Kondo coupling induced charge gap in Ce[sub 3]Bi[sub 4]Pt[sub 3]
- IBM, Thomas J. Watson Research Center, Yorktown Heights, New York 10958 (United States)
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Measurements of the infrared reflectivity of the Kondo insulator Ce[sub 3]Bi[sub 4]Pt[sub 3] are reported. Near room temperature the charge dynamics are comparable to those of a heavy fermion compound in the incoherent regime; however, below 100 K the depletion of the low frequency conductivity singifies the development of a charge gap at low frequency ([similar to]300 cm[sup [minus]1]). The temperature dependence of the depleted spectral weight scales with the quenching of the Ce 4[ital f] moments, demonstrating that the gap formation is due to the local Kondo coupling of charge carriers to the Ce magnetic moments. The spectral weight which disappears as the gap forms must be displaced to energies much larger than the gap.
- OSTI ID:
- 5365883
- Journal Information:
- Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 72:4; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104* -- Metals & Alloys-- Physical Properties
ALLOY SYSTEMS
ALLOYS
BISMUTH ALLOYS
CESIUM ALLOYS
ENERGY GAP
INFRARED SPECTRA
INTERMETALLIC COMPOUNDS
KONDO EFFECT
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PLATINUM ALLOYS
PLATINUM METAL ALLOYS
REFLECTIVITY
SPECTRA
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TERNARY ALLOY SYSTEMS