Publication

Critical fluctuations in the spin-orbit Mott insulator Sr3Ir2O7

2019
Journal Articles

Abstract

X-ray magnetic critical scattering measurements and specific heat measurements were performed on the perovskite iridate Sr3Ir2O7. We find that the magnetic interactions close to the Neel temperature T-N = 283.4(2) K are three-dimensional. This contrasts with previous studies which suggest two-dimensional behaviour like Sr2IrO4. Violation of the Harris criterion (d nu > 2) means that weak disorder becomes relevant. This leads a rounding of the antiferromagnetic phase transition at T-N, and modifies the critical exponents relative to the clean system. Specifically, we determine that the critical behaviour of Sr3Ir2O7 is representative of the diluted 3D Ising universality class.

Official source

https://infoscience.epfl.ch/entities/publication/ba65d139-7a33-4043-ac33-a003dbe7ab8b

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2019
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/ba65d139-7a33-4043-ac33-a003dbe7ab8b

About this result

Related concepts (32)

Curie temperature

In physics and materials science, the Curie temperature (TC), or Curie point, is the temperature above which certain materials lose their permanent magnetic properties, which can (in most cases) be replaced by induced magnetism. The Curie temperature is named after Pierre Curie, who showed that magnetism was lost at a critical temperature. The force of magnetism is determined by the magnetic moment, a dipole moment within an atom which originates from the angular momentum and spin of electrons.

Critical point (thermodynamics)

In thermodynamics, a critical point (or critical state) is the end point of a phase equilibrium curve. One example is the liquid–vapor critical point, the end point of the pressure–temperature curve that designates conditions under which a liquid and its vapor can coexist. At higher temperatures, the gas cannot be liquefied by pressure alone. At the critical point, defined by a critical temperature Tc and a critical pressure pc, phase boundaries vanish.

Critical exponent

Critical exponents describe the behavior of physical quantities near continuous phase transitions. It is believed, though not proven, that they are universal, i.e. they do not depend on the details of the physical system, but only on some of its general features. For instance, for ferromagnetic systems, the critical exponents depend only on: the dimension of the system the range of the interaction the spin dimension These properties of critical exponents are supported by experimental data.

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Critical fluctuations in the spin-orbit Mott insulator Sr3Ir2O7

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