First-Order Vortex-Lattice Phase Transition in(La1−xSrx)2CuO4Single Crystals: Universal Scaling of the Transition Lines in High-Temperature Superconductors

1998 ◽  
Vol 80 (19) ◽  
pp. 4297-4300 ◽  
Author(s):  
T. Sasagawa ◽  
K. Kishio ◽  
Y. Togawa ◽  
J. Shimoyama ◽  
K. Kitazawa
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Vortex Lattice ◽  
High Temperature Superconductors ◽  
Universal Scaling ◽  
First Order

ORDER OF PHASE TRANSITION IN HIGH TEMPERATURE SUPERCONDUCTIVITY

1989 ◽  
Vol 03 (02) ◽  
pp. 135-139 ◽  
Author(s):  
T.D. LEE
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
High Temperature Superconductivity ◽  
High Temperature Superconductors ◽  
First Order ◽  
Order Of Phase Transition

We present arguments that the phase transition in some of the newly discovered high temperature superconductors is first-order, unlike the usual Λ-transition.

High-temperature X-ray powder diffraction study of the tetragonal-cubic phase transition in nanocrystalline, compositionally homogeneous ZrO2–CeO2 solid solutions

2008 ◽  
Vol 23 (S1) ◽  
pp. S70-S74 ◽  
Author(s):  
L. M. Acuña ◽  
R. O. Fuentes ◽  
D. G. Lamas ◽  
I. O. Fábregas ◽  
N. E. Walsöe de Reca ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
High Temperature ◽  
Powder Diffraction ◽  
Solid Solutions ◽  
Tetragonal Phase ◽  
Room Temperature ◽  
Cubic Phase ◽  
X Ray ◽  
First Order

Crystal structure of compositionally homogeneous, nanocrystalline ZrO2–CeO2 solutions was investigated by X-ray powder diffraction as a function of temperature for compositions between 50 and 65 mol % CeO2. ZrO2-50 and 60 mol % CeO2 solid solutions, which exhibit the t′-form of the tetragonal phase at room temperature, transform into the cubic phase in two steps: t′-to-t″ followed by t″-to-cubic. But the ZrO2-65 mol % CeO2, which exhibits the t″-form, transforms directly to the cubic phase. The results suggest that t′-to-t″ transition is of first order, but t″-to-cubic seems to be of second order.

High Temperature Phase Transitions in BiFeO3

2009 ◽  
Vol 1199 ◽  
Author(s):  
Donna Arnold ◽  
Christopher M Kavanagh ◽  
Philip Lightfoot ◽  
Finlay Doogan Morrison
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Order Phase Transition ◽  
Structure Type ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
First Order ◽  
Β Phase ◽  
First Order Phase Transition ◽  
First Order Phase

AbstractThe high temperature phases of BiFeO3 have courted much controversy with many conflicting structural models reported, in particular for the paraelectric β-phase. High temperature powder neutron diffraction (PND) experiments indicate that the ferroelectric (R3c) α-phase transforms to the paraelectric β-phase at approximately 820 °C via a first order phase transition. We demonstrate that this phase is unambiguously orthorhombic, adopting the GdFeO3 structure-type with a space group Pbnm. On further heating BiFeO3 undergoes another first order phase transition (β-γ) at approximately 930 °C which is marked by a discontinuous decrease in cell volume consistent with an insulator-metal transition. Close inspection of the PND data show no evidence of any symmetry change, with the postulated γ-phase remaining orthorhombic Pbnm. In addition we present PND and impedance spectroscopy data for BiFeO3 which suggest that the so-called ‘Połomska’ transition observed by some authors at approximately 185 °C is not intrinsic.

WETTING OF HOT GLUONS

1992 ◽  
Vol 03 (05) ◽  
pp. 939-946 ◽  
Author(s):  
U.-J. WIESE
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Gauge Theory ◽  
Bubble Nucleation ◽  
Polyakov Loop ◽  
Effective Theory ◽  
Complete Wetting ◽  
First Order ◽  
Pure Gauge Theory ◽  
Deconfinement Phase Transition

In the SU(3) pure gauge theory the high temperature deconfinement phase transition is first order. At the transition the confined phase coexists with three distinct deconfined phases. The interfaces separating the various phases show universal critical behavior when the confined phase completely wets the deconfined-deconfined interfaces. The critical exponents of complete wetting are derived from an interface solution of a Z(3) symmetric effective theory for the Polyakov loop. When complete wetting occurs in the pure glue theory the deconfinement transition proceeds via domain wall splitting. When quarks are present wetting disappears and the standard bubble nucleation scenario applies.

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