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- Sérgio Augusto Machado da Gama, A. Grupen J. A. Coelho, +4 authors Nilson A de Oliveira
- Physical review letters
- 2004

To present day, the maximum magnetocaloric effect (MCE) at room temperature for a magnetic field change of 5 T is 40 J/(kg K) for MnAs. In this Letter we present colossal MCE measurements on MnAs under pressure, reaching values up to 267 J/(kg K), far greater than the magnetic limit arising from the assumption of magnetic field independence of the lattice… (More)

- Manuel Simões, Ariana de Campos
- Physical review. E, Statistical, nonlinear, and…
- 2004

Through a mean field theory, an elastic free energy describing the nonuniform elastic textures observed in nematic elastomers, is proposed. To construct it, an order parameter that describes the nematic-isotropic phase transition through the change of the elastic properties of the strain tensor at the transition point is introduced. The resulting elastic… (More)

- Ariana de Campos
- IEEE Transactions on Nuclear Science
- 1984

A commercial available Schottky barrier silicon photodiode is coupled to a Gas Proportional Scintillation Counter through a quartz window and is used as an alpha particle room temperature detector. An Ar+N2(2%) gas mixture at 1470 Thrr is used. Resolutions of 3.2% are achieved. A discussion of the results obtained is presented and future improvements… (More)

- Manuel Simões, A. J. Palangana, Anderson Reginaldo Sampaio, Ariana de Campos, Kikuji Yamaguti
- Physical review. E, Statistical, nonlinear, and…
- 2005

In this work, the effective viscosity of the cholesteryl myristate and cholesteryl nonanoate liquid crystals is studied as a function of temperature at the region of their cholesteric-to-isotropic phase transition, where blue phases are found. Using a change of scale it is shown that the viscosity peaks that characterize these phase transitions are shape… (More)

- Ariana de Campos, Daniel L Rocco, +9 authors Nilson A de Oliveira
- Nature materials
- 2006

The magnetocaloric effect (MCE) is the basis for magnetic refrigeration, and can replace conventional gas compression technology due to its superior efficiency and environment friendliness. MCE materials must exhibit a large temperature variation in response to an adiabatic magnetic-field variation and a large isothermal entropic effect is also expected. In… (More)

- Manuel Simões, Ariana de Campos, D. M. L. Barbato
- Physical review. E, Statistical, nonlinear, and…
- 2007

In this paper, the affine connection approach [D. Baalss and S. Hess, Phys. Rev. Lett. 57, 86 (1986)] will be defined in terms of a local transformation. Accordingly, the macroscopic anisotropy of the nematic medium will be conceived as resulting from a local transformation where, at each point of the sample, the spherical molecules of an idealized… (More)

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