Observation of large positive magnetoresistance and its sign reversal in GdRhGe

Sachin Gupta; K. G. Suresh; A. K. Nigam

doi:10.1016/j.jallcom.2013.10.123

Observation of large positive magnetoresistance and its sign reversal in GdRhGe

Sachin Gupta, K. G. Suresh, A. K. Nigam

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

Abstract

Magnetic properties, heat capacity and magnetoresistance (MR) of polycrystalline GdRhGe are investigated. It shows two antiferromagnetic transitions, one at T₁ = 31.8 K and the other at T₂ = 24 K, and field induced metamagnetic transition over a wide temperature range. The ac susceptibility data reveal that the transition at 24 K is not simple antiferromagnetic. Dominant contributions to the heat capacity and the resistivity have been identified. MR is found to show sign reversal just below T₁ and attains a large positive value of 48% at 2 K for 50 kOe. Like MR, the isothermal magnetic entropy change also undergoes a sign reversal as the temperature is varied, indicating a change of the magnetic structure and the moment amplitude in determining these properties.

Original language	English
Pages (from-to)	600-604
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	586
DOIs	https://doi.org/10.1016/j.jallcom.2013.10.123
Publication status	Published - 2014 Jan 1

Keywords

Antiferromagnet
Magnetocaloric effect
Magnetoresistance
Metamagnetic transition

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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abstract = "Magnetic properties, heat capacity and magnetoresistance (MR) of polycrystalline GdRhGe are investigated. It shows two antiferromagnetic transitions, one at T1 = 31.8 K and the other at T2 = 24 K, and field induced metamagnetic transition over a wide temperature range. The ac susceptibility data reveal that the transition at 24 K is not simple antiferromagnetic. Dominant contributions to the heat capacity and the resistivity have been identified. MR is found to show sign reversal just below T1 and attains a large positive value of 48% at 2 K for 50 kOe. Like MR, the isothermal magnetic entropy change also undergoes a sign reversal as the temperature is varied, indicating a change of the magnetic structure and the moment amplitude in determining these properties.",

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AU - Gupta, Sachin

AU - Suresh, K. G.

AU - Nigam, A. K.

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N2 - Magnetic properties, heat capacity and magnetoresistance (MR) of polycrystalline GdRhGe are investigated. It shows two antiferromagnetic transitions, one at T1 = 31.8 K and the other at T2 = 24 K, and field induced metamagnetic transition over a wide temperature range. The ac susceptibility data reveal that the transition at 24 K is not simple antiferromagnetic. Dominant contributions to the heat capacity and the resistivity have been identified. MR is found to show sign reversal just below T1 and attains a large positive value of 48% at 2 K for 50 kOe. Like MR, the isothermal magnetic entropy change also undergoes a sign reversal as the temperature is varied, indicating a change of the magnetic structure and the moment amplitude in determining these properties.

AB - Magnetic properties, heat capacity and magnetoresistance (MR) of polycrystalline GdRhGe are investigated. It shows two antiferromagnetic transitions, one at T1 = 31.8 K and the other at T2 = 24 K, and field induced metamagnetic transition over a wide temperature range. The ac susceptibility data reveal that the transition at 24 K is not simple antiferromagnetic. Dominant contributions to the heat capacity and the resistivity have been identified. MR is found to show sign reversal just below T1 and attains a large positive value of 48% at 2 K for 50 kOe. Like MR, the isothermal magnetic entropy change also undergoes a sign reversal as the temperature is varied, indicating a change of the magnetic structure and the moment amplitude in determining these properties.

KW - Antiferromagnet

KW - Magnetocaloric effect

KW - Magnetoresistance

KW - Metamagnetic transition

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