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ELECTRICAL RESISTIVITY

ELECTRICAL RESISTIVITY. Four Probe Method

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ELECTRICAL RESISTIVITY

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  1. ELECTRICAL RESISTIVITY Four Probe Method Electrical resistivity (ρ) measurements are carried out by the standard four-probe method over the temperature 8-300 K. Four platinum (Pt) electric leads are attached with silver paint/indium soldering on rectangular bar of specimens cut from sintered pellets with uniform cross section, as shown in Figure right side. ρis obtained from ρ= RA/L, where R is resistance, A is area of cross section, and L is length between voltage leads. Schematic diagram of resistivity measurement General Description Closed cycle refrigerator (CCR) systems provide a convenient means of cooling samples to temperatures below 10 K. CCR systems require no liquid nitrogen as a source of cooling. Instead, a closed loop of helium gas is compressed and expanded. The electrical resistivity system include the following components : cold head, gas lines, optional temperature controller, and compressor. Diagram of the Setup of Resistivity Measurement Pump RMC-Cryosystems Thermometer System Interconnections Prepare the sample Sample space CJ-LR 400 GPIB Adapter PC AT Program Control Data Output LR-400 Fore-Wire AC Resistance Bridge 7001 Switch System CTI-Cryogenics (MODEL 22) Experimental Results Electrical resistivity as a function of temperature for La2-xSrxCuO4 Electrical resistance as a function of temperature for LiTi2O4

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