In contrast to pressure along c-axis, TMI and TC decrease, whereas the resistivity along c-axis (Ïc) increases with pressure || to ab-plane. Ïc/Ïab is quite large, increasing with pressure and shows a peak at around TMI. Uniaxial pressure behaviour is strongly related to the Mn-O-Mn linkage between MnO2 layers and the spin reorientation from the apical axis to the basal plane and vice versa with pressure. Both Ïab and Ïc decrease whereas TMI and TC increases under hydrostatic pressure. Influence of spin and charge on magnetic and electrical properties under hydrostatic pressure are explained by pressure-induced cant between the MnO2 bilayers and variation in bond lengths. The different pressure driving rates of TMI while measuring Ïab and Ïc confirms that there is a strong competition between the in and out plane components under hydrostatic pressure.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
K. Mydeen, S. Arumugam, D. Prabhakaran, R.C. Yu, C.Q. Jin,