Phase transition of a second kind in nickel as observed through optical reflection under pressure

Publication date: Available online 5 August 2019Source: Physics Letters AAuthor(s): Moris Sudai, Noaz Nissim, Shalom EliezerAbstractThe magnetic permeability of materials at optical frequencies is usually suggested in the literature to be μ=1. In this case one cannot expect to measure the magnetic second order phase transition at optical frequencies. The main novel idea of this paper is that the magnetic permeability μ is not equal to 1 for optical frequency and a phase transition of magnetism was measured experimentally with an optical frequency. In particular, this work presents the detection of a magnetic second order phase transition in nickel with temperature and at different pressures, by reflectivity measurements at an optical frequency. Based on our experiments the magnetic permeability is calculated as a function of temperature for pressures of 0.3, 5 and 10 GPa attained in a diamond anvil cell (DAC).

Source: Physics Letters A - August 6, 2019 Category: Physics Source Type: research