title: Note: Inverted heat pulse method to measure heat capacity during cooling: A counterpart of conventional quasi-adiabatic heat pulse method.
abstract: A simple method to extract known amount of heat from a sample within a given time interval has been proposed. Using this method, which we call inverted heat pulse (IHP) method, absolute values of heat capacity (C(P)) during cooling can be measured in a manner similar to conventional quasi-adiabatic heat pulse method of measuring C(P) during warming. Absolute accuracy of the measured C(P) using IHP method is found to be better than 2% in the temperature range 100-300 K. Applicability of this method to a broad and hysteretic first order transition is tested by measuring C(P) of Rh doped FePt sample, which shows a antiferromagnetic to ferromagnetic first order transition with a transition width of ∼35 K and hysteresis of ∼6 K. The peak value of the measured C(P) using IHP during cooling as well as entropy change calculated from measured data is found to be in good agreement with that measured during warming using conventional quasi-adiabatic heat pulse method.
authors.affiliation: UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, India.
authors.forename: Pallab
authors.initials: P
authors.lastname: Bag
authors.affiliation: UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, India.
authors.forename: Vikram
authors.initials: V
authors.lastname: Singh
authors.affiliation: UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, India.
authors.forename: R
authors.initials: R
authors.lastname: Rawat