Unconventional density wave in the pseudogap phase of high Tc cuprates

2002 ◽  
Vol 12 (9) ◽  
pp. 45-48
Author(s):  
K. Maki ◽  
B. Dora ◽  
A. Virosztek
Keyword(s):  
Spin Density ◽  
Density Wave ◽  
Spin Density Wave ◽  
High Tc ◽  
Pseudogap Phase ◽  
High Tc Cuprates ◽  
Optical Dichroism

We propose here that the pseudogap phase of high Tc superconductors is probably unconventional spin density wave (USDW). We present our analysis on the angular dependent magnetoresistance (ADMR) in the pseudogap phase which should be accessible experimentally. Also this result applies also to the AF phase of URu2Si2. We show that this model is consistent with the optical dichroism seen by ARPES.

scholarly journals MICROMAGNETISM IN URu2Si2 AND HIGH TEMPERATURE SUPERCONDUCTORS

2002 ◽  
Vol 16 (11n12) ◽  
pp. 1667-1671 ◽  
Author(s):  
ATTILA VIROSZTEK ◽  
KAZUMI MAKI ◽  
BALÁZS DÓRA
Keyword(s):  
High Temperature ◽  
Neutron Scattering ◽  
Spin Density ◽  
High Temperature Superconductors ◽  
Density Wave ◽  
Spin Density Wave ◽  
Scattering Data ◽  
Density Waves ◽  
Pseudogap Phase ◽  
Optical Dichroism

It has been proposed, that unconventional density waves (UDW) are possible candidates for systems with hidden order parameter. Unlike in conventional density waves, no periodic modulation of either the charge-, or the spin-density is present in UDW, in spite of a clear thermodynamic signal. Although the unconventional spin density wave (USDW) has been suggested for the "antiferromagnetic" phase of URu2Si2 , the micromagnetism seen by neutron scattering has not been understood. We present here the calculation of the local spin density due to impurities in USDW, which describes quantitatively the neutron scattering data by Amitsuka et al. Further, we propose that the pseudogap phase in high temperature superconductors (HTSC) should also be USDW. Strong evidence for this are the micromagnetism seen by Sidis et al., and the optical dichroism seen by Campuzano et al.

ANOMALOUS SPIN DENSITY WAVE SUPERCONDUCTIVITY IN CUPRATE HIGH-Tc SUPERCONDUCTORS

2009 ◽  
Vol 23 (12) ◽  
pp. 1533-1538
Author(s):  
JE HUAN KOO ◽  
JUNG-HYUN KIM ◽  
JONG-MUN JEONG ◽  
GUANGSUP CHO ◽  
JONG-JEAN KIM
Keyword(s):  
Spin Density ◽  
Density Wave ◽  
Spin Density Wave ◽  
Charge Density Waves ◽  
Electron Interaction ◽  
Cooper Pairs ◽  
Linear Temperature Dependence ◽  
Density Waves ◽  
Linear Temperature ◽  
High Tc

Spin density waves (SDWs) may be thought of as comprising charge density waves (CDWs) in pairs, with one CDW composed of up-spin electrons and the other composed of down-spin electrons. The superconductivity in cuprates may then be said to be caused by the BCS-type pairing of these SDWs. This is no longer a simple Cooper pairing of singlet electrons but one that involves a collection of Cooper pairs. Transport in normal metallic states is then governed by CDW pinning, as in a quantum well that is characterized by linear temperature dependence. The pseudo-gap may be understood as originating from this BCS-type gap with SDW, where the parameters used are from those of the original BCS scheme except that the electron–electron interaction is multiplied by N CDW , which is the number of electrons that have the same spin direction belonging to one CDW branch of the pair that comprises the SDW.

Band Structure Features and Concentration Phase Transitions in Oxide High-Tc System

1998 ◽  
Vol 12 (29n31) ◽  
pp. 2999-3001 ◽  
Author(s):  
A. I. Golovashkin ◽  
N. V. Anshukova ◽  
L. I. Ivanova ◽  
A. P. Rusakov
Keyword(s):  
Phase Transitions ◽  
Band Structure ◽  
Spin Density ◽  
Density Wave ◽  
Spin Density Wave ◽  
Experimental Results ◽  
High Tc

It is shown that consideration of harge density wave (CDW) in addition to spin density wave (SDW) allows for the better explanation of the new experimental results.

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