块状非常规绝缘体SmB中的本征体量子振荡

Intrinsic Bulk Quantum Oscillations in a Bulk Unconventional Insulator SmB.

作者信息

Hartstein Máté, Liu Hsu, Hsu Yu-Te, Tan Beng S, Ciomaga Hatnean Monica, Balakrishnan Geetha, Sebastian Suchitra E

机构信息

Cavendish Laboratory, Cambridge University, Cambridge CB3 0HE, UK.

Department of Physics, University of Warwick, Coventry CV4 7AL, UK.

出版信息

iScience. 2020 Oct 1;23(11):101632. doi: 10.1016/j.isci.2020.101632. eCollection 2020 Nov 20.

DOI:10.1016/j.isci.2020.101632

PMID:33145482

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7593550/

Abstract

The finding of bulk quantum oscillations in the Kondo insulator SmB proved a considerable surprise. Subsequent measurements of bulk quantum oscillations in other correlated insulators including YbB lent support to our discovery of a class of bulk unconventional insulators that host bulk quantum oscillations. Here we perform a series of experiments to examine evidence for the intrinsic character of bulk quantum oscillations in floating zone-grown single crystals of SmB that have been the subject of our quantum oscillation studies. We present results of thermodynamic, transport, and composition analysis experiments on pristine floating zone-grown single crystals of SmB and compare quantum oscillations with metallic LaB and elemental aluminum. These results establish the intrinsic origin of quantum oscillations from the insulating bulk of floating zone-grown SmB. The similarity of the Fermi surface in insulating SmB with the conduction-electron Fermi surface in metallic hexaborides is at the heart of a theoretical mystery.

摘要

在近藤绝缘体SmB中发现体量子振荡着实令人相当意外。随后，在包括YbB在内的其他关联绝缘体中对体量子振荡进行的测量，为我们发现一类存在体量子振荡的体非常规绝缘体提供了支持。在此，我们开展了一系列实验，以检验在我们的量子振荡研究中一直作为研究对象的浮区生长SmB单晶中体量子振荡的本征特性证据。我们展示了对原始浮区生长SmB单晶进行的热力学、输运和成分分析实验结果，并将量子振荡与金属LaB和元素铝进行了比较。这些结果确定了来自浮区生长SmB绝缘本体的量子振荡的本征起源。绝缘SmB中的费米面与金属六硼化物中传导电子费米面的相似性是一个理论谜团的核心。