Unusual magnetic, thermal, and transport behavior of single-crystalline EuRh2As2
| Title | Unusual magnetic, thermal, and transport behavior of single-crystalline EuRh2As2 |
| Publication Type | Journal Article |
| Year of Publication | 2009 |
| Authors | Singh Y, Lee Y, Harmon BN, Johnston DC |
| Journal Title | Physical Review B |
| Volume | 79 |
| Pages | 220401 |
| Date Published | 06/01 |
| ISBN Number | 1098-0121 |
| Accession Number | ISI:000267699300003 |
| Keywords | antiferromagnetic 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 |
| Abstract | 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. |
| URL | <Go to ISI>://000267699300003 |
| DOI | 10.1103/Physrevb.79.220401 |
