Were the Basic Physics Underlying High Temperature Superconductivity

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Presentation transcript:

Were the Basic Physics Underlying High Temperature Superconductivity UC Merced Were the Basic Physics Underlying High Temperature Superconductivity Revealed in 1941? Paul Michael Grant Aging IBM Pensioner Principal, W2AGZ Technologies w2agz@w2agz.com Please view in “slide show” mode!

The Great Colossal Quantum Conundrum of HTSC in Cuprates, Ferrous Oxides, etc. “SDW” “NEEL” “A-F” T “Funny Metal” “Pseudogap” “Fond AF Memories” “Real Metal” “Fermi Liquid” U = 3 U = 0 “Funny Metal” “Pseudogap” “Fond AF Memories” U = 6 Is HTSC driven by “shakes or spins” ...or both? Well? Superconductivity g* “Insulator” “Conductor” g “Order Parameter” (charge, magnetic field, pressure...whatever)

What’s Past (May Be) Prologue Attributed to Bill S., edited by Paul G. Did this former Harvard/MIT postdoc guess the mechanism 76 years ago? !

Chauncey Starr 1912 - 2007 The Physics Years (1936 - 1943) Birth of the Nuclear Age (1944 - 1965) UCLA & Risk Analysis (1966 - 1971) The EPRI Years (1972 - 2007) Please Visit Chauncey’s Page at www.w2agz.com

Casimir-du Pre’ (Physica V, 1938) & Starr (PR 60, 1941)

...Continued...

“Chauncey’s Rig” It’s a “lock-in amplifier!” (aka phase sensitive detector) Starr was the first to apply PSD methods to measurement of thermal conductivity and likely saved the Nobel Prize award to Percy Bridgman (that’s another story)

TM Compounds Studied at 77K OK...but now, what about having a look at copper oxide perovskites and iron pnictides hopefully uncovering phonon-spin coupling as a pairing mechanism for HTSC?

Macfarlane, Rosen, Seki, SSC 63, 831 (1987) Raman Spectroscopy of YBCO The Shakes Are There! Macfarlane, Rosen, Seki, SSC 63, 831 (1987) Raman Spectroscopy of YBCO We can see Phonons have been around ever since the Creation of HTSC! ...And so have Spins! (Cu3+/Cu2+)

What a Great PhD Thesis Project! Thoroughly review the 1941 Starr paper and all its references. Configure an appropriate PSD setup with a cryogenic sample chamber between 10 T dipoles. Check out a few of the Starr measurements on paramagnetic compounds of Fe, Mn and/or Cr. Then grind up some Y-123 (with various oxgyen levels), and measure...if results mimic Chauncey 1941... Derive an alternative to McMillan-Eliashberg fermion-fermion coupling which contains spins as well as phonons, and apply. If it “works,” then... Prepare for an eventual trip to Stockholm!