Severe Fermi Surface Reconstruction at a Metamagnetic-Transition in Ca$_{2-x}$Sr$_x$RuO$_4$ (for $0.2 \leq x \leq 0.5$)

L. Balicas; S. Nakatsuji; D. Hall; H. Lee; Z. Fisk; Y. Maeno; D. J. Singh

doi:10.1103/PhysRevLett.95.196407

paper

Severe Fermi Surface Reconstruction at a Metamagnetic-Transition in Ca $_{2 - x}$ Sr $_{x}$ RuO $_{4}$ (for $0.2 \leq x \leq 0.5$ )

arXiv:cond-mat/0507457 · doi:10.1103/PhysRevLett.95.196407

Abstract

We report an electrical transport study in Ca $_{2 - x}$ Sr $_{x}$ RuO $_{4}$ single crystals at high magnetic fields ( $B$ ). For $x = 0.2$ , the Hall constant $R_{x y}$ decreases sharply at an anisotropic metamagnetic (MM) transition reaching its value for Sr $_{2}$ RuO $_{4}$ at high fields. A sharp decrease in the $A$ coefficient of the resistivity $T^{2}$ -term and a change in the structure of the angular magnetoresistance oscillations (AMRO) for $B$ rotating in the planes, confirms the reconstruction of the Fermi surface (FS). Our observations and LDA calculations indicate a strong dependence of the FS on the Ca concentration and suggest the coexistence of itinerant and localized electronic states in single layered ruthenates.

5 pages, 4 figs

Severe Fermi Surface Reconstruction at a Metamagnetic-Transition in Ca2−x​Srx​RuO4​ (for 0.2≤x≤0.5)

Abstract

Severe Fermi Surface Reconstruction at a Metamagnetic-Transition in Ca $_{2 - x}$ Sr $_{x}$ RuO $_{4}$ (for $0.2 \leq x \leq 0.5$ )