Unusual magnetic, thermal, and transport behavior of single-crystalline EuRh2As2

TitleUnusual magnetic, thermal, and transport behavior of single-crystalline EuRh2As2
Publication TypeJournal Article
Year of Publication2009
AuthorsSingh Y, Lee Y, Harmon BN, Johnston DC
Journal TitlePhysical Review B
Date Published06/01
ISBN Number1098-0121
Accession NumberISI:000267699300003
Keywordsantiferromagnetic materials, arsenic alloys, band structure, eu, europium alloys, fermi level, hall effect, high-temperature effects, magnetic transitions, order, rhodium alloys, specific heat, thermal magnetoresistance, valence

An antiferromagnetic transition is observed in single-crystal EuRh2As2 at a high temperature T-N=47 K compared to the ferromagnetic Weiss temperature theta=12 K. We show that the large ratio T-N/vertical bar theta vertical bar approximate to 4 is, perhaps surprisingly, consistent with mean-field theory. A first-order field-induced magnetic transition is observed at T < T-N with an unusual temperature dependence of the transition field. A dramatic magnetic field-induced reduction in the electronic specific heat coefficient at 1.8-5.0 K by 38% at 9 T is observed. In addition, a strong positive magnetoresistance and a large change in the Hall coefficient occur below 25 K. Band structure calculations indicate that the Fermi energy lies on a steep edge of a narrow peak in the density of states.

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