RT Journal Article
T1 Nonmonotonic evolution of the charge gap in ZnV2O4  under pressure
A1 Kuntscher, Christine
A1 Rabia, Kaneez
A1 Forthaus, M.K.
A1 Abd-Elmeguid, M. M.
A1 Rivadulla Fernández, José Francisco
A1 Kato, Y.
A1 Batista, Cristian D.
AB A2+V2O4 spinels provide a unique opportunity for studying the evolution of the charge gap of Mott insulatorsthat approach the itinerant electron limit under the application of external pressure. Here we report high-pressureresistivity and optical measurements in ZnV2O4 that provide unambiguous evidence of an unusual nonmonotonicbehavior of the charge gap, , as a function of pressure P. These unexpected results suggest that ZnV2O4undergoes a crossover from a Mott insulator with a charge gap dominated by the on-site Coulomb repulsion U, toa second type of insulator in the high pressure regime. Our Monte Carlo simulations of the three-band Hubbardmodel relevant for ZnV2O4 reproduce the nonmonotonic behavior of (P) and provide a partial understandingof this exotic phenomenon
PB APS Physics
SN 2469-9950
YR 2012
FD 2012
LK http://hdl.handle.net/10347/17033
UL http://hdl.handle.net/10347/17033
LA eng
NO Christine Kuntscher, Kaneez Rabia, M. K. Forthaus, M. M. Abd-Elmeguid, F. Rivadulla, Y. Kato, and C. D. Batista Phys. Rev. B 86, 020405(R) (2012). DOI: 10.1103/PhysRevB.86.020405
NO We acknowledge financial support from the DFG (SFB 484 and SFB 608) and the Bayerische Forschungsstiftung. F.R. acknowledges support from Ministerio de Economa y Competitividad, Spain, through the project MAT2010-16157. Work at LANL was performed under the auspices of the US DOE Contract No. DE-AC52-06NA25396 through the LDRD program
DS Minerva
RD 29 abr 2026