Magnetic Properties of Spinel Cobaltite A Co2O4 (A=Zn and Li)

2016 ◽  
Vol 257 ◽  
pp. 115-118
Author(s):  
Ryota Murai ◽  
Minoru Maeda ◽  
Kouichi Takase ◽  
Yoshiki Takano ◽  
Tadataka Watanabe
Keyword(s):  
Phase Transition ◽  
Magnetic Properties ◽  
Magnetic Phase Transition ◽  
Mixed Crystal ◽  
Magnetic Phase ◽  
The Other ◽  
Antiferromagnetic Transition ◽  
Weiss Temperature ◽  
Charge Degree ◽  
Charge Degree Of Freedom

We synthesized polycrystals of cobaltite spinels LiCo2O4, ZnCo2O4, and their mixed crystal (Li1-xZnx)Co2O4, and performed the magnetic susceptibility and specific heat measurements. LiCo2O4 with the Weiss temperature ΘW ~ -114 K exhibits an antiferromagnetic transition at TN ~ 30 K. On the other hand, ZnCo2O4 with the Weiss temperature ΘW ~ -90 K exhibits the absence of magnetic phase transition down to low temperature (2 K), indicating the presence of strong frustration. Taking into account the absence of magnetic phase transition in the orbital-degenerate ZnCo2O4, it is suggested that the antiferromagnetic transition in the charge-orbital-degenerate LiCo2O4 is driven by the charge degree of freedom. Furthermore, the magnetic properties of (Li1-xZnx)Co2O4 suggest that the antiferromagnetic transition in LiCo2O4 is sensitively suppressed by diluting the charge degeneracy.

Correlating the local magnetic properties of the magnetic phase transition inGd5Ge4using scanning Hall probe imaging

2006 ◽  
Vol 73 (14) ◽  
Author(s):  
J. D. Moore ◽  
G. K. Perkins ◽  
Y. Bugoslavsky ◽  
L. F. Cohen ◽  
M. K. Chattopadhyay ◽  
...  
Keyword(s):  
Phase Transition ◽  
Magnetic Properties ◽  
Magnetic Phase Transition ◽  
Magnetic Phase ◽  
Hall Probe

Magnetic phase transition and magnetic properties in rare-earth-based RAl3C3 layered carbides

2021 ◽  
Vol 540 ◽  
pp. 168445
Author(s):  
Shuli Sun ◽  
Rui Liu ◽  
Guiquan Yao ◽  
Zhaohui Chen ◽  
Qiang Wang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Magnetic Properties ◽  
Rare Earth ◽  
Magnetic Phase Transition ◽  
Magnetic Phase

Magnetic Phase Transition in the Csci Fesi Spacer in Fe/FeSi Multilayers

1995 ◽  
Vol 382 ◽  
Author(s):  
J. Dekoster ◽  
A. Vantomme ◽  
S. Degroote ◽  
R. Moons ◽  
G. Langouche
Keyword(s):  
Phase Transition ◽  
Magnetic Properties ◽  
Magnetic Phase Transition ◽  
Low Temperatures ◽  
Magnetic Phase ◽  
Ferromagnetic Coupling ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ion Channeling ◽  
Spacer Layer

ABSTRACTWe report the formation of the CsCI FeSi phase in Fe/FeSi multilayers with constant Fe thickness and varying FeSi layer thickness. The crystallographic and magnetic properties of this metastable FeSi phase are determined in thick (62 nm) epitaxial silicide layers with ion channeling, X-ray diffraction and Mossbauer spectroscopy measurements which clearly show that the CsCl phase becomes increasingly magnetic upon cooling down to 4.2 K. These results indicate that the transition from antiferromagnetic to ferromagnetic coupling observed at low temperatures in such multilayers is controlled by a magnetic phase transition in the FeSi spacer layer.

Structural and Magnetic Properties of RBa2Cu2NbO8 (R = La, Pr, Nd)

1992 ◽  
Vol 275 ◽  
Author(s):  
H. B. Radousky ◽  
J. C. O'Brien ◽  
M. Bennahmias ◽  
P. Klavins ◽  
C. A. Smith ◽  
...  
Keyword(s):  
Thin Film ◽  
Phase Transition ◽  
Magnetic Properties ◽  
Buffer Layer ◽  
Magnetic Phase Transition ◽  
Single Phase ◽  
Tunnel Junctions ◽  
Magnetic Phase ◽  
Magnetic Ordering ◽  
Structural And Magnetic Properties

ABSTRACTPrBa2Cu2NbO8 (PrBCNO) is an insulating analog to the YB2CU3O7 (YBCO) system, which is interesting as a thin film buffer layer in YBCO/PrBCNO/YBCO tunnel junctions as well as a potential high Tc superconductor if proper doping could be achieved. PrBCNO has a similar structure to PrBCO, with NbO2 planes replacing the CuO chains. Single phase polycrystalline samples of RBCNO have been synthesized with R = La, Pr and Nd. Attempts to synthesize this structure with the smaller ions Y and Gd have been unsuccessful. The PrBCNO samples show a signature in the magnetization of a magnetic ordering at 12 K. No such magnetic phase transition is observed down to 2 K in the NdBCNO material.

A RING OF JOSEPHSON-JUNCTIONS IN A MAGNETIC FIELD

1991 ◽  
Vol 05 (10) ◽  
pp. 1809-1816 ◽  
Author(s):  
F. V. Kusmartsev
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Magnetic Properties ◽  
Magnetic Phase Transition ◽  
Josephson Junctions ◽  
Magnetic Phase ◽  
Kinetic Inductance ◽  
Two Dimensional ◽  
The One

We studied the magnetic properties of the ring of a Josephson junctions in a magnetic field at different capacitance of superconducting regions. We found that the capacitance which is the characteristic of the size of the superconducting region, does not change qualitatively the magnetic properties of the ring of junctions. At half-quantum of the flux through the ring there appears the magnetic phase transition which is characterised by the singularity in magnetization and in sucseptibility. At the transition there is the trapping of the one quantum of the flux by the ring. The interpretation of experiments, describing the inverse kinetic inductance as a function of a flux per plaquette of a lattice of two-dimensional arrays of the Josephson junctions is proposed. The new singularities in this dependency are predicted.

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