Observation of pseudogap in underdoped Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8+[delta]] by tunneling spectroscopy

Conference · Sun Dec 20 04:00:00 EST 1998 · International Journal of Modern Physics B

OSTI ID:6384819

Gupta, A K; Ng, K W ^[1]

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1. Univ. of Kentucky, Lexington, KY (United States). Dept. of Physics and Astronomy

The authors have performed tunneling measurements on underdoped and optimally doped single crystals of Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8+[delta]] (Bi2212). The tunneling is in the ab-plane, in the maximum gap direction for all of the experiments. Measurement temperature ranges from 4.2 K to well above 100 K. The superconducting gap has been measured for T < [Tc]. 2[Delta]/k[Tc] for underdoped Bi2212 ([approximately]13.4) is significantly larger than that of optimally doped Bi2212 ([approximately]8.8). As the temperature is raised above [Tc], the gap vanishes for the optimally doped sample. In contrary, the gap like feature for the underdoped Bi2212 persists with larger gap value at higher temperatures. There are interesting differences in the nature of superconducting gap and pseudogap.

• OSTI ID: 6384819
• Report Number(s): CONF-980291--
• Conference Information: Journal Name: International Journal of Modern Physics B Journal Volume: 12:29-31
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
&amp; Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY GAP
MATERIALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE