Stripe%20Ordering%20in%20the%20Cuprates

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Stripe Ordering in the Cuprates

• Leland Harriger
• Homework Project for Solid State II
• Instructor Elbio Dagotto
• Physics Dept., University of Tennessee at
  Knoxville
• Spring 2009

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What is Stripe Ordering?

• A periodic modulation of charge and spin.
• Modulation of charge and spin are related by the
  phase boundary.
• Result Spin periodicity is twice that of charge
  periodicity

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Why does Stripe Ordering Occur?
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The Distance that Separates.
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Scattering Basics (Preclude to testing for stripe
ordering.)
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Magnetic Scattering
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Reciprocal Space of CuO4 in the Presence of
Stripe Ordering.

• Big Circles are nuclear Bragg peaks.
• Small plusses are magnetic Bragg peaks.
• Other symbols are incommensurate spreading of
  peaks due to stripe ordering.

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Estimate of d as a function of x.
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Neutron Scattering

• The triple axis spectrometer is very versatile
  for measurements of bulk solids.
• Q-scans (ie momentum transfer)
• Both elastic and inelastic
• Typically performed at a fixed energy transfer.
• Energy Scans
• Set E0 for elastic scans
• Typically performed at a fixed Q.

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What Proof do We have of Stripe Ordering?
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What does Stripe Ordering Mean for
Superconductivity?
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References

• 1 J. Orenstein, et. al Science 288, 468 (2000)
• J. Tranquada, et. al. Nature 375, 561
• J. Tranquada, et. al. Phys. Rev. Lett. 78, 338
• S. Chi, et. al. Phys. Rev. Lett. 102 107005
• Ph. Bourges, et. al. Physica C 424, 45
• Yamada K. et. al. Phys. Rev. B 57 6165