2003/04/17 by G. Cao, Gang Cao, Luis Balicas +4 · 2 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.67.184405
27 pages, 9 figures
arxiv created 2003/04/17 · openalex publication_date 2003/05/06 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report magnetic and interplane transport properties of Ca3Ru2O7 at high magnetic fields and low temperatures. Ca3Ru2O7 with a bilayered orthorhombic structure is a Mott-like system with a narrow charge gap of 0.1 eV. Of a host of unusual physical phenomena revealed in this study, a few are particularly intriguing: (1) a collapse of the c-axis lattice parameter at a metal-nonmetal transition, TMI(=48K), and a rapid increase of TMI with low uniaxial pressure applied along the c axis; (2) quantum oscillations in the gapped, nonmetallic state for 20mK<T<6.5K; (3) tunneling colossal magnetoresistance, which yields a precipitate drop in resistivity by as much as 3 orders of magnitude; (4) different in-plane anisotropies of the colossal magnetoresistance and magnetization. All results appear to indicate a highly anisotropic ground state and a critical role of coupling between lattice and magnetism. The implication of these phenomena is discussed.