Accession Number : AD0659181

Title :   THERMAL CONDUCTIVITY MEASUREMENTS OF EUO ACROSS THE CURIE POINT.

Descriptive Note : Technical rept.,

Corporate Author : SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY RAPID CITY DEPT OF PHYSICS

Personal Author(s) : Cason,John Ligon , Jr

Report Date : 01 OCT 1967

Pagination or Media Count : 85

Abstract : The investigation represents the first measurements of the thermal conductivity K of the magnetic semiconductor EuO. The measurements were carried out through the Curie point in the temperature range 55-300K. The sample used was a hot-pressed powder 90% EuO and 10% Eu2O3 2.9 mm diameter and 19 mm long. Values of K ranged from 14 mW/cm-deg at 260K to 24 mW/cm-deg at 96K to 22 mW/cm-deg at 64K with a sharp dip by a factor of four in the thermal conductivity near 69K. The results indicate the thermal conductivity is strongly affected by the ferromagnetic-paramagnetic transition, reported from specific heat measurements to be 69.3K. The results of the electrical resistivity of EuO gave values of about 3.5(10)9 ohm-cm at 61.5K and 1.4(10)9 ohm-cm at 297.2K. The resistivity decreases with increasing temperature as expected for a semiconductor. (Author)

Descriptors :   (*THERMAL CONDUCTIVITY, *EUROPIUM COMPOUNDS), (*SEMICONDUCTORS, THERMAL CONDUCTIVITY), MAGNETIC PROPERTIES, IRON, RODS, THESES, FERROMAGNETIC MATERIALS, ELECTRICAL RESISTANCE, SPECIFIC HEAT, PHONONS, TRANSITION TEMPERATURE, MONOXIDES, THEORY

Subject Categories : Solid State Physics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE