S.D. Mahanti – författare

This text contains articles, both experimental and theoretical, by leading researchers on various aspects of doped manganites. They cover structural, optical, magnetic and transport properties. Doped manganites are not only important for potential applications because of their "colossal" magnetoresistance, but are fascinating systems to study because of strong coupling between charge, spin and orbital degrees of freedom associated with Mn ions.

This series of books, which is published at the rate of about one per year, addresses fundamental problems in materials science. The contents cover a broad range of topics from small clusters of atoms to engineering materials and involves chemistry, physics, materials science and engineering, with length scales ranging from Ångstroms up to millimeters. The emphasis is on basic science rather than on applications. Each book focuses on a single area of current interest and brings together leading experts to give an up to date discussion of their work and the work of others. Each article contains enough references that the interested reader can access the relevant literature. Thanks are given to the Center for Fundamental Materials Research at Michigan State University for supporting this series. M. F. Thorpe, Series Editor E mail: thorpe@pa. msu. edu V PREFACE This book records invited lectures given at the workshop on Physics of Manganites, held at Michigan State University, July 26 29, 1998. Doped manganites are an interesting class of compounds that show both metal insulator and ferromagnetic to paramagnetic transitions at the same temperature. This was discovered in the early 1950s by Jonker and van Santen and basic theoretical ideas were developed by Zener (1951), Anderson and Hasegawa (1955), and deGennes (1960) to explain these transitions and related interesting observations.

This seriesofbooks, which is publishedattherateofaboutoneper year, addresses fundamental problems in materialsscience.Thecontents coverabroadrangeoftopicsfromsmallclustersofatomstoengineering materials and involve chemistry, physics, materials science, and engineering,withlengthscalesrangingfromAngstromsuptomillimeters. Theemphasis is on basic scienceratherthan on applications. Each book focuses on a single areaofcurrent interest and brings together leading experts to give an up-to-date discussion oftheir work and the workof others. Each articlecontainsenough references thattheinterestedreader can access the relevant literature. Thanks are given to the Center for Fundamental Materials Research at Michigan State University for supportingthisseries. M.F.Thorpe,SeriesEditor E-mail:thorpe@pa.msu.edu EastLansing,Michigan,November2002 v PREFACE ThisvolumerecordsinvitedlecturesgivenattheNewThermoelectric(TE)Materials Workshopheld inTraverseCity,MichiganfromAugust17-21,2002.Thethemeofthe workshop was Chemistry, PhysicsandMaterials ScienceofThermoelectric Materials: Beyond Bismuth Telluride. The objective of this symposium was threefold.First, to examine and assess the ability of solid state chemistry to produce new generation materials for TE applications. Second, to rationalize and predict the charge and heat transportpropertiesofpotentialcandidatesandhypotheticalsystemsthroughsolidstate theoryandexperiment.Third,toidentifyandprioritizeresearchneededtoreachvarious levelsofrequirementsintermsofZTandtemperature.Theseobjectiveswereaddressed by a series of invited talks and discussions by leading experts from academia, governmentlaboratories,andindustry. Thereweretwenty-twoinvitedandeightposterpresentations inthe workshop.Out ofthese,sixteeninvitedpresentationsarerepresentedinthisvolume.Theycoverawide range of subjects, starting from synthesis (based on different strategies) and characterizationofnovel materials to acareful studyoftheir transport properties and electronicstructure.Topicsaddressingtheissueofmakingnew materialsare: synthetic search for new materials (di Salvo et aI.) and synthetic strategies based on phase homologies (Kanatzidis). The different classes of materials covered are: bismuth nanowires (Dresselhausetal.), unconventional high-temperaturethermoelectrics, boron carbides (Aselage et aI.), layered cobalt oxides (Fujii et aI.), early transition metal antimonides(KleinkeetaI.),skutterudites(Uher),andclathratethermoelectrics(Nolas).

This book contains articles, both experimental and theoretical, by leading researchers on various aspects of doped manganites. They cover structural, optical, magnetic, and transport properties. Doped manganites are not only important for potential applications because of their 'colossal' magnetoresistance, but are extremely fascinating systems to study because of strong coupling between charge, spin, and orbital degrees of freedom associated with Mn ions.

This seriesofbooks, which is publishedattherateofaboutoneper year, addresses fundamental problems in materialsscience.Thecontents coverabroadrangeoftopicsfromsmallclustersofatomstoengineering materials and involve chemistry, physics, materials science, and engineering,withlengthscalesrangingfromAngstromsuptomillimeters. Theemphasis is on basic scienceratherthan on applications. Each book focuses on a single areaofcurrent interest and brings together leading experts to give an up-to-date discussion oftheir work and the workof others. Each articlecontainsenough references thattheinterestedreader can access the relevant literature. Thanks are given to the Center for Fundamental Materials Research at Michigan State University for supportingthisseries. M.F.Thorpe,SeriesEditor E-mail:thorpe@pa.msu.edu EastLansing,Michigan,November2002 v PREFACE ThisvolumerecordsinvitedlecturesgivenattheNewThermoelectric(TE)Materials Workshopheld inTraverseCity,MichiganfromAugust17-21,2002.Thethemeofthe workshop was Chemistry, PhysicsandMaterials ScienceofThermoelectric Materials: Beyond Bismuth Telluride. The objective of this symposium was threefold.First, to examine and assess the ability of solid state chemistry to produce new generation materials for TE applications. Second, to rationalize and predict the charge and heat transportpropertiesofpotentialcandidatesandhypotheticalsystemsthroughsolidstate theoryandexperiment.Third,toidentifyandprioritizeresearchneededtoreachvarious levelsofrequirementsintermsofZTandtemperature.Theseobjectiveswereaddressed by a series of invited talks and discussions by leading experts from academia, governmentlaboratories,andindustry. Thereweretwenty-twoinvitedandeightposterpresentations inthe workshop.Out ofthese,sixteeninvitedpresentationsarerepresentedinthisvolume.Theycoverawide range of subjects, starting from synthesis (based on different strategies) and characterizationofnovel materials to acareful studyoftheir transport properties and electronicstructure.Topicsaddressingtheissueofmakingnew materialsare: synthetic search for new materials (di Salvo et aI.) and synthetic strategies based on phase homologies (Kanatzidis). The different classes of materials covered are: bismuth nanowires (Dresselhausetal.), unconventional high-temperaturethermoelectrics, boron carbides (Aselage et aI.), layered cobalt oxides (Fujii et aI.), early transition metal antimonides(KleinkeetaI.),skutterudites(Uher),andclathratethermoelectrics(Nolas).