2000/02/17 by E. V. Sampathkumaran, Sampathkumaran, E. V., Ramesh Chandra Mallik +7
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Materials Science (cond-mat.mtrl-sci) #Rare-earth and actinide compounds #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.cond-mat/0002275
6 pages (RevTex), 2 figures embedded, Physics Letters (in press)
arxiv created 2000/02/17 · openalex publication_date 2000/02/17 · arxiv updated 2009/11/30 · openalex created_date 2025/10/24 · openalex updated_date 2026/07/28
A closer look at the temperature (T) dependence of magnetoresistance (MR) of\ntwo polycrystalline magnetic compounds, LaMn2Ge2 and SmMn2Ge2,\npreviously reported by us, is made. A common feature for both these compounds\nis that the low temperature MR is positive (say, below, 30 K) in spite of the\nfact that both are ferromagnetic at such low temperatures; in addition, MR as a\nfunction of magnetic field (H) does not track magnetization (M) in the sense\nthat M saturates at low fields, while MR varies linearly with H. These\nobservations suggest that the magnetic layers interestingly do not dominate low\ntemperature magnetotransport process. Interestingly enough, as the T is\nincreased, say around 100 K, these magnetic layers dominate MR process as\nevidenced by the tracking of M and MR in SmMn2Ge2. These results tempts\nus to propose that there is an unusual "electronic separation" for MR process\nas the T is lowered in this class of compounds.\n