Magnetic Studies of Iron-Doped Probable Weyl Semimetal WTe 2

Condensed Matter

article

Andranik S. Khachatryan¹  Elena V. Charnaya¹  Marina V. Likholetova¹  Evgeniy V. Shevchenko¹  Min Kai Lee³  Lieh-Jeng Chang⁴  Sergey V. Naumov⁵  Alexandra N. Perevalova⁵  Elena B. Marchenkova⁵  Vyacheslav V. Marchenkov⁵ 

[1] Faculty of Physics, St. Petersburg State University;Faculty of Physics and Technology, Kuban State University;Instrument Center of Ministry of Science and Technology, National Cheng Kung University;Department of Physics, National Cheng Kung University;M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

关键词: type II Weyl semimetal;    iron-doped WTe2;    magnetic ordering;    metamagnetism;   

DOI  :  10.3390/condmat8010006

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

The non-trivial topology of electronic bands in Weyl semimetals originates from band inversion due to strong spin–orbit coupling. The Weyl semimetals have pairs of Weyl gap-less nodes in the bulk Brillouin zone. The tungsten ditelluride WTe2 likely belongs to type II Weyl semimetals. Doping WTe2 with magnetic ions could induce magnetic ordering in this crystal, which provides prospects for practical applications. We studied the magnetic properties of the iron-doped single crystals Fe0.03W0.97Te2, annealed and unannealed, in comparison with the undoped WTe2. Measurements of the dc magnetization were carried out from 1.8 to 400 K. We revealed pronounced ferromagnetic ordering that was affected by annealing. Anomalies associated with antiferromagnetism and paramagnetism were also found. The magnetic order was suppressed by a field of 60 kOe. The rise in susceptibility with increasing temperature was observed at high temperatures in all samples and was treated using a model developed for Weyl semimetals. The Curie–Weiss law fit at 60 kOe showed that the effective magnetic moment was close to that of Fe2+. Metamagnetism was demonstrated for the unannealed doped WTe2 crystal. The data for the heat capacity of the iron-doped sample agreed with results for the undoped WTe2.

【 授权许可】

CC BY