Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2007-01-04
Appl.Phys.Lett.90:052910,2007
Physics
Condensed Matter
Statistical Mechanics
4 Pages, 4 Figures. To Appear in Applied Physics Letters_ January 2007
Scientific paper
10.1063/1.2435333
Specific-heat measurements are reported near the Curie temperature ($T_C$~= 320 K) on tri-glycine sulfate. Measurements were made on crystals whose surfaces were either non-grounded or short-circuited, and were carried out in magnetic fields up to 9 T and electric fields up to 220 V/cm. In non-grounded crystals we 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.
Finlayson T. R.
Fisher Russell A.
Hundley M. F.
Hur Namjung
Lashley J. C.
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