Intrinsic insulating transport characteristics in low-carrier density EuCd2As2 films

Author:

Nishihaya Shinichi1ORCID,Nakamura Ayano1ORCID,Ohno Mizuki2ORCID,Kriener Markus3ORCID,Watanabe Yuto1ORCID,Kawasaki Masashi23ORCID,Uchida Masaki1ORCID

Affiliation:

1. Department of Physics, Tokyo Institute of Technology 1 , Tokyo 152-8551, Japan

2. Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), The University of Tokyo 2 , Tokyo 113-8656, Japan

3. RIKEN Center for Emergent Matter Science (CEMS) 3 , Wako 351-0198, Japan

Abstract

Searching for an ideal magnetic Weyl semimetal hosting only a single pair of Weyl points has been a focal point for systematic clarification of its unique magnetotransport derived from the interplay between topology and magnetization. Among the candidates, triangular-lattice antiferromagnet EuCd2As2 has been attracting special attention due to the prediction of the ideal Weyl semimetal phase in the ferromagnetic state; however, transport properties of low-carrier density samples have remained elusive. Here, we report molecular beam epitaxy growth of EuCd2As2 films, achieving low-hole density in the range of 1015–1016 cm−3 at low temperature. Transport measurements of such low-carrier density films reveal an insulating behavior with an activation gap of about 200 meV, which persists even in the field-induced ferromagnetic state. Our work provides an important experimental clue that EuCd2As2 is intrinsically insulating, contrary to the previous prediction.

Funder

Fusion Oriented REsearch for disruptive Science and Technology

Ministry of Education, Culture, Sports, Science and Technology

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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