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Arthur P. Ramirez
Researcher at University of California, Santa Cruz
Publications - 250
Citations - 22795
Arthur P. Ramirez is an academic researcher from University of California, Santa Cruz. The author has contributed to research in topics: Magnetic susceptibility & Superconductivity. The author has an hindex of 69, co-authored 245 publications receiving 21317 citations. Previous affiliations of Arthur P. Ramirez include Oregon State University & Columbia University.
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Low temperature magnetoresistance and the magnetic phase diagram of La1-xCaxMnO3.
TL;DR: An unexpectedly large magnetoresistance is seen at low temperatures in the FM phase, and is largely attributed to unusual domain wall scattering.
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Optical Response of High-Dielectric-Constant Perovskite-Related Oxide
TL;DR: Optical conductivity measurements on the perovskite-related oxide CaCu3Ti4O12 provide a hint of the physics underlying the observed giant dielectric effect in this material, suggesting the presence of a strong absorption at very low frequencies due to dipole relaxation.
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Strongly Geometrically Frustrated Magnets
TL;DR: The study of cooperative phenomena in magnetism has provided fertile ground for testing theories of interacting systems that possess different spatial dimensions, ranges, and sign of interactions, and that exhibit local anisotropy of the basic interacting unit, the magnetic spin this paper.
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Giant dielectric constant response in a copper-titanate
Arthur P. Ramirez,Munirpallam A. Subramanian,Margaret L. Gardel,Girsh Blumberg,Der-Chiang Li,Thomas Vogt,S. M. Shapiro +6 more
TL;DR: In this paper, the authors describe a material, cubic CaCu 3 Ti 4 O 12, which exhibits a large dielectric response, the temperature-dependence of which has not been seen, to our knowledge, in any existing material.
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Zero-point entropy in ‘spin ice’
TL;DR: In this paper, specific heat data for one such system, Dy2Ti2O7, from which they infer a total spin entropy of 0.67Rln2, similar to the value, determined for ice I-h, SO confirming the validity of the correspondence.