Heat capacity in magnetic and electric fields near the ferroelectric transition in triglycine sulfate

Title
Heat capacity in magnetic and electric fields near the ferroelectric transition in triglycine sulfate
Authors
Lashley, J.C.; Hundley, M.F.; Mihaila, B.; Smith, J.L.; Opeil, C.P.; Finlayson, T.R.; Fisher, R.A.; Hur, N.
Keywords
Specific-heat measurements, TGS
Issue Date
2007-01
Publisher
AMER INST PHYSICS
Abstract
Specific-heat measurements are reported near the Curie temperature (T-C=320 K) on triglycine sulfate. Measurements were made on crystals whose surfaces were either nongrounded or short circuited, and were carried out in magnetic fields up to 9 T and electric fields up to 220 V/cm. In nongrounded crystals the authors find that the shape of the specific-heat anomaly near T-C is thermally broadened. However, the anomaly changes to the characteristic sharp lambda shape expected for a continuous transition with the application of either a magnetic field or an electric field. In crystals whose surfaces were short circuited with gold, the characteristic lambda shape appeared in the absence of an external field. This effect enabled a determination of the critical exponents above and below T-C, and may be understood on the basis that the surface charge originating from the pyroelectric coefficient, dP/dT, behaves as if shorted by external magnetic or electric fields.
URI
http://dspace.inha.ac.kr/handle/10505/5922
ISSN
0003-6951
Appears in Collections:
College of Natural Science(자연과학대학) > Physics (물리학) > Journal Papers, Peports(물리학 학술논문, 보고서)
Files in This Item:
Heat.pdfDownload

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse