Optical Determination Of The Thermodynamic Phase Diagram Of A Metamagnet

William C. Egbert

doi:10.1117/12.955556

19 October 1977 Optical Determination Of The Thermodynamic Phase Diagram Of A Metamagnet

William C. Egbert

Proceedings Volume 0112, Optical Polarimetry: Instrumentation and Applications; (1977) https://doi.org/10.1117/12.955556
Event: 21st Annual Technical Symposium, 1977, San Diego, United States

Abstract

Ferrous chloride is an antiferromagnet (AF) below its Neel temperature TN, but it may be driven into a saturated paramagnetic (SP) state by an external magnetic field applied along the c-axis. This AF-SP transition is first order below and continuous above a tricritical temperature Tc, a classic example of metamagnetism. With a pulsed dye laser, piezoelectric modulator, and a unique gated amplifier, we monitored the scattering of circularly polarized light by the mixed AF-SP phase below Tc. Above Tc the optical density of a sharp absorption line changes with the spin ordering; because the transition couples to spin fluctuations, the optical density maximizes in the SP phase. We have used these optical techniques to map the thermodynamic phase diagrams of FeC12 and FeC12 doped with cadmium, which to our knowledge is the first study of a randomly disordered critical system.

Citation Download Citation

William C. Egbert "Optical Determination Of The Thermodynamic Phase Diagram Of A Metamagnet", Proc. SPIE 0112, Optical Polarimetry: Instrumentation and Applications, (19 October 1977); https://doi.org/10.1117/12.955556

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available