Thermally driven low-spin∕high-spin phase transitions in solids

2005 ◽  
Vol 72 (2) ◽  
Author(s):  
S. W. Biernacki ◽  
B. Clerjaud
Keyword(s):  
Phase Transitions ◽  
High Spin ◽  
Thermally Driven

scholarly journals Fermi surface reconstruction and multiple quantum phase transitions in the antiferromagnet CeRhIn5

2015 ◽  
Vol 112 (3) ◽  
pp. 673-678 ◽  
Author(s):  
Lin Jiao ◽  
Ye Chen ◽  
Yoshimitsu Kohama ◽  
David Graf ◽  
E. D. Bauer ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Fermi Surface ◽  
Quantum Phase Transitions ◽  
Continuous Phase ◽  
Multiple Quantum ◽  
Quantum Critical Points ◽  
Thermally Driven ◽  
Significant Step ◽  
Open Issues

Conventional, thermally driven continuous phase transitions are described by universal critical behavior that is independent of the specific microscopic details of a material. However, many current studies focus on materials that exhibit quantum-driven continuous phase transitions (quantum critical points, or QCPs) at absolute zero temperature. The classification of such QCPs and the question of whether they show universal behavior remain open issues. Here we report measurements of heat capacity and de Haas–van Alphen (dHvA) oscillations at low temperatures across a field-induced antiferromagnetic QCP (Bc0 ≈ 50 T) in the heavy-fermion metal CeRhIn5. A sharp, magnetic-field-induced change in Fermi surface is detected both in the dHvA effect and Hall resistivity at B0* ≈ 30 T, well inside the antiferromagnetic phase. Comparisons with band-structure calculations and properties of isostructural CeCoIn5 suggest that the Fermi-surface change at B0* is associated with a localized-to-itinerant transition of the Ce-4f electrons in CeRhIn5. Taken in conjunction with pressure experiments, our results demonstrate that at least two distinct classes of QCP are observable in CeRhIn5, a significant step toward the derivation of a universal phase diagram for QCPs.

Structural Investigation of the Photoinduced Spin Transition in the [Fe(PM-BiA)2(NCS)2] Compound

2006 ◽  
Vol 112 ◽  
pp. 81-88 ◽  
Author(s):  
Kouhei Ichiyanagi ◽  
Johan Hebert ◽  
Loic Toupet ◽  
Hérve Cailleau ◽  
Eric Collet ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Low Temperature ◽  
High Spin ◽  
Thermal Equilibrium ◽  
Molecular Crystal ◽  
Structural Investigation ◽  
Spin Transition ◽  
X Ray Diffraction ◽  
Structural Reorganization ◽  
X Ray

We investigated the thermo- and photo-induced phase transitions between low spin (LS) and high spin (HS) states of the molecular crystal of [Fe(PM-BiA)2(NCS)2] in the orthorhombic form, by using X-ray diffraction. The structure of the photoinduced HS state, generated from the LS state at low temperature, is compared to the structures of the HS and LS phases at thermal equilibrium and to the thermally trapped HS state. The preliminary results presented here show that the structural reorganization is similar in the different HS states.

scholarly journals Martensitic organic crystals as soft actuators

2019 ◽  
Vol 10 (31) ◽  
pp. 7327-7332 ◽  
Author(s):  
Liang Li ◽  
Patrick Commins ◽  
Marieh B. Al-Handawi ◽  
Durga Prasad Karothu ◽  
Jad Mahmoud Halabi ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Molecular Crystals ◽  
Martensitic Phase ◽  
Organic Crystals ◽  
Complete Structure ◽  
Martensitic Phase Transitions ◽  
Thermally Driven ◽  
Structure Switching ◽  
Soft Actuators

Being capable of rapid and complete structure switching, the martensitic phase transitions in molecular crystals are thought to hold a tremendous potential as thermally driven organic actuators.

MONTE CARLO METHODS FOR FIRST ORDER PHASE TRANSITIONS: SOME RECENT PROGRESS

1992 ◽  
Vol 03 (05) ◽  
pp. 1025-1058 ◽  
Author(s):  
KURT BINDER ◽  
KATHARINA VOLLMAYR ◽  
HANS-PETER DEUTSCH ◽  
JOSEPH D. REGER ◽  
MANFRED SCHEUCHER ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Capillary Condensation ◽  
Finite Size ◽  
Wetting Transition ◽  
Parallel Plates ◽  
Polymer Mixtures ◽  
First Order ◽  
Thermally Driven ◽  
Integration Techniques ◽  
First Order Phase

This brief review discusses methods to locate and characterize first order phase transitions, paying particular attention to finite size effects. In the first part, the order parameter probability distribution and its fourth-order cumulant is discussed for thermally driven first-order transitions (the 3-state Potts model in d=3 dimensions is treated as an example). First-order transitions are characterized by a minimum of the cumulant, which gets very deep for large enough systems. In the second part, we discuss how to locate first order phase boundaries ending in a critical point in a large parameter space. As an example, the study of the unmixing transition of asymmetric polymer mixtures by a combination of histogram techniques and finite size scaling is described. As a final problem, we discuss the shift of the gas-liquid condensation in thin-film geometry confined between two parallel plates due to boundary fields (“capillary condensation”). Being interested in temperatures far below bulk criticality (e. g. near the wetting transition), special thermodynamic integration techniques are the method of choice, rather than the use of finite sizes scaling to map out the (asymmetric) phase diagram.

scholarly journals Thermally Driven Membrane Phase Transitions Enable Content Reshuffling in Primitive Cells

2021 ◽  
Author(s):  
Roger Rubio-Sánchez ◽  
Derek K. O’Flaherty ◽  
Anna Wang ◽  
Francesca Coscia ◽  
Gianluca Petris ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Membrane Phase ◽  
Thermally Driven

Thermally driven phase transitions near the percolation threshold in two dimensions

1976 ◽  
Vol 9 (20) ◽  
pp. L553-L560 ◽  
Author(s):  
H E Stanley ◽  
R J Birgeneau ◽  
P J Reynolds ◽  
J F Nicoll
Keyword(s):  
Phase Transitions ◽  
Percolation Threshold ◽  
Two Dimensions ◽  
Thermally Driven

Pressure effect on temperature induced high-spin–low-spin phase transitions

2002 ◽  
Vol 277 (2) ◽  
pp. 125-129 ◽  
Author(s):  
G.G. Levchenko ◽  
V. Ksenofontov ◽  
A.V. Stupakov ◽  
H. Spiering ◽  
Y. Garcia ◽  
...  
Keyword(s):  
Phase Transitions ◽  
High Spin ◽  
Pressure Effect

scholarly journals Machines for Materials and Materials for Machines: Metal-Insulator Transitions and Artificial Intelligence

2021 ◽  
Vol 9 ◽  
Author(s):  
Jennifer Fowlie ◽  
Alexandru Bogdan Georgescu ◽  
Bernat Mundet ◽  
Javier del Valle ◽  
Philippe Tückmantel
Keyword(s):  
Artificial Intelligence ◽  
Machine Learning ◽  
Rare Earth ◽  
Phase Transitions ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Network Analyses ◽  
Correlated Electron ◽  
Thermally Driven

In this perspective, we discuss the current and future impact of artificial intelligence and machine learning for the purposes of better understanding phase transitions, particularly in correlated electron materials. We take as a model system the rare-earth nickelates, famous for their thermally-driven metal-insulator transition, and describe various complementary approaches in which machine learning can contribute to the scientific process. In particular, we focus on electron microscopy as a bottom-up approach and metascale statistical analyses of classes of metal-insulator transition materials as a bottom-down approach. Finally, we outline how this improved understanding will lead to better control of phase transitions and present as an example the implementation of rare-earth nickelates in resistive switching devices. These devices could see a future as part of a neuromorphic computing architecture, providing a more efficient platform for neural network analyses – a key area of machine learning.

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