The magnetic properties of single crystals of erbium and some yttrium-erbium and lutetium-erbium alloys between 1.2 and 300°K

We report on the synthesis and physical properties of cm-sized CoGeO3 single crystals grown in a high pressure mirror furnace at pressures of 80 bar. Direction dependent magnetic susceptibility measurements on our single crystals reveal highly anisotropic magnetic properties that we attribute to the impact of strong single ion anisotropy appearing in this system with TN∼33.5 K. Furthermore, we observe effective magnetic moments that are exceeding the spin only values of the Co ions, which reveals the presence of sizable orbital moments in CoGeO3.

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Tunable magnetization steps in mixed valent ferromagnet Eu2CoMnO6

Scientific Reports ◽

10.1038/s41598-021-88950-w ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Nara Lee ◽

Jong Hyuk Kim ◽

Dong Gun Oh ◽

Hyun Jun Shin ◽

Hwan Young Choi ◽

...

Keyword(s):

Material Processing ◽

Magnetic Properties ◽

Single Crystals ◽

Magnetic State ◽

Hysteresis Loops ◽

Double Perovskite ◽

Processing Parameters ◽

Perovskite Oxides ◽

Efficient Approach ◽

Isothermal Magnetization

AbstractMagnetic properties can be manipulated to enhance certain functionalities by tuning different material processing parameters. Here, we present the controllable magnetization steps of hysteresis loops in double-perovskite single crystals of Eu2CoMnO6. Ferromagnetic order emerges below TC ≈ 122 K along the crystallographic c axis. The difficulty in altering Co2+ and Mn4+ ions naturally induces additional antiferromagnetic clusters in this system. Annealing the crystals in different gas environments modifies the mixed magnetic state, and results in the retardation (after O2-annealing) and bifurcation (after Ar-annealing) of the magnetization steps of isothermal magnetization. This remarkable variation offers an efficient approach for improving the magnetic properties of double-perovskite oxides.

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Suppression of Ferromagnetism in EuxCa1-xB6

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.190.97 ◽

2012 ◽

Vol 190 ◽

pp. 97-100 ◽

Cited By ~ 1

Author(s):

V.V. Glushkov ◽

A.V. Kuznetsov ◽

I. Sannikov ◽

A.V. Bogach ◽

S.V. Demishev ◽

...

Keyword(s):

Magnetic Properties ◽

Magnetic Susceptibility ◽

Curie Temperature ◽

Single Crystals ◽

Effective Magnetic Moment ◽

Paramagnetic State ◽

Low Field ◽

Wide Range ◽

Free Ion ◽

The Eu

We report the magnetic properties of EuxCa1-xB6 single crystals (0.756x1) studied in the wide range of temperatures (1.8-300 K) and magnetic fields (up to 50 kOe). It was found that low field magnetic susceptibility χ (T) follows the Curie-Weiss law χ~(T-Θp)-1 at high temperatures for all the concentrations studied. The effective magnetic moment of the Eu2+ ion estimated from the data diminishes from the free ion value μeff7.93μB (μB - Bohr magneton) for x=1 to μeff7.3μB for x=0.756. A universal behavior of magnetic susceptibility χ~(T-Θ)-α (α=1.5) is detected close to the Curie temperature TC in the paramagnetic state at both metallic (x>xC~0.8) and dielectric (xC.

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