Magnetoelastic coupling, negative thermal expansion, and two-dimensional magnetic excitations in FeAs

2021 ◽  
Vol 103 (9) ◽  
Author(s):  
J. L. Niedziela ◽  
L. D. Sanjeewa ◽  
A. A. Podlesnyak ◽  
L. DeBeer-Schmitt ◽  
S. J. Kuhn ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Negative Thermal Expansion ◽  
Two Dimensional ◽  
Magnetic Excitations ◽  
Magnetoelastic Coupling

scholarly journals Negative thermal expansion and magnetoelastic coupling in the breathing pyrochlore lattice material LiGaCr4S8

2018 ◽  
Vol 97 (13) ◽  
Author(s):  
G. Pokharel ◽  
A. F. May ◽  
D. S. Parker ◽  
S. Calder ◽  
G. Ehlers ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Negative Thermal Expansion ◽  
Magnetoelastic Coupling ◽  
Lattice Material

Thermally boosted upconversion and downshifting luminescence in Sc2(MoO4)3:Yb/Er with two-dimensional negative thermal expansion

2021 ◽  
Author(s):  
Jinsheng Liao ◽  
Minghua Wang ◽  
Fulin Lin ◽  
Zhuo Han ◽  
Datao Tu ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Near Infrared ◽  
Negative Thermal Expansion ◽  
Thermal Quenching ◽  
Relative Sensitivity ◽  
Strong Temperature Dependence ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
Higher Temperature

Abstract Lanthanide (Ln3+)-doped phosphors generally suffer from thermal quenching, in which their photoluminescence (PL) intensities decrease at the higher temperature. Herein, we report a class of unique two-dimensional negative-thermal-expansion phosphor of Sc2(MoO4)3:Yb/Er. By virtue of the reduced distances between sensitizers and emitters as well as confined energy migration with increasing the temperature, a 45-fold enhancement of green upconversion (UC) luminescence and a 450-fold enhancement of near-infrared downshifting (DS) luminescence of Er3+ are achieved from 25 to 500 ˚C. The thermally boosted UC and DS luminescence mechanism is systematically investigated through in situ temperature-dependent Raman spectroscopy, synchrotron X-ray diffraction and PL dynamics. Moreover, the luminescence lifetime of 4I11/2 of Er3+ in Sc2(MoO4)3:Yb/Er displays a strong temperature dependence, enabling ratiometric thermometry with the highest relative sensitivity of 13.4%/K at 298 K. These findings may gain a vital insight into the design of negative-thermal-expansion Ln3+-doped phosphors for versatile applications.

Large Negative Thermal Expansion and Magnetoelastic Coupling in Metamagnetic Tetragonal (Mn, T)2Sb (T = Cr, V) Alloys

2020 ◽  
Vol 33 (9) ◽  
pp. 2551-2555
Author(s):  
Yuzhuo Yan ◽  
Jiancheng Yang ◽  
Ni Zhao ◽  
Guiquan Yao ◽  
Xiaoxiao Fu ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Negative Thermal Expansion ◽  
Magnetoelastic Coupling

CDW-induced negative thermal expansion in two-dimensional conductor η-Mo4O11

2003 ◽  
Vol 125 (1) ◽  
pp. 45-49 ◽  
Author(s):  
Hiroshi Negishi ◽  
Yoshihiro Kuroiwa ◽  
Hiroyasu Akamine ◽  
Shinobu Aoyagi ◽  
Akikatsu Sawada ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Negative Thermal Expansion ◽  
Two Dimensional

Cobalt adipate, Co(C6H8O4): antiferromagnetic structure, unusual thermal expansion and magnetoelastic coupling

2014 ◽  
Vol 1 (3) ◽  
pp. 332-337 ◽  
Author(s):  
Paul J. Saines ◽  
Phillip T. Barton ◽  
Marek Jura ◽  
Kevin S. Knight ◽  
Anthony K. Cheetham
Keyword(s):  
Thermal Expansion ◽  
Negative Thermal Expansion ◽  
Magnetoelastic Coupling ◽  
Antiferromagnetic Structure

Anisotropic negative thermal expansion, driven by magnetoelastic coupling, has been found in cobalt adipate and interpreted through understanding its antiferromagnetic structure.

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