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

Science China(Physics,Mechanics & Astronomy) 2022年第3期65卷 99-105页

作者： Tian Le LiQiang Che Qi Huang Kevin Huang ZhaoFeng Ding Lei Shu Xin Lu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Center for Correlated Matter and Department of Physics Zhejiang UniversityHangzhou 310058China State Key Laboratory of Surface Physics Department of PhysicsFudan UniversityShanghai 200433China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China Zhejiang Province Key Laboratory of Quantum Technology and Device Zhejiang UniversityHangzhou 310027China

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.

关键词： point-contact spectroscopy(PCS) hidden order heavy fermion Fermi surface gapping

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Hybridization Induced Competitive Scanning Tunneling Interference Process into a Heavy Fermion System

引用

Chinese Physics Letters 2018年第7期35卷 110-113页

作者：羊富彬 Department of Physics College of Computer Civil Aviation Flight University of China

We theoretically present the results for a scanning interference tunneling process between a metallic tip and a heavy fermion system. The density of states（DOS） and the differential conductance at zero temperature under different c-f band hybridizations, as well as the interference Fano ratio strength in the heavy fermion system,are calculated. It is found that the hybridization strength gives rise to the splitting effect in the DOS around the Fermi energy. Also the interference Fano ratio strength makes the differential conductance characteristics strongly asymmetric.

关键词： DOUBLE-QUANTUM DOTS hidden order SUPERCONDUCTIVITY TRANSPORT LATTICE GAP

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