Magnetoresistance anomalies and multiple magnetic transitions in SmMn2Ge2

Sampathkumaran, E. V. ; Paulose, P. L. ; Mallik, R. (1996) Magnetoresistance anomalies and multiple magnetic transitions in SmMn2Ge2 Physical Review B: Condensed Matter and Materials Physics, 54 (6). R3710-R3713. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v54/i6/pR3710_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.54.R3710

Abstract

The results of magnetoresistance (Δρ/ρ), heat capacity (C), and ac susceptibility (χ) measurements are reported for a polycrystalline specimen of SmMn2Ge2. In addition to sharp variations of the order of 3-5% at 110 and 142 K, there are anomalies in the sign and the magnitudes of Δρ/ρ. A finding of considerable interest is that there is a gradual increase of Δρ/ρ from a small negative value at 35 K to a very large value of about 24% at 4.2 K in the presence of a magnetic field of 80 kOe, though apparently there is no corresponding anomaly in the C data. This finding signals the existence of a phase transition below 30 K attributable to magnetic ordering from Sm sublattice, thereby making the origin of the onset of Mn ordering around 110 K a puzzle.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:45634
Deposited On:28 Jun 2011 07:46
Last Modified:18 May 2016 01:50

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