Unusual high thermal conductivity in boron arsenide bulk crystals

作者：Tian, Fei; Song, Bai; Chen, Xi; Ravichandran, Navaneetha K.; Lv, Yinchuan; Chen, Ke; Sullivan, Sean; Kim, Jaehyun; Zhou, Yuanyuan; Liu, Te-Huan; Goni, Miguel; Ding, Zhiwei; Sun, Jingying; Gamage, Geethal Amila Gamage Udalamatta; Sun, Haoran; Ziyaee, Hamidreza; Huyan, Shuyuan; Deng, Liangzi; Zhou, Jianshi; Schmidt, Aaron J.; Chen, Shuo; Chu, Ching-Wu; Huang, Pinshane Y.; Broido, David^*; Shi, Li^*; Chen, Gang^*; Ren, Zhifeng^*

来源：Science, 2018, 361(6402): 582-+.

DOI：10.1126/science.aat7932

• DIAMOND

Conventional theory predicts that ultrahigh lattice thermal conductivity can only occur in crystals composed of strongly bonded light elements, and that it is limited by anharmonic three-phonon processes. We report experimental evidence that departs from these long-held criteria. We measured a local room-temperature thermal conductivity exceeding 1000 watts per meter-kelvin and an average bulk value reaching 900 watts per meter-kelvin in bulk boron arsenide (BAs) crystals, where boron and arsenic are light and heavy elements, respectively. The high values are consistent with a proposal for phonon-band engineering and can only be explained by higher-order phonon processes. These findings yield insight into the physics of heat conduction in solids and show BAs to be the only known semiconductor with ultrahigh thermal conductivity.

• 出版日期2018-8-10