NMR studies of single crystals of the topological insulator Bi2Te3 at low temperatures


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Аннотация

A powder sample and single-crystal plates of the topological insulator Bi2Te3 have been investigated using the 125Te NMR method at room temperature and at low temperatures in the range from 12.5 to 16.5 K. The NMR spectra of the single-crystal plates have been studied in the orientation where the crystallographic axis c is directed parallel or perpendicular to the magnetic field. The spectra have been obtained by means of recording spin-echo signals and plotting their envelopes. It has been shown that the NMR spectra for the bismuth telluride powder and plates with the orientation cB consist of two lines, which are presumably attributed to tellurium nuclei in two crystallographic positions in the bulk of the sample. The position and shape of the lines are determined by the chemical shift and the Knight shift. For the orientation of the plates c || B, the spectrum contains an additional component in the high-frequency region, which cannot appear due to the angular dependence of the line shifts caused by tellurium nuclei in the bulk of the topological insulator. At a low temperature, the additional line dominates in the spectrum.

Авторлар туралы

S. Naumov

Mikheev Institute of Metal Physics, Ural Branch

Email: charnaya@mail.ru
Ресей, ul. Sofii Kovalevskoi 18, Yekaterinburg, 620990

Yu. Perevozchikova

Mikheev Institute of Metal Physics, Ural Branch

Email: charnaya@mail.ru
Ресей, ul. Sofii Kovalevskoi 18, Yekaterinburg, 620990

V. Chistyakov

Mikheev Institute of Metal Physics, Ural Branch

Email: charnaya@mail.ru
Ресей, ul. Sofii Kovalevskoi 18, Yekaterinburg, 620990

E. Marchenkova

Mikheev Institute of Metal Physics, Ural Branch

Email: charnaya@mail.ru
Ресей, ul. Sofii Kovalevskoi 18, Yekaterinburg, 620990

H. Weber

Atominstitut—Institute of Atomic and Subatomic Physics

Email: charnaya@mail.ru
Австрия, Stadionallee 2, Vienna, 1020

J. Huang

National Cheng Kung University

Email: charnaya@mail.ru
Қытай республикасы, 1 University Road, Tainan City 701

V. Marchenkov

Mikheev Institute of Metal Physics, Ural Branch; Ural Federal University

Email: charnaya@mail.ru
Ресей, ul. Sofii Kovalevskoi 18, Yekaterinburg, 620990; ul. Mira 19, Yekaterinburg, 620002

A. Antonenko

St. Petersburg State University

Email: charnaya@mail.ru
Ресей, Universitetskaya nab. 7–9, St. Petersburg, 199034

E. Charnaya

St. Petersburg State University

Хат алмасуға жауапты Автор.
Email: charnaya@mail.ru
Ресей, Universitetskaya nab. 7–9, St. Petersburg, 199034

D. Nefedov

St. Petersburg State University

Email: charnaya@mail.ru
Ресей, Universitetskaya nab. 7–9, St. Petersburg, 199034

D. Podorozhkin

St. Petersburg State University

Email: charnaya@mail.ru
Ресей, Universitetskaya nab. 7–9, St. Petersburg, 199034

A. Uskov

St. Petersburg State University

Email: charnaya@mail.ru
Ресей, Universitetskaya nab. 7–9, St. Petersburg, 199034

A. Bugaev

Moscow Institute of Physics and Technology (State University)

Email: charnaya@mail.ru
Ресей, Institutskii per. 9, Dolgoprudnyi, Moscow oblast, 141700

M. Lee

National Cheng Kung University

Email: charnaya@mail.ru
Қытай республикасы, 1 University Road, Tainan City 701

L. Chang

National Cheng Kung University

Email: charnaya@mail.ru
Қытай республикасы, 1 University Road, Tainan City 701

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