Magnetic-field induced melting of long-range magnetic order akin to Kitaev insulators in the metallic compound TbSi.

There have been constant efforts to find 'exotic' quantum spin-liquid (QSL) materials. Some of the transition metal insulators dominated by the direction-dependent anisotropic exchange interaction ('Kitaev model' for honeycomb network of magnetic ions) are considered to be promising cases for the same. In such Kitaev insulators, QSL is achieved from the zero-field antiferromagnetic state by the application of magnetic-field, suppressing other exchange interactions responsible for magnetic order.

Insight into the negative magnetization and anomalous exchange-bias in DyFe5Al7 through neutron depolarization and neutron diffraction studies.

We have provided the mesoscopic and microscopic understandings of polarity reversal of the magnetization or negative magnetization (NM) below TCOMP = 93 K in an exotic magnetic material containing three magnetic sublattices, viz., DyFe5Al7 crystallizing in ThMn12 structure, using neutron depolarization and neutron diffraction techniques. A full recovery of the neutron beam polarization at the TCOMP in a neutron depolarization experiment reveals a total compensation of magnetization inside the magnetic domains in the sample.

Electronic structure studies on single crystalline NdPdSi, an exotic Nd-based intermetallic: evidence for Nd 4hybridization.

In the series RPdSi, NdPdSiis an anomalous compound in the sense that it exhibits ferromagnetic order unlike other members in this family. The magnetic ordering temperature is also unusually high compared to the expected value for a Nd-based system, assuming 4localization. Here, we have studied the electronic structure of single crystalline NdPdSiemploying high resolution photoemission spectroscopy andband structure calculations.

Destruction of multiferroicity in TbBaNiO by Sr-doping and its implication to magnetodielectric coupling.

The Haldane spin-chain compound, TbBaNiO, with two antiferromagnetic transitions, one at T   =  63 K and the other at T   =  25 K, has been recently shown to be an exotic multiferroic below T . Here, we report the results of our investigation of Sr doping at the Ba site by magnetization, heat-capacity, magnetodielectric (MDE) and pyrocurrent measurements. An intriguing finding, which we stress, is that the ferroelectricity is lost even for a doping level of ten atomic percent, though magnetic ordering prevails.

Observation of magnetoelastic and magnetoelectric coupling in Sc doped BaFeO due to spin-glass-like phase.

The present work reports magnetic, magnetoelastic and magnetoelectric (ME) response of scandium (Sc) doped barium hexaferrite, BaFeScO. DC magnetization shows that partial substitution of non-magnetic Sc for Fe in barium hexaferrite results in a reduction of Curie temperature (T ) from 730 K known for the parent compound BaFeO to 430 K. Magnetization measurements show that, in BaFeScO, in addition to the magnetic transition at 250 K corresponding to longitudinal conical magnetic structure, another magnetic anomaly occurs in the vicinity of 50 K (T ).