Peak Effect as Precursor to Lock-in State in Bi2Sr2CaCu2O8+δ Single Crystal

2006 ◽  
Author(s):  
J. Mirkovic ◽  
K. Murata ◽  
A. Nakano ◽  
T. Yamamoto ◽  
I. Kakeya ◽  
...  
Keyword(s):  
Single Crystal ◽  
Peak Effect ◽  
Lock In

Observation of lock-in phenomena in heavy-ion-irradiated single crystal ofBa(Fe0.93Co0.07)2As2

2014 ◽  
Vol 89 (2) ◽  
Author(s):  
Toshihiro Taen ◽  
Hidenori Yagyuda ◽  
Yasuyuki Nakajima ◽  
Tsuyoshi Tamegai ◽  
Oscar Ayala-Valenzuela ◽  
...  
Keyword(s):  
Single Crystal ◽  
Heavy Ion ◽  
Lock In

Angular dependent study of the peak effect phenomenon in a weakly pinned single crystal of LuNi2B2C

2007 ◽  
Vol 460-462 ◽  
pp. 1215-1217 ◽  
Author(s):  
D. Jaiswal Nagar ◽  
T. Isshiki ◽  
N. Kimura ◽  
H. Aoki ◽  
S. Ramakrishnan ◽  
...  
Keyword(s):  
Single Crystal ◽  
Peak Effect

Dimensional crossover and peak effect in a superconducting Pr1.85Ce0.15CuO4-y single crystal

1997 ◽  
Vol 273 (3-4) ◽  
pp. 268-274 ◽  
Author(s):  
M.C. de Andrade ◽  
G. Triscone ◽  
M.B. Maple ◽  
S. Spagna ◽  
J. Diederichs ◽  
...  
Keyword(s):  
Single Crystal ◽  
Peak Effect ◽  
Dimensional Crossover

Peak effect of critical current in a Bi-2212 superconducting single crystal

1998 ◽  
Vol 11 (10) ◽  
pp. 925-928 ◽  
Author(s):  
T Matsushita ◽  
T Hirano ◽  
H Yamato ◽  
M Kiuchi ◽  
Y Nakayama ◽  
...  
Keyword(s):  
Single Crystal ◽  
Critical Current ◽  
Peak Effect

The α ↔ β phase transitions of Zn2P2O7revisited: existence of an additional intermediate phase with an incommensurately modulated structure

2014 ◽  
Vol 70 (3) ◽  
pp. 539-554 ◽  
Author(s):  
Berthold Stöger ◽  
Matthias Weil ◽  
Michal Dušek
Keyword(s):  
Phase Transitions ◽  
Single Crystal ◽  
Intermediate Phase ◽  
Group Symmetry ◽  
Mirror Plane ◽  
Internal Space ◽  
Scanning Calorimetry ◽  
First Order ◽  
Β Phase ◽  
Lock In

Zn2P2O7crystallizes in a thortveitite-like structure and features temperature-dependent polymorphism. At high temperatures (T> 500 K), the aristotype phase β-Zn2P2O7(C2/m,Z= 2,a≃ 6.60,b≃ 8.28,c≃ 4.53 Å, β ≃ 105.4°) is stable. At lower temperatures the lock-in phase α1-Zn2P2O7[at 350 K:I2/c,Z= 12,a= 20.1131 (13),b= 8.2769 (6),c= 9.109 (3) Å, β = 106.338 (16)°], a sixfold superstructure with commensurate modulation vectorq= (1/3, 0, 1/2), is stable. Between the stability ranges of the α1- and β-phases exists the intermediate, incommensurately modulated α2-Zn2P2O7phase with modulation wavevectorq≃ (0.33, 0, 0.40) andC2/m(α, 0, γ)0ssuperspace group symmetry. The α1→ α2lock-in phase transition atTL= 408 K is of first-order and features virtually no hysteresis. It is immediately followed by the second-order α2→ β transition to the non-modulated phase atTI≃ 430 K. This transformation is sluggish and even atT= 500 K very weak satellite reflections of the α2-phase were observed. Both phase transitions were analyzed with differential scanning calorimetry and high-temperature powder and single-crystal X-ray diffraction. The crystal structures of the α1- and α2-phases were refined from single crystal data collected atT= 350, 400, 405, 410, 415, 420, 425, 430, 450 and 500 K. Different models describing the slow transition from the incommensurately modulated α2- to the non-modulated β-phase were tested. In the model resulting in the best residuals, the bridging O atom of the [P2O7] group, which is located on a 2/mposition in the basic structure, is described as an overlap of an atom ordered in internal space and one atom disordered around the mirror plane. The occupancy of the ordered atom decreases with temperature until atT= 500 K virtually only the disordered atom remains. Simultaneously, the amplitude of the modulation functions of the remaining atoms decreases, so that theT= 500 K structure can be considered as theC2/maristotype structure, although the diffraction pattern still features satellite reflections of first order with very low intensities.

Anomalous peak effect in Bi2Sr2CaCu2Oy single crystal system

1994 ◽  
Vol 235-240 ◽  
pp. 2819-2820 ◽  
Author(s):  
H. Ikeda ◽  
D.S. Jeon ◽  
M. Akamatu ◽  
R. Yoshizaki
Keyword(s):  
Single Crystal ◽  
Peak Effect ◽  
Crystal System ◽  
Anomalous Peak

Anomalous peak effect in single crystal Bi2Sr2CaCu2O8+ studied by Hall probe magnetometry

1993 ◽  
Vol 213 (1-2) ◽  
pp. 33-42 ◽  
Author(s):  
T. Tamegai ◽  
Y. Iye ◽  
I. Oguro ◽  
K. Kishio
Keyword(s):  
Single Crystal ◽  
Peak Effect ◽  
Hall Probe ◽  
Anomalous Peak
Sign in / Sign up

Export Citation Format

Share Document