Bibliographic Details
| Title: |
Thermodynamic Investigation of Metamagnetic Transitions and Partial Disorder in the Quasi-Kagome Kondo Lattice CePdAl |
| Authors: |
Mochidzuki, Kenji, Shimizu, Yusei, Kondo, Akihiro, Nakamura, Shota, Kittaka, Shunichiro, Kono, Yohei, Sakakibara, Toshiro, Ikeda, Yoichi, Isikawa, Yosikazu, Kindo, Koichi |
| Source: |
J. Phys. Soc. Jpn. 86, 034709 (2017) |
| Publication Year: |
2016 |
| Collection: |
Condensed Matter |
| Subject Terms: |
Condensed Matter - Strongly Correlated Electrons |
| More Details: |
Low-temperature ($T$) thermodynamic properties in magnetic fields ($B$) of the quasi-Kagome antiferromagnet CePdAl ($T_{\rm N}\sim$ 2.7 K) were studied by means of magnetization and specific-heat $C(T,B)$ measurements. The unusual magnetic phase diagram, including three thermodynamic phases I-III, and crossover anomalies, has been obtained. In low-field phase I, the existence of the partial Kondo screening state on the one-third Ce sites is supported from the thermodynamic point of view: (i) an appearance of the paramagnetic moment with one-third of the full moment around 3 T, and (ii) an occurrence of the entropy release $\sim$0.3$R$ln2 around the observed crossover. On the other hand, a strong enhancement of $C/T$ is found around the point, where $T_{\rm N}(B)$ meets the boundary of phase III, indicating the possible presence of a tri-critical point. Furthermore, it is suggested that the three metamagnetic transitions at $B_{{\rm m}i}$ ($i=$1,2,3) come from successive increments of the Ising-type magnetic moment along the $c$-axis. In high-field state above 20 T, the behavior of $f$ electron can be rather described by the crystal-electric-field model.
Comment: 6 pages, 5 figures |
| Document Type: |
Working Paper |
| DOI: |
10.7566/JPSJ.86.034709 |
| Access URL: |
http://arxiv.org/abs/1611.07679 |
| Accession Number: |
edsarx.1611.07679 |
| Database: |
arXiv |
