Helical magnetic ordering studied in single-crystalline <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>GdBe</mml:mi><mml:mn>13</mml:mn></mml:msub></mml:math>

• Hidaka, Hiroyuki

• Mizuuchi, Kota

• Hayasaka, Eikai

• Yanagisawa, Tatsuya

• Ohara, Jun

• Amitsuka, Hiroshi

書誌事項

タイトル別名

• Helical magnetic ordering studied in single-crystalline GdBe13

抄録

The beryllide GdBe13 with the NaZn13-type face-centered-cubic structure has been known to undergo a proper helical-magnet ordering from experimental studies using polycrystalline samples. In the present study, we carried out electrical resistivity, specific heat, and magnetization measurements of single-crystalline GdBe13 in order to investigate a mechanism of its helical ordering. These measurements reveal that the present compound is a metallic system exhibiting the magnetic ordering of local Gd3+ moments at T-N = 24.8 K accompanied with strong magnetic fluctuations extending to temperatures well above T-N. Furthermore, we constructed a magnetic field-temperature (B-T) phase diagram for B parallel to [001]. It consists of a multidomain state, which is composed of magnetic structures with B applied parallel and perpendicular to the helical plane, in the lower-magnetic-field region below similar to 0.45 T and a possible single-domain conical one in the higher-field region in the ordering state. The helical structure of GdBe(13 )characterized by an incommensurate ordering vector q(0) of (0, 0, 0.285) is discussed on the basis of a competition of Heisenberg exchange interactions between the Gd3+ moments assuming an one-dimensional layer crystal. The sequential change in the exchange interactions determined by a mean-field (MF) calculation can be essentially understood by the Ruderman-Kittel-Kasuya-Yosida interaction via anisotropic Fermi surfaces, whereas the orientation of the magnetic moments will be determined by the dipole-dipole interaction. On the other hand, the MF theory predicts a much smaller critical field B-c than the experimentally obtained one. To discuss the deviation of B-c from the MF calculation, we show a possibility of a fluctuation-induced first-order transition.

収録刊行物

• Physical Review B

  Physical Review B 102 (17), 174408-, 2020-11-06

  American Physical Society (APS)

詳細情報

• CRID: 1050850490525645952
• NII論文ID: 120006943562
• DOI: 10.1103/physrevb.102.174408
• ISSN: 24699969
• ISSN: 24699950
• HANDLE: 2115/80011
• Web Site: https://link.aps.org/article/10.1103/PhysRevB.102.174408
• Web Site: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.102.174408/fulltext
• 本文言語コード: en
• 資料種別: journal article
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