Unusual Magnetic, Thermal, and Transport Behaviors of Single Crystal EuRh2As2

Details Unusual Magnetic, Thermal, and Transport Behaviors of Single Crystal EuRh2As2 Unusual Magnetic, Thermal, and Transport Behaviors of Single Crystal EuRh2As2

2009-02-02

arxiv.org/abs/0902.0352v1

Phys. Rev. B 79, 220401(R) (2009); 4 pages

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 6 figures

Scientific paper

10.1103/PhysRevB.79.220401

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 this is, 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 of 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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