Tongfei Qi

Negative Thermal Expansion in a Novel Mott Insulator

Magnetic and Orbital Orders Coupled to Negative Thermal Expansion in Ca2Ru1-xMxO4 (M = 3D Transition Metal Ion)

• Broschiertes Buch

Produktbeschreibung

Ca2RuO4 is a structurally-driven Mott insulator with a metal-insulator (MI) transition at TMI = 357K, followed by a well-separated antiferromagnetic order at TN = 110 K. Slightly substituting Ru with a 3d transition metal ion M effectively shifts TMI and induces exotic magnetic behavior below TN. Moreover, M doping for Ru produces negative thermal expansion in Ca2Ru1-xMxO4 (M = Cr, Mn, Fe or Cu); the lattice volume expands on cooling with a total volume expansion ratio reaching as high as 1%. The onset of the negative thermal expansion closely tracks TMI and TN, sharply contrasting classic negative thermal expansion that shows no relevance to electronic properties. In addition, the observed negative thermal expansion occurs near room temperature and extends over a wide temperature interval. These findings underscores new physics driven by a complex interplay between orbital, spin and lattice degrees of freedom. These materials constitute a new class of Negative Thermal Expansion materials with novel electronic and magnetic functions.

Produktdetails

• Verlag: LAP Lambert Academic Publishing
• Seitenzahl: 144
• Erscheinungstermin: 28. Juli 2013
• Englisch
• Abmessung: 220mm x 150mm x 9mm
• Gewicht: 233g
• ISBN-13: 9783659334726
• ISBN-10: 3659334723
• Artikelnr.: 39176193

Autorenporträt

Dr. Tongfei Qi's research interest has focused on Novel materials single crystal synthesis (mostly on transition metal related compounds); crystal structure study; high-field, low-temperature, high-pressure material properties and other physical properties of these compounds.