danДоклады Национальной академии наук БеларусиDoklady of the National Academy of Sciences of Belarus1561-83232524-2431The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"10.29235/1561-8323-2022-66-1-26-34dan-1034Research ArticleФИЗИКАPHYSICSЭлектрические свойства черного мышьякаElectric properties of black arsenicФедотоваЮ. А.FedotovaJ. A.

Федотова Юлия Александровна – доктор физико-математических наук, заместитель директора.

Ул. Бобруйская, 11, 220006, Минск

Fedotova Julia A. – D. Sc. (Physics and Mathematics), Deputy director.

11, Bobruiskaya Str., 220006, Minsk

Julia@hep.byНаучно-исследовательский Институт ядерных проблем, Белорусский государственный университетResearch Institute for Nuclear Problems, Belarusian State University2022090320226612634Copyright © Федотова Ю.А., 20222022Федотова Ю.А.Fedotova J.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://doklady.belnauka.by/jour/article/view/1034

Исследована структура, а также зависимости электрического сопротивления R(T) от температуры поликристалла природного черного мышьяка (b-As). Образцы b-As содержали как фазу черного мышьяка и следы его окисла, так и фазу серого мышьяка и арсенолита (As2O3). Поведение относительного магнетосопротивления MR(B) кристалла b-As при постоянной температуре описывалось соотношением MR(B) = bBn+ cBm, где коэффициенты b и с, а также показатели степени n и m определялись механизмами формирования магнетосопротивления и зависели от температуры. При температурах ниже 10 К зависимость MR(B) показывает наличие конкуренции отрицательного (при b < 0 и n ≈ 0,5) и положительного (при с > 0 и m ≈ 1) вкладов. При температуре T > 10 К наблюдался только ПМР эффект, для которого в диапазоне 10 < T < 100 К величины b > 0, n ≈ 1 и с → 0. При Т > 100 К величины b, с > 0, n ≈ 1 и 1,30 ≤ m ≤ 1,47. Наблюдаемое поведение зависимостей MR(B) в широком диапазоне температур обусловлено сильной неоднородностью и неупорядоченностью структуры исследуемого кристалла черного мышьяка.

R(T, B) of the natural black arsenic (b-As) polycrystal was studied. It was shown that the polycrystalline b-As sample contains the b-As phase and also the traces of its oxide, as well as grey arsenic and arsenolite (As2O3). The behavior of the relative magnetoresistance of the b-As crystal was described by the relation MR(B) = bBn + cBm, where the coefficients b and c and the exponents n and m were also affected by the mechanisms of magnetoresistance formation and temperature. At the temperatures below 10 K, MR(B) shows the presence of a competition between negative (with b < 0 and n ≈ 0.5) and positive (with c > 0 and m ≈ 1) contributions. Above 10 K, only the PMR effect was presented. For the PMR effect, at 10 < T < 100 K it is observed that the values of b > 0, n ≈ 1 and c → 0. Above 100 K, it is observed that the values of b, c > 0 and n ≈ 1 and 1.30 < m < 1.47. The observed behavior of the R(T, B) dependences is associated with strong inhomogeneity and/or disorder of the investigated black arsenic crystal.

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The authors declare that there are no conflicts of interest present.