ELECTRICAL RESISTIVITY
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ELECTRICAL RESISTIVITY. Four Probe Method

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ELECTRICAL RESISTIVITY

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Electrical resistivity

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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