scholarly journals QUASIPARTICLE SPECTROSCOPY AND HIGH-FIELD PHASE DIAGRAMS OF CUPRATE SUPERCONDUCTORS – AN INVESTIGATION OF COMPETING ORDERS AND QUANTUM CRITICALITY

2005 ◽  
Vol 19 (01n03) ◽  
pp. 285-294 ◽  
Author(s):  
N.-C. YEH ◽  
C.-T. CHEN ◽  
V. S. ZAPF ◽  
A. D. BEYER ◽  
C. R. HUGHES ◽  
...  
Keyword(s):  
High Field ◽  
Cuprate Superconductors ◽  
Density Wave ◽  
Quantum Critical Point ◽  
Spin Density Wave ◽  
Tunneling Current ◽  
Scanning Tunneling ◽  
Field Phase ◽  
Competing Order ◽  
Competing Orders

We present scanning tunneling spectroscopic and high-field thermodynamic studies of hole- and electron-doped (p- and n-type) cuprate superconductors. Our experimental results are consistent with the notion that the ground state of cuprates is in proximity to a quantum critical point (QCP) that separates a pure superconducting (SC) phase from a phase comprised of coexisting SC and a competing order, and the competing order is likely a spin-density wave (SDW). The effect of applied magnetic field, tunneling current, and disorder on the revelation of competing orders and on the low-energy excitations of the cuprates is discussed.

scholarly journals MAGNETIC FIELD TUNING OF CHARGE AND SPIN ORDER IN THE CUPRATE SUPERCONDUCTORS

2002 ◽  
Vol 16 (20n22) ◽  
pp. 3156-3163 ◽  
Author(s):  
A. POLKOVNIKOV ◽  
S. SACHDEV ◽  
M. VOJTA ◽  
E. DEMLER
Keyword(s):  
Magnetic Field ◽  
Ground State ◽  
Charge Density Wave ◽  
Cuprate Superconductors ◽  
Density Wave ◽  
Spin Density Wave ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Spin Order ◽  
New Information

Recent neutron scattering, nuclear magnetic resonance, and scanning tunneling microscopy experiments have yielded valuable new information on the interplay between charge and spin density wave order and superconductivity in the cuprate superconductors, by using a perpendicular magnetic field to tune the ground state properties. We compare the results of these experiments with the predictions of a theory which assumed that the ordinary superconductor was proximate to a quantum transition to a superconductor with co-existing spin/charge density wave order.

High-field magnetoresistance of the Bechgaard salt (TMTSF)2AsF6:Fast oscillations and spin-density-wave transition

1997 ◽  
Vol 55 (5) ◽  
pp. 3024-3027 ◽  
Author(s):  
Jean Pierre Ulmet ◽  
Abdelhadi Narjis ◽  
Michael J. Naughton ◽  
Jean Marc Fabre
Keyword(s):  
Spin Density ◽  
High Field ◽  
Density Wave ◽  
Spin Density Wave ◽  
Bechgaard Salt ◽  
Fast Oscillations

Rapid oscillation of Hall resistance in high field spin-density-wave phase for (TMTSF)2ClO4

1998 ◽  
Vol 246-247 ◽  
pp. 121-124 ◽  
Author(s):  
S. Uji ◽  
J.S. Brooks ◽  
S. Takasaki ◽  
J. Yamada ◽  
H. Anzai
Keyword(s):  
Spin Density ◽  
High Field ◽  
Density Wave ◽  
Spin Density Wave ◽  
Hall Resistance ◽  
Rapid Oscillation ◽  
Wave Phase

High-field magnetoresistance of the Bechgaard salt (TMTSF)2NO3: Quantum oscillations in the spin-density-wave state and phase transitions

1994 ◽  
Vol 50 (17) ◽  
pp. 12726-12732 ◽  
Author(s):  
Alain Audouard ◽  
Frédéric Goze ◽  
Jean-Pierre Ulmet ◽  
Luc Brossard ◽  
Salomon Askenazy ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Spin Density ◽  
High Field ◽  
Density Wave ◽  
Spin Density Wave ◽  
Wave State ◽  
Quantum Oscillations ◽  
Bechgaard Salt

Magnetic Evidence for Reentrant Field-Induced Spin Density Waves

1989 ◽  
Vol 173 ◽  
Author(s):  
M. J. Naughton ◽  
R. V. Chamberlin ◽  
X. Yan ◽  
P. M. Chaikin ◽  
L. Y. Chiang
Keyword(s):  
Magnetic Field ◽  
Spin Density ◽  
High Field ◽  
Density Wave ◽  
Spin Density Wave ◽  
Metallic Phase ◽  
Wave State ◽  
T Phase ◽  
Resistance Data ◽  
The Magnetic Field

ABSTRACTHigh magnetic field (to 31T) d.c. magnetization measurements on the quasi-one dimensional organic conductor (TMTSF) 2ClO4 yield thermodynamic evidence for the reentrance of a metallic phase from the magnetic field-induced spin density wave state. The H-T phase diagram developed previously from magnetotransport measurements is reproduced from 8 to 26 tesla. The reentrance occurs as a sharp collapse of M(H) to (near) zero magnetization in the high field metal phase. For fields above 27 tesla, deHaas-van Alphen-like oscillations appear, similar to earlier resistance data, as well as other features possibly signifying multiple transitions in the very high field regime.

DOES THE HEAVY ELECTRON MAINTAIN ITS INTEGRITY AT QUANTUM CRITICAL POINT?

2002 ◽  
Vol 16 (20n22) ◽  
pp. 2991-2991
Author(s):  
P. COLEMAN
Keyword(s):  
Critical Point ◽  
Density Wave ◽  
Quantum Critical Point ◽  
Spin Density Wave ◽  
Electron Mass ◽  
Heavy Electron ◽  
Heavy Fermion Materials ◽  
Quantum Critical ◽  
Composite Nature ◽  
Quantum Critical Behavior

This talk will discuss non-Fermi liquid and quantum critical behavior in heavy fermion materials, focussing on the mechanism by which the electron mass appears to diverge at the quantum critical point. Is the quantum critical point merely a case of electron diffraction off a quantum critical spin density wave, or does it involve a fundamental break-down in the composite nature of the heavy electron place at the quantum critical point? We discuss the nature of the critical langrangian and show that the Hall constant changes continuously in the first scenario, but may "jump" discontinuously at a quantum critical point where the composite character of the electron quasiparticles changes.

scholarly journals Ideal charge-density-wave order in the high-field state of superconducting YBCO

2016 ◽  
Vol 113 (51) ◽  
pp. 14645-14650 ◽  
Author(s):  
H. Jang ◽  
W.-S. Lee ◽  
H. Nojiri ◽  
S. Matsuzawa ◽  
H. Yasumura ◽  
...  
Keyword(s):  
Charge Density ◽  
Critical Field ◽  
Ground State ◽  
Charge Density Wave ◽  
High Field ◽  
Cuprate Superconductors ◽  
Density Wave ◽  
Quantum Oscillation ◽  
Zero Field ◽  
Correlation Volume

The existence of charge-density-wave (CDW) correlations in cuprate superconductors has now been established. However, the nature of the CDW ground state has remained uncertain because disorder and the presence of superconductivity typically limit the CDW correlation lengths to only a dozen unit cells or less. Here we explore the field-induced 3D CDW correlations in extremely pure detwinned crystals of YBa2Cu3O2(YBCO) ortho-II and ortho-VIII at magnetic fields in excess of the resistive upper critical field (Hc2) where superconductivity is heavily suppressed. We observe that the 3D CDW is unidirectional and possesses a long in-plane correlation length as well as significant correlations between neighboring CuO2planes. It is significant that we observe only a single sharply defined transition at a critical field proportional toHc2, given that the field range used in this investigation overlaps with other high-field experiments including quantum oscillation measurements. The correlation volume is at least two to three orders of magnitude larger than that of the zero-field CDW. This is by far the largest CDW correlation volume observed in any cuprate crystal and so is presumably representative of the high-field ground state of an “ideal” disorder-free cuprate.

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