An anomalous magnetic phase transition at 10 K in Nd7Rh3

Sengupta, Kausik ; Sampathkumaran, E. V. (2006) An anomalous magnetic phase transition at 10 K in Nd7Rh3 Journal of Physics: Condensed Matter, 18 (31). L401-L406. ISSN 0953-8984

[img]
Preview
PDF - Author Version
487kB

Official URL: http://iopscience.iop.org/0953-8984/18/31/L03

Related URL: http://dx.doi.org/10.1088/0953-8984/18/31/L03

Abstract

The compound Nd7Rh3, crystallizing in a Th7Fe3-type hexagonal structure, has been shown recently by us to exhibit a signature of a 'magnetic phase-coexistence phenomenon' below 10 K after field cycling. This is uncharacteristic of stoichiometric intermetallic compounds, and bears a relevance to the trends in the field of 'electronic phase-separation'. In order to characterize this compound further, we have carried out dc magnetic susceptibility (χ), electrical resistivity, magnetoresistance and heat-capacity measurements as a function temperature (T = 1.8-300 K). The results reveal that this compound exhibits another unusual finding at the 10 K transition in the sense that the plot of χ(T) shows a sharp increase in the 'field-cooled' cycle, whereas the 'zero-field-cooled' curve shows a downturn below the transition. In addition, the sign of magnetoresistance is negative and the magnitude is large over a wide temperature range in the vicinity of the magnetic ordering temperature, with a sharp variation at 10 K. The results indicate that the transition below 10 K is first-order in its character.

Item Type:Article
Source:Copyright of this article belongs to Institute of Physics.
ID Code:92901
Deposited On:06 Jun 2012 13:48
Last Modified:19 May 2016 06:08

Repository Staff Only: item control page