Abstract
Metal-organic frameworks based on metal-formates have emerged as a intriguing class of multiferroics with wide range of applications. In this work, we present magneto-Raman spectroscopic investigations on [(CH3)2NH2]Co(HCOO)3 belonging to this family. The spectroscopic studies were performed at magnetic fields up to 31 T at the temperature of 2.3 K. It was observed that the formate bending mode at around 798 cm−1 shifts to higher energies with increasing magnetic field. The magneto-response of the phonon also exhibits anomalies at magnetic fields of 14.5 T and 23.5 T corresponding to magnetic phase transitions. Based on our results, we conclude that the formate bending mode does play a role in facilitating the saturation of magnetic states similar to its Mn and Ni analogs.
Highlights
INTRODUCTIONMetal-organic framework (MOF) is an interesting class of hybrid materials that have excellent applications in catalysis, gas storage and sensors, drug delivery and many more. With the explosion of the field of multiferroics, MOFs became one of the sought after approaches to obtain materials that have at least two coexisting magnetic, electric and/or elastic orders. This quest for multiferroics in MOFs achieved its first success with the discovery of multiferroicity in the family of perovskite MOFs. Since several intriguing magnetic and ferroelectric properties were reported in this subgroup of metal formate MOFs
Several intriguing magnetic and ferroelectric properties were reported in this subgroup of metal formate Metal-organic framework (MOF)
We find that the formate bending mode at frequency of about 798 cm−1 is the only phonon sensitive to the external magnetic field
Summary
Metal-organic framework (MOF) is an interesting class of hybrid materials that have excellent applications in catalysis, gas storage and sensors, drug delivery and many more. With the explosion of the field of multiferroics, MOFs became one of the sought after approaches to obtain materials that have at least two coexisting magnetic, electric and/or elastic orders. This quest for multiferroics in MOFs achieved its first success with the discovery of multiferroicity in the family of perovskite MOFs. Since several intriguing magnetic and ferroelectric properties were reported in this subgroup of metal formate MOFs.. With the explosion of the field of multiferroics, MOFs became one of the sought after approaches to obtain materials that have at least two coexisting magnetic, electric and/or elastic orders.. With the explosion of the field of multiferroics, MOFs became one of the sought after approaches to obtain materials that have at least two coexisting magnetic, electric and/or elastic orders.6–8 This quest for multiferroics in MOFs achieved its first success with the discovery of multiferroicity in the family of perovskite MOFs.. More recently a coupling between the magnetic and ferroelectric order was observed in Mn-,16 Fe-18 and Co-23 based compounds These results indicate that they rather exhibit Type-. Co-MOF adopts a different mechanism to facilitate the transition to their fully saturated magnetic states unlike Mn- and Ni-based compounds which rely on formate bending mode for magneto-elastic coupling.. Co-MOF adopts a different mechanism to facilitate the transition to their fully saturated magnetic states unlike Mn- and Ni-based compounds which rely on formate bending mode for magneto-elastic coupling. In this article, we report the Raman spectroscopic investigations on [(CH3)2NH2]M(HCOO) with M=Co2+ (Co-MOF) at high magnetic fields that were performed to further probe the nature of magneto-elastic coupling in this intriguing family of MOFs
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