James Hamlin

Associate Professor of Physics at U. Florida studying high pressure effects in superconducting and magnetic materials.

[James Hamlin @JazHambo]

@Shaw32314770446 @dangaristo @whippletom ?

[James Hamlin @JazHambo]

@dangaristo Simon found issues involving similarities between R vs P data for different materials (SiS2, SnS2, and OCS). The similarities are such that it is very difficult to understand how these datasets could be independently measured in the lab. See https://t.co/QchZjXuaWs. (8/8)

[James Hamlin @JazHambo]

@dangaristo I found that the 43 GPa R vs T data for CS2 in Fig. 4.10 was identical, but for a scale factor of 4, to the 35 GPa data for SnS2 in Fig. 5.10. This is illustrated in the figure here, where both data sets have been plotted on different y-axes of same graph. (7/8)

[James Hamlin @JazHambo]

@BFieldSource @Robotbeat @andrewmccalip https://t.co/MXvgumpRia

[James Hamlin @JazHambo]

@BFieldSource @Robotbeat @andrewmccalip 15 years ago I spent about 4 hours thinking I'd discovered a new high Tc for exactly that reason. It was FM, but remnant field of QD MPMS was simply locking in a negative magnetization during zero field cooling. 2/2

[James Hamlin @JazHambo]

@profanalytis Lol. I received something similar once from "Lindsay Lohan".

[Physical Review Letters @PhysRevLett]

The paper

“Colossal Density-Driven Resistance Response in the Negative Charge Transfer Insulator MnS₂”

has been retracted by 9 of the 10 authors.

Letter: https://t.co/D1W2t2OSJg
Retraction: https://t.co/be95kRCHrK

[James Hamlin @JazHambo]

@VanGennepD @Kaju_Nut On your second point I think it was the _claims_ of the original paper that were trusted by many. That trust seemed not to hinge on any expert analysis of the data.

[James Hamlin @JazHambo]

@QM_phys_kyoto Cu2S

[James Hamlin @JazHambo]

@QM_phys_kyoto I agree. It seems they may have just misinterpreted the CuS2 resistance drop and diamagnetic transition.

[James Hamlin @JazHambo]

@JensenTeal @VanGennepD Maybe superparamagnetism for LK99?

[James Hamlin @JazHambo]

@andrewmccalip @MikeyMi76588200 @Piltzintec @ChadBowman0 @VanGennepD Does it zoom to the edge of the magnet? That is where the field is largest (for a disc magnet). https://t.co/QmxaryhyH4

[Derrick VanGennep @VanGennepD]

I was able to closely mimic the “levitation” behavior of LK-99 with a ferromagnetic sample.

For comparison, see the original LK-99 video in the tweet below.

[James Hamlin @JazHambo]

A superconductor optimized for strong pinning is inside the liquid-nitrogen-filled styrofoam cup. The levitating "puck" is a permanent magnet.

Apologies that I can not recall the name of the speaker who brought this to WUSTL Physics around 2010!

https://t.co/p0WAiAwrrs