Mössbauer Spectroscopy under Magnetic Field to Explore the Low Temperature Spin Structure in a Molecular Layered Ferrimagnet A. Bhattacharjee, P. Gütlich.

Slides:

Advertisements

Similar presentations

169 Tm Mössbauer Spectroscopy J.M. Cadogan Department of Physics and Astronomy University of Manitoba Winnipeg, Manitoba, R3T 2N2 Canada

Advertisements

Metal-to-Metal Electron Transfer and Magnetic Interactions in a Mixed-Valence Prussian Blue Analogue A. Bhattacharjee, P. Gütlich et al. Department of.

Thermal and light-induced spin transition in iron compounds P. Gütlich et al. Institut für Anorganische Chemie und Analytische Chemie Johannes Gutenberg-Universität.

157 T INTERNAL MAGNETIC FIELD IN Fe[C(SiMe 3 ) 3 ] 2 COMPOUND AT 20K Ernő Kuzmann, 1,2 Roland Szalay, 2 Attila Vértes, 1,2 Zoltán Homonnay, 2 Imre Pápai,

Spin reorientation in the Er 2-x Fe 14+2x Si 3 single-crystal studied by Mössbauer spectroscopy J. Żukrowski 1, A. Błachowski 2, K. Ruebenbauer 2, J. Przewoźnik.

Magnetism of the ‘11’ iron-based superconductors parent compound Fe1+xTe: The Mössbauer study A. Błachowski1, K. Ruebenbauer1, P. Zajdel2, E.E. Rodriguez3,

A. Błachowski1, K. Ruebenbauer1, J. Żukrowski2, and Z. Bukowski3

2Instituto de Ciencia de Materiales de Madrid,

Zero-Phonon Line: transition without creation or destruction of phonons Phonon Wing: at T = 0 K, creation of one or more phonons 7. Optical Spectroscopy.

Order-Disorder Transformations. THE ENTITY IN QUESTION GEOMETRICALPHYSICAL E.g. Atoms, Cluster of Atoms Ions, etc. E.g. Electronic Spin, Nuclear spin.

c18cof01 Magnetic Properties Iron single crystal photomicrographs

DIFFERENT TYPES OF MAGNETIC MATERIAS (a) Diamagnetic materials and their properties  The diamagnetism is the phenomenon by which the induced magnetic.

1 Spin Freezing in Geometrically Frustrated Antiferromagnets with Weak Bond Disorder Tim Saunders Supervisor: John Chalker.

Magnetism in Chemistry. General concepts There are three principal origins for the magnetic moment of a free atom: The spins of the electrons. Unpaired.

Semiconductors n D*n If T>0

Content Origins of Magnetism Kinds of Magnetism Susceptibility and magnetization of substances.

Monte Carlo Simulation of Ising Model and Phase Transition Studies

Phase Transformations: – many different kinds of phase transitions: dimension, microscopic origin… – cooperativity (dominos’ effect) play a key role Example:

Magnetism III: Magnetic Ordering

Introduction to Single Molecular Magnet

ELECTRIC AND MAGNETIC FIELD INTERACTIONS WITH MATERIALS By: Engr. Hinesh Kumar (Lecturer)

Magnetic transition in the Kondo lattice system CeRhSn2

Magnetic properties of a frustrated nickel cluster with a butterfly structure Introduction Crystal structure Magnetic susceptibility High field magnetization.

Mössbauer study of iron-based superconductors A. Błachowski 1, K. Ruebenbauer 1, J. Żukrowski 2 1 Mössbauer Spectroscopy Division, Institute of Physics,

Monte Carlo Simulation of Ising Model and Phase Transition Studies By Gelman Evgenii.

A image of the flux line lattice in the magnetic superconductor TmNi2B2C The hexagonal arrangement of magnetic flux lines in pure Nb imaged using neutrons.

Superconducting FeSe studied by Mössbauer spectroscopy and magnetic measurements A. Błachowski 1, K. Ruebenbauer 1, J. Żukrowski 2, J. Przewoźnik 2, K.

Magnetic Properties Scott Allen Physics Department University of Guelph of nanostructures.

Yb valence in YbMn 2 (Si,Ge) 2 J.M. Cadogan and D.H. Ryan Department of Physics and Astronomy, University of Manitoba Winnipeg, MB, R3T 2N2, Canada

Crystal structure, T-P phase diagram and magnetotransport properties of new organic metal Crystal structure, T-P phase diagram and magnetotransport properties.

Colossal Magnetoresistance of Me x Mn 1-x S (Me = Fe, Cr) Sulfides G. A. Petrakovskii et al., JETP Lett. 72, 70 (2000) Y. Morimoto et al., Nature 380,

Mössbauer spectroscopic studies by T.SHINJO. Degree of interlayer mixing is different at the two interfaces (head and tail). A result for Fe layer in.

1 Magnetism GLY 4200 Fall, Early Observations of Magnetism Ancient Greeks, especially those near the city of Magnesia, and Chinese, observed natural.

Calorimetric Investigation under High Pressure Shimizu-Group M1 Shigeki TANAKA F. Bouquet et al., Solid State Communications 113 (2000)

Coexistence and Competition of Superconductivity and Magnetism in Ho 1-x Dy x Ni 2 B 2 C Hyeon-Jin Doh, Jae-Hyuk Choi, Heon-Jung Kim, Eun Mi Choi, H. B.

Spin dynamics in Ho 2-x Y x Sn 2 O 7 : from the spin ice to the single ion magnet G. Prando 1, P. Carretta 1, S.R. Giblin 2, J. Lago 1, S. Pin 3, P. Ghigna.

Mössbauer spectroscopy of iron-based superconductors A. Błachowski 1, K. Ruebenbauer 1, J. Żukrowski 2, J. Przewoźnik 2 11-family cooperation K. Wojciechowski.

The first-order magnetostructural transition in Gd 5 Sn 4 D.H. Ryan Physics Department, McGill University, Montreal, QC, Canada, H3A 2T8

Summary of Collaborative Investigation – Na 5 ACu 4 (AsO 4 ) 4 Cl 2 (A = Rb, Cs) Jeffrey Clayhold, Miami University, USA Shiou-Jyh Hwu, Clemson University,

Introduction to Molecular Magnets Jason T. Haraldsen Advanced Solid State II 4/17/2007.

13. Extended Ensemble Methods. Slow Dynamics at First- Order Phase Transition At first-order phase transition, the longest time scale is controlled by.

c18cof01 Magnetic Properties Iron single crystal photomicrographs

Magnetic properties and NMR data of Rb2MnCl4, RbMnCl3 Kang, Byeongki

Synthesis and Properties of Magnetic Ceramic Nanoparticles Monica Sorescu, Duquesne University, DMR Outcome Researchers in Duquesne University.

Superconducting FeSe studied by Mössbauer spectroscopy and magnetic measurements A. Błachowski 1, K. Ruebenbauer 1, J. Żukrowski 2, J. Przewoźnik 2, K.

W. M. Reiff a, M. Feist b, and E. Kemnitz b a Department of Chemistry, Northeastern University, Boston MA, 02115, USA; b Institut.

Ferric Fluorides: crystalline, amorphous and nanostructured states J. M. Greneche Laboratoire de Physique de l`Etat Condensé, UMR CNRS 6087, Université.

J.P. Eisenstein, Caltech, DMR If it were not for the Coulomb repulsion between electrons, iron would not be ferromagnetic. It would instead be.

From J.R. Waldram “The Theory of Thermodynamics”.

Sources of Magnetic Fields

M. Ueda, T. Yamasaki, and S. Maegawa Kyoto University Magnetic resonance of Fe8 at low temperatures in the transverse field.

Synthesis and Properties of Magnetic Ceramic Nanoparticles Monica Sorescu, Duquesne University, DMR Outcome Researchers at Duquesne University.

Point contact properties of intermetallic compound YbCu (5-x) Al x (x = 1.3 – 1.75) G. PRISTÁŠ, M. REIFFERS Institute of Exp. Physics, Center of Low Temperature.

Magnetism of the regular and excess iron in Fe1+xTe

Signatures of Berezinskii-Kosterlitz-Thouless transition in double-layered molecular magnet based on [W V (CN) 8 ] 3- and Cu 2+ Signatures of Berezinskii-Kosterlitz-Thouless.

Eutectic Phase Diagram NOTE: at a given overall composition (say: X), both the relative amounts.

Cytomechanics of Osteoblasts and Osteoblast-like cells Dept. of Experimental Orthopaedics and Biomechanics Prof. Dr.David B.Jones.

MÖSSBAUER SPECTROSCOPY OF IRON-BASED SUPERCONDUCTOR FeSe

Single crystal growth of Heisenberg spin ladder and spin chain Single crystal growth of Heisenberg spin ladder and spin chain Bingying Pan, Weinan Dong,

Low Temperature Phase Transitions in GdPdAl

High pressure synthesis of lone-pair

Chapter 10 Magnetic Properties Introduction 10

Applications of the Canonical Ensemble:

Magnetism and Magnetic Materials

NICPB, Tallinn, Estonia: R. Stern I. Heinmaa A. Kriisa E. Joon

Experiment Method:

Ferromagnetism.

Magnetic Properties of Coordination Compounds

Fig. 4 Superconductivity gap and specific heat jump.

Presentation transcript:

Mössbauer Spectroscopy under Magnetic Field to Explore the Low Temperature Spin Structure in a Molecular Layered Ferrimagnet A. Bhattacharjee, P. Gütlich et al. Department of Physics, Visva-Bharati University, Santiniketan , India, Department of Chemistry, University of Mainz, 55099, Mainz, Germany,

{N(n-C 4 H 9 ) 4 [Fe II Fe III (C 2 O 4 ) 3 ]} A Molecular Ferrimagnet The oxalato-bridged layered ferrimagnet {N(n-C 4 H 9 ) 4 [Fe II Fe III (C 2 O 4 ) 3 ]} exhibits the rarely occurring negative magnetization phenomenon below 30 K. Heat capacity calorimetry of this compound under zero magnetic field detected the ferrimagnetic transition at 43.3 K and a small heat capacity anomaly around 16.3 K. Results from the magnetic field dependent heat capacity study of this material indicated the existence of different spin structures at low temperatures. An ac magnetic susceptibility measurement of this compound demonstrated the existence of a spin glass-like state below 30 K. Mössbauer spectroscopy is a powerful tool for studying magnetic systems with complicated magnetic structure, as this method offers the possibility to observe local spin configurations of different types as well as provides the quantitative estimation of different spin sites in a solid lattice. We have attempted to understand the origin of the spin glass state in the present compound at low temperatures with the help of 57 Fe Mössbauer spectroscopy under high magnetic field. For further details on this research problem see: Bhattacharjee, et al., J. Phys. Soc. Jpn. 68 (1999) Bhattacharjee, et al., J. Phys. Soc. Jpn. 69 (2000) 479. Bhattacharjee, et al., Solid State Commun. 113 (2000) 543. Bhattacharjee, et al., J. Phys. Soc. Jpn. 71 (2002) Bhattacharjee, et al., J. Phys.: Condens. Matter 15 (2003) 5103.

Mössbauer Spectroscopy of {N(n-C 4 H 9 ) 4 [Fe II Fe III (C 2 O 4 ) 3 ]} Bhattacharjee, et al., J. Phys.: Condens. Matter 15 (2003) 5103.

Observation Mössbauer spectroscopy of the molecular ferrimagnet - {N(n-C 4 H 9 ) 4 [Fe II Fe III (C 2 O 4 ) 3 ]} under high external magnetic field at 4.2 K successfully detected different types of Fe II and Fe III high spin sites in the lattices. The hyperfine field values estimated for all the Fe III high spin sites are close to the expected values, whereas those for Fe II high spin sites are substantially different than usually expected. A large fraction of magnetically disordered Fe III high spin sites were found. It is understood that the layered structure of the compound may have two kinds of sub-lattices as (Fe II A -ox-Fe III A -...) and (Fe II B -ox-Fe III B -...) along with randomly placed magnetically disordered Fe III C sites, where the Fe III A and Fe III B are antiferromagnetically aligned. Existence of the magnetically and/or structurally non-equivalent spin sites in the same lattice has been held responsible for the coexistence of different ferrimagnetic interactions leading to the spin glass state, as observed through earlier magnetic and calorimetric measurements. Schematic ferrimagnetic arrangement of spins at different sites along c-axis in the lattice. (solid arrow: Fe III spin, S = 5/2; dashed arrow: Fe II spin, S = 2).