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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...
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When objects at different temperatures are placed in contact with each other but isolated from everything else, they attain thermal equilibrium. A container that prevents heat transfer in or out is called a calorimeter, and the use of a calorimeter to make measurements is called calorimetry. Generally, these measurements involve heat or specific heat capacity. The term "calorimetry problem" is used for any problem where the specified objects are thermally isolated from their...
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Calorimeters are useful to determine the heat released or absorbed by a chemical reaction. Coffee cup calorimeters are designed to operate at constant (atmospheric) pressure and are convenient to measure heat flow (or enthalpy change) accompanying processes that occur in solution at constant pressure. A different type of calorimeter that operates at constant volume, colloquially known as a bomb calorimeter, is used to measure the energy produced by reactions that yield large amounts of heat and...
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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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High-resolution calorimetry in pulsed magnetic fields.

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A new calorimeter measures thermodynamic properties in pulsed magnetic fields. This instrument enables high-resolution heat capacity measurements, advancing high-field thermodynamic studies.

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Area of Science:

  • Thermodynamics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Accurate measurement of thermodynamic properties under extreme conditions, such as high pulsed magnetic fields, is crucial for understanding exotic material phases.
  • Existing calorimetric techniques face challenges in achieving high resolution and field stability in pulsed magnetic fields.

Purpose of the Study:

  • To develop and validate a novel calorimeter capable of precise thermodynamic measurements in pulsed magnetic fields.
  • To demonstrate the calorimeter's performance using well-characterized and complex materials.

Main Methods:

  • Detailed description of the calorimeter's instrumental design and construction, including the RuO2 thermometer sensitivity.
  • Application of two measurement techniques: quasi-adiabatic and dual-slope methods for heat capacity determination.
  • Testing the calorimeter's performance by measuring heat capacity of pure germanium, CeCu2Ge2, and κ-(BEDT-TTF)2Cu[N(CN)2]Br up to 43.5 T.

Main Results:

  • Successful operation of the new calorimeter demonstrated through heat capacity measurements on three distinct samples.
  • Achieved high-resolution calorimetry in pulsed magnetic fields, highlighting the importance of field stability.
  • Validation of the calorimeter's capability for advanced high-field thermodynamic studies.

Conclusions:

  • The developed calorimeter is a significant advancement for high-resolution calorimetry in pulsed magnetic fields.
  • This new instrument opens up new avenues for exploring thermodynamic properties under extreme magnetic conditions.
  • The study confirms the calorimeter's potential for novel high-field material research.