scholarly journals Quantum Phase Transition in the Magnetic-Field-Induced Normal State of Optimum-Doped High-TcCuprate Superconductors at Low Temperatures

2009 ◽  
Vol 102 (1) ◽  
Author(s):  
F. F. Balakirev ◽  
J. B. Betts ◽  
A. Migliori ◽  
I. Tsukada ◽  
Yoichi Ando ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Quantum Phase Transition ◽  
Normal State ◽  
Low Temperatures ◽  
Quantum Phase ◽  
The Magnetic Field

Transport Properties of Normal and Quasinormal States of Poor Superconductors

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3151-3156 ◽  
Author(s):  
Vsevolod Gantmakher
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Low Temperature ◽  
Single Crystals ◽  
Quantum Phase Transition ◽  
Normal State ◽  
Cooper Pairs ◽  
Two Dimensional ◽  
Field State ◽  
The Magnetic Field

There are some doubts whether materials near the superconductor–insulator transition (SIT), either on the insulating side, or with superconductivity suppressed by the magnetic field, behave like an ordinary metal. Two experiments in which this issue is addressed will be reviewed here, namely, transport measurements of two different materials: single crystals YBa2Cu3O 6+x (x ≈ 0.37) — a representative of the HTS family and amorphous InO x where x is the oxygen content which could be changed through moderate-temperature annealing. The low-temperature normal resistivity ρ(T) of YBaCuO crystals on both sides of SIT behaves as usual "bad" metal with conductivity below the Mott's minimum value. The amorphous In-O films behave differently. Those films with superconductivity do not display any characteristic magnetic field which can be interpreted as Bc2. Instead, they give out an example of a quantum phase transition and follow Fisher's model1 for "the field-tuned SIT in disordered two-dimensional superconductors" though they are not precisely two-dimensional and their high-magnetic-field state may not be insulating at all. Apparently, the normal state of InO x films comprises localized Cooper pairs.

scholarly journals Size dependent nature of the magnetic-field driven superconductor-to-insulator quantum-phase transitions

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Xiaofu Zhang ◽  
Adriana E. Lita ◽  
Huanlong Liu ◽  
Varun B. Verma ◽  
Qiang Zhou ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Quantum Phase Transition ◽  
Quantum Phase Transitions ◽  
Temperature Limit ◽  
Quantum Phase ◽  
Zero Temperature ◽  
Size Dependent ◽  
Open Question ◽  
The Magnetic Field

AbstractThe nature of the magnetic-field driven superconductor-to-insulator quantum-phase transition in two-dimensional systems at zero temperature has been under debate since the 1980s, and became even more controversial after the observation of a quantum-Griffiths singularity. Whether it is induced by quantum fluctuations of the superconducting phase and the localization of Cooper pairs, or is directly driven by depairing of these pairs, remains an open question. We herein experimentally demonstrate that in weakly-pinning systems and in the limit of infinitely wide films, a sequential superconductor-to-Bose insulator-to-Fermi insulator quantum-phase transition takes place. By limiting their size to smaller than the effective penetration depth, however, the vortex interaction alters, and the superconducting state re-enters the Bose-insulating state. As a consequence, one observes a direct superconductor-to-Fermi insulator in the zero-temperature limit. In narrow films, the associated critical-exponent products diverge along the corresponding phase boundaries with increasing magnetic field, which is a hallmark of the quantum-Griffiths singularity.

scholarly journals Magnetic-field induced quantum phase transition and critical behavior in a gapped spin system

2007 ◽  
Vol 310 (2) ◽  
pp. 1352-1354 ◽  
Author(s):  
F. Yamada ◽  
T. Ono ◽  
M. Fujisawa ◽  
H. Tanaka ◽  
T. Sakakibara
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Quantum Phase Transition ◽  
Spin System ◽  
Critical Behavior ◽  
Quantum Phase

scholarly journals Magnetic-field-tuned phase transition of a molecular material from the isolated-spin to the coupled-spin regime

2019 ◽  
Vol 21 (8) ◽  
pp. 4394-4407 ◽  
Author(s):  
Vinicius T. Santana ◽  
Beatriz N. Cunha ◽  
Ana M. Plutín ◽  
Rafael G. Silveira ◽  
Eduardo E. Castellano ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Quantum Phase Transition ◽  
Quantum Phase ◽  
Molecular Material ◽  
Epr Measurements

A quantum phase transition, as a consequence of spin-entanglements caused by Cu–Cu exchange couplings, explains EPR measurements in a new monomeric CuII compound.

Quantum-phase transition in HoNi2B2C tuned by a magnetic field

2004 ◽  
Vol 272-276 ◽  
pp. 263-264 ◽  
Author(s):  
M Ohashi ◽  
H Akiyama ◽  
G Oomi ◽  
B.K Cho ◽  
P.C Canfield
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Quantum Phase Transition ◽  
Quantum Phase
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