Fermi surface gapping in the hidden order state of PrFe_(4)P_(12);by point-contact spectroscopy

作     者：Tian Le LiQiang Che Qi Huang Kevin Huang ZhaoFeng Ding Lei Shu Xin Lu Tian Le;LiQiang Che;Qi Huang;Kevin Huang;ZhaoFeng Ding;Lei Shu;Xin Lu

作者机构：Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China Center for Correlated Matter and Department of PhysicsZhejiang UniversityHangzhou 310058China State Key Laboratory of Surface PhysicsDepartment of PhysicsFudan UniversityShanghai 200433China Collaborative Innovation Center of Advanced MicrostructuresNanjing 210093China Zhejiang Province Key Laboratory of Quantum Technology and DeviceZhejiang UniversityHangzhou 310027China 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2022年第65卷第3期

页      面：99-105页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0702[理学-物理学] 

基　　金：supported by National Key R&D Program of China(Grant Nos.2017YFA0303101,and 2016FYA0300402) the National Natural Science Foundation of China(Grant Nos.12174333,and 11674279) the support by the National Natural Science Foundation of China(Grant No.11474060) Shanghai Municipal Science and Technology(Grant Nos.2019SHZDZX01,and 20ZR1405300) support from the Zhejiang Provincial Natural Science Foundation of China(Grant No.LR18A04001) the Key R&D Program of Zhejiang Province,China(Grant No.2021C01002) 

主　　题：point-contact spectroscopy(PCS) hidden order heavy fermion Fermi surface gapping 

摘      要：We have applied point-contact spectroscopy(PCS) to investigate the nonmagnetic hidden order(HO) state of the skutterudite compound PrFe_(4)P_(12) with its transition temperature THO~6.5 K. Its point-contact conductance curves exhibit a reproducible gap structure in the HO state below THOand its temperature dependent gap magnitude follows a BCS-like mean-field behavior.A Fano-like conductance shape is observed to emerge below the coherence temperature of PrFe_(4)P_(12). In a magnetic field, the gap feature is gradually suppressed and evolves into a pronounced Fano peak, signaling the heavy fermion state and vividly demonstrating the competition between HO and the formation of heavy fermion states. Our results strongly suggest the itinerant characteristic of f electrons in PrFe_(4)P_(12), which constrains theoretical models to explain the HO mechanism.