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Abstract:
Low-temperature phase transitions and the associated quantum critical
points are a major field of research, but one in which experimental
information about thermodynamics is sparse. Thermodynamic information is
vital for the understanding of quantum many-body problems. We show that
combining measurements of the magnetocaloric effect and specific heat
allows a comprehensive study of the entropy of a system. We present a
quantitative measurement of the entropic landscape of Sr3Ru2O7, a
quantum critical system in which magnetic field is used as a tuning
parameter. This allows us to track the development of the entropy as the
quantum critical point is approached and to study the thermodynamic
consequences of the formation of a novel electronic liquid crystalline
phase in its vicinity.
