Using electronic structure changes to map the H-T phase diagram of alpha'-NaV2O5

Abstract

We report polarized optical reflectance studies of α'-NaV2O5 as a function of temperature (4-45 K) and magnetic field (0-60 T). Rung directed electronic structure changes, as measured by near-infrared reflectance ratios ΔR(H)=R(H)/R(H=0 T), are especially sensitive to the phase boundaries. We employ these changes to map out an H-T phase diagram. Topological highlights include the observation of two phase boundaries slightly below T_{SG}, enhanced curvature of the 34 K phase boundary above 35 T, and, surprisingly, strong hysteresis effects of both transitions with applied field.

4 pages, 3 figures, PRB accepted

References in corpus (9)

• X-ray Anomalous Scattering Study of a Charge-Ordered State in NaV2O5
• Charge Order Driven spin-Peierls Transition in NaV2O5
• Optical spectroscopic study of the interplay of spin and charge in NaV2O5
• Low temperature ellipsometry of NaV2O5
• Electron-phonon and spin-phonon coupling in NaV${}_2$O${}_5$: charge fluctuations effect
• Optical properties and electronic structure of Ca-doped alpha'-NaV2O5
• High frequency ESR investigation on dynamical charge disproportionation and spin gap excitation in NaV_2O_5
• On the scaling of the (H-T)-phase diagram of CuGeO${}_3$
• Spin-Peierls transition in NaV2O5 in high magnetic fields