Effect of defects in the rare-earth sublattice of the Kondo insulator YbB12 on its spectral characteristics and magnetic susceptibility

For all the Rare-Earth (R) the R2In form in the same crystal structure (P63/mmc). These compounds show a great variety of magnetic behaviors. When the temperature decreases, the magnetic susceptibility of Er2InTb2In and Gd2In increases, passes through a maximum then decreases. For Gd2In this behavior was associated with change from a paramagnetic to a ferromagnetic then to an antiferromagnetic state. We have performed magnetic, transport (Tb, Er), Mössbauer spectroscopy (Er) and powder neutron diffraction experiments (Gd, Tb, Er) on these compounds. Unlike Gd2In the resistivity of Tb2In and Er2In does not reveal any anomaly at the temperature where the susceptibility begins to decrease and the Tb2In and Er2In magnetizations show the same behavior at all temperatures in the ordered region. Neutron diffraction experiments reveal ferromagnetic and antiferromagnetic structures at low temperature.

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Magnetic Field Effects in Antiferromagnetic CePd3In2

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.170.219 ◽

2011 ◽

Vol 170 ◽

pp. 219-222 ◽

Cited By ~ 1

Author(s):

André M. Strydom ◽

Douglas Britz

Keyword(s):

Magnetic Field ◽

Magnetic Susceptibility ◽

Rare Earth ◽

Specific Heat ◽

Magnetic Order ◽

Magnetic Field Effects ◽

Rare Earth Compound ◽

Field Effects ◽

The Stability ◽

The Rare Earth

We present results of specific heat and magnetic susceptibility measurements as function of temperature and magnetic field on the rare-earth compound CePd3In2. Known to order antiferromagnetic below 2.1 K, we discuss the influence of magnetic field on the stability of the magnetic order.

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Topological Phase and Strong Correlation in Rare-Earth Hexaborides XB6 (X = La, Ce, Pr, Nd, Pm, Sm, Eu)

Materials ◽

10.3390/ma13194381 ◽

2020 ◽

Vol 13 (19) ◽

pp. 4381

Author(s):

Sheng-Hsiung Hung ◽

Horng-Tay Jeng

Keyword(s):

Rare Earth ◽

Density Functional ◽

Topological Phase ◽

Strong Correlations ◽

Coulomb Interactions ◽

Kondo Insulator ◽

Wide Range ◽

Structural And Electronic Properties ◽

Hubbard U ◽

The Rare Earth

The rare-earth hexaboride SmB6, known as the topological Kondo insulator, has attracted tremendous attention in recent years. It was revealed that the topological phase of SmB6 is insensitive to the value of on-site Coulomb interactions (Hubbard U), indicating that the topological phase in SmB6 is robust against strong correlations. On the contrary, the isostructural YbB6 displays a sensitivity to the Hubbard U value. As U increases, YbB6 transforms from topological Kondo insulator to trivial insulator, showing the weak robustness of the topological phase of YbB6 against U. Consequently, the dependence of the topological phase on Hubbard U is a crucial issue in the rare-earth hexaboride family. In this work, we investigate the structural and electronic properties of rare-earth hexaboride compounds through first-principles calculations based on density functional theory. By taking the strong correlations into consideration using a wide range of on-site U values, we study the evolution of the topological phases in rare-earth hexaboride (XB6, X = La, Ce, Pr, Nd, Pm, Sm, Eu). Unlike YbB6, the topological trends in all the examples of XB6 studied in this work are insensitive to the U values. We conclude that in addition to the well-known SmB6, PmB6, NdB6 and EuB6 are also topologically nontrivial compounds, whereas LaB6, CeB6 and PrB6 are topologically trivial metal.

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