A compact sample holder to perform thermoelectric power measurements on small, bulk samples in the temperature range of 300-15 K is designed and attached to a closed cycle refrigerator (CCR). Differential method is employed and copper is taken as the reference material. The temperature control as well as the data acquisition are automated.

Sankaranarayanan V

Department Of Physics

R. Nirmala

Kanikrishnan Sethupathi

CLOSED CYCLE MACHINERY

Copper

Cryostats

Data acquisition

Low temperature phenomena

Refrigerators

Temperature control

temperature measurement

CLOSED CYCLE REFRIGERATOR

DIFFERENTIAL METHOD

THERMOELECTRIC POWER MEASUREMENTS

Cryogenics

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IIT Madras

Automated thermoelectric power measurement from 300 to 15 K with a closed cycle refrigerator

We report our analysis of thermopower S (T) of Pr(0.7-x) Hox Sr0.3 Mn O3 (x=0, 0.04, 0.08, and 0.1) compounds within a percolative framework and correlate the results with the existence of a Griffiths phase. The Griffiths temperature, at which ferromagnetic metallic clusters nucleate above TC, is evaluated. We further show that the Griffiths phase extends over a higher temperature range above TC with increase in the variance of ionic radii of the A site. © 2005 American Institute of Physics.

Fulltext

Journal of Applied Physics

A -site dependent percolative thermopower and Griffiths phase in Pr (0.7-x)Ho xSr 0.3MnO 3 (x=0.0, 0.04, 0.08, and 0.1)

Solid State Communications

Phase transitions in PrCu2Ge2

Observation of heavy-fermion like behaviour and anomalous magnetism in a Pr-based metal

Proceedings of the Physical Society

Magnetic Brillouin Zone Effects in the Thermoelectric Power and Magnetoresistance of -manganese

Journal	Data powered by TypesetCryogenics
Publisher	Data powered by TypesetElsevier Science Ltd, Exeter
ISSN	00112275
Open Access	No