Large Magnetovolume Effect Induced by Embedding Ferromagnetic Clusters into Antiferromagnetic Matrix of Cobaltite Perovskite

• DOI: 10.1002/adma.201605991
• Publication Date: 2017-05-08T12:26:48Z
• Authors: Ping Miao; Xiaohuan Lin; Akihiro Koda; Sanghyun Lee; Yoshihisa Ishikawa; Shuki Torii; Masao Yonemura; Takashi Mochiku; Hajime Sagayama; Shinichi Itoh; Kazutaka Ikeda; Toshiya Otomo; Yinxia Wang; Ryosuke Kadono; Takashi Kamiyama
• Keywords: Cobaltite; Phase boundary

Materials that show negative thermal expansion (NTE) have significant industrial merit because they can be used to fabricate composites whose dimensions remain invariant upon heating. In some materials, NTE is concomitant with the spontaneous magnetization due magnetovolume effect (MVE). Here authors report a new class of MVE material; namely, layered perovskite PrBaCo2 O5.5+x (0 ≤ x 0.41), in which strong [β ≈ -3.6 × 10-5 K-1 (90-110 K) at = 0.24] triggered by embedding ferromagnetic (F) clusters into antiferromagnetic (AF) matrix. The strongest found near boundary between F and AF phases phase diagram, indicating essential role competition F-clusters AF-matrix. Furthermore, not limited but also observed NdBaCo2 . present study provides approach obtaining offers path design materials.