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Purcell, E.M. and Pound, R.V. (1951) A Nuclear Spin System at Negative Temperature. The Physical Review, 81, 279-280.
https://doi.org/10.1103/PhysRev.81.279

has been cited by the following article:

• TITLE: Kerr-Newman Black Holes and Negative Temperatures

  AUTHORS: Miguel Socolovsky

  KEYWORDS: Kerr-Newman Metric, Cauchy Horizon, Negative Temperature

  JOURNAL NAME: Journal of High Energy Physics, Gravitation and Cosmology, Vol.8 No.4, October 8, 2022

  ABSTRACT: The application of the Unruh procedure to the Rindler approximation of the Kerr-Newman metric in the neighborhood of the event and Cauchy horizons leads, unambiguously, to the well-known positive Hawking (black hole) temperature at the outer horizon, but to a negative (white hole) temperature at the inner horizon. Some consequences for the heat capacities and the status of the third law of thermodynamics are also discussed.