Unusual transport properties in the orbitally-ordered system Lu$_{2}$V$_{2}$O$_{7}$

ORAL

Abstract

DC susceptibility ($\chi )$, AC and DC resistivity ($\rho )$, specific heat ($C_{p})$, and thermoconductivity ($k)$ measurements on single crystalline Lu$_{2}$V$_{2}$O$_{7}$ with the pyrochlore structure reveal two transitions: (1) a short-range magnetic ordering transition at $T_{s}$ = 175 K, which is identified by the slope change of 1/ $\chi $ and 1/$k$, an anomaly in the AC resistivity, and a change in the activation energy (2) an orbital ordering transition at $T_{o}$ = 70 K, which is confirmed by the sharp transition on $\chi $, $k$, and $C_{p}$. At $T_{o}$, the resistivity shows an unusual insulator-metal transition which will be discussed in relation to the orbital ordering transition.

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Authors

  • Haidong Zhou

    • National High Magnetic Field Laboratory, Florida State University, Tallahassee-FL 32306, USA
    • Department of Physics and National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32306-3016, USA
    • FSU/NHMFL
    • Department of Physics and National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32306, USA

  • B. Conner

    • Department of Physics and National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32306-3016, USA

  • B.W. Vogt

    • Department of Physics and National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32306-3016, USA

  • C.R. Wiebe

    • Department of Physics and National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32306-3016, USA

  • L.L. Lumata

    • Department of Physics and National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32306-3016, USA

  • J.S. Brooks

    • Department of Physics and National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32306-3016, USA

  • E.S. Choi

    • National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32306, USA

  • Y. Xin

    • National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32306, USA