Magnetotransport properties of alkali metal doped La–Ca–Mn–O system under pulsed magnetic field: Decrease of small polaron coupling constant and melting of polarons in the high temperature phase

2003 ◽  
Vol 119 (7) ◽  
pp. 3972-3982 ◽  
Author(s):  
Sayani Bhattacharya ◽  
S. Pal ◽  
Aritra Banerjee ◽  
H. D. Yang ◽  
B. K. Chaudhuri
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Alkali Metal ◽  
Small Polaron ◽  
High Temperature Phase ◽  
Pulsed Magnetic Field ◽  
Temperature Phase ◽  
Coupling Constant ◽  
Metal Doped

Synthesis and Crystal Structure of a “High-temperature” Phase of Li[H2NC(O)NH], the Missing Alkali-Metal Ureate

2014 ◽  
Vol 69 (6) ◽  
pp. 651-654
Author(s):  
Hannah Sawinski ◽  
Richard Dronskowski
Keyword(s):  
Crystal Structure ◽  
High Temperature ◽  
Alkali Metal ◽  
Single Crystals ◽  
Liquid Ammonia ◽  
High Temperature Phase ◽  
Monoclinic Space Group ◽  
Temperature Phase ◽  
Synthesis And Crystal Structure ◽  
Bond Lengths

The new salt-like lithium ureate, LiCN2H3O, 1, was synthesized to round up the series of the recently published alkali-metal ureates. Single crystals of 1 were prepared similarly to the previously made ureates of Na-Cs in liquid ammonia. LiCN2H3O crystallizes in the monoclinic space group P21/n with a = 7:5770(9), b = 9:059(1), c = 13:046(2) Å, b = 98:896(2)°, V = 884:8(2)Å3, and Z = 12. The Li+ ions are coordinated by four ureate anions in a distorted tetrahedral manner. As expected, the deprotonation of the urea molecules is reflected by the shape of the anions with two different C-N bond lengths.

scholarly journals SOME ASPECTS OF THE NON-PERTURBATIVE RENORMALIZATION OF THE φ4 MODEL

2009 ◽  
Vol 23 (32) ◽  
pp. 5935-5947 ◽  
Author(s):  
J. KAUPUŽS
Keyword(s):  
High Temperature ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Single Pair ◽  
Coupling Constant ◽  
Perturbative Method ◽  
Perturbative Renormalization ◽  
Expansion Coefficients

A non-perturbative renormalization of the φ4 model is considered. First, we integrate out only a single pair of conjugated modes with wave vectors ±q. Then, we are looking for the RG equation which would describe the transformation of the Hamiltonian under the integration over a shell Λ - d Λ < k < Λ, where dΛ → 0. We show that the known Wegner–Houghton equation is consistent with the assumption of a simple superposition of the integration results for ±q. The renormalized action can be expanded in powers of the φ4 coupling constant u in the high temperature phase at u → 0. We compare the expansion coefficients with those exactly calculated by the diagrammatic perturbative method and find some inconsistency. It causes a question in which sense the Wegner–Houghton equation is really exact.

scholarly journals Tunable gigahertz dynamics of low-temperature skyrmion lattice in a chiral magnet

2021 ◽  
Author(s):  
Oscar Lee ◽  
Jan Sahliger ◽  
Aisha Aqeel ◽  
Safe Khan ◽  
Shinichiro Seki ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Low Temperature ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Saturation Field ◽  
Crystalline Anisotropy ◽  
Resonance Frequencies ◽  
Field Cycling ◽  
Magnetic Insulator

Abstract Recently, it has been shown that the chiral magnetic insulator Cu2OSeO3 hosts skyrmions in two separated pockets in temperature and magnetic field phase space. It has also been shown that the predominant stabilization mechanism for the low-temperature skyrmions (LTS) phase is the crystalline anisotropy in contrast to temperature fluctuations, which stabilize the well established high-temperature skyrmion (HTS) lattice. Here, we report on the gigahertz dynamics in the LTS phase in Cu2OSeO3. The LTS phase is populated via a field cycling protocol with the static magnetic field applied parallel to the h100i crystalline direction of plate and cuboid-shaped bulk crystals. By analyzing temperature-dependent broadband spectroscopy data, clear evidence of low-temperature skyrmion excitations with clockwise (CW), counterclockwise (CCW), and breathing mode (BR) character at temperatures below T = 40 K are shown. We find that the modes’ intensities can be tuned with the number of field-cycles below the saturation field, and by tracking the resonance frequencies, the LTS phase diagram can be established. From our experiments, we conclude that the LTS phase is well separated from the high-temperature phase. Furthermore, by monitoring the strength of the observed hybridization between a dark CW mode and the BR as a function of temperature for the two differently shaped crystals, we unambiguously conclude that the magnetocrystalline anisotropy governs the hybridization.

Structural Study of TlH2PO4 and TlD2PO4 in the High Temperature Phase

1995 ◽  
Vol 5 (7) ◽  
pp. 763-769 ◽  
Author(s):  
S. Rios ◽  
W. Paulus ◽  
A. Cousson ◽  
M. Quilichini ◽  
G. Heger ◽  
...  
Keyword(s):  
High Temperature ◽  
Structural Study ◽  
High Temperature Phase ◽  
Temperature Phase

LATTICE DYNAMICS CALCULATIONS FOR SOLID BIPHENYL IN THE HIGH TEMPERATURE PHASE

1981 ◽  
Vol 42 (C6) ◽  
pp. C6-599-C6-601 ◽  
Author(s):  
T. Wasiutynski ◽  
I. Natkaniec ◽  
A. I. Belushkin
Keyword(s):  
High Temperature ◽  
Lattice Dynamics ◽  
High Temperature Phase ◽  
Temperature Phase

High temperature phase transitions and proton conductivity in some kdp-family crystals

1989 ◽  
Vol 100 (1) ◽  
pp. 135-141 ◽  
Author(s):  
A. I. Baranov ◽  
V. P. Khiznichenko ◽  
L. A. Shuvalov
Keyword(s):  
Phase Transitions ◽  
High Temperature ◽  
Proton Conductivity ◽  
High Temperature Phase ◽  
Temperature Phase

Review and characterisation of high-temperature phase change material candidates between 500 C and 700°C

2021 ◽  
Vol 150 ◽  
pp. 111528
Author(s):  
Ming Liu ◽  
Ehsan Shamil Omaraa ◽  
Jia Qi ◽  
Pegah Haseli ◽  
Jumal Ibrahim ◽  
...  
Keyword(s):  
High Temperature ◽  
Phase Change ◽  
Phase Change Material ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Change Material
Sign in / Sign up

Export Citation Format

Share Document