"New" Type of Conductivity - CR4 Discussion Thread

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Randall Guru Join Date: Aug 2005 Location: Hemel Hempstead, UK Posts: 5826 Good Answers: 322	"New" Type of Conductivity 09/13/2018 5:03 AM
	This research looks as though it could lead to many new discoveries, and, hopefully applications. Cuprates: High-Temp Superconductors that Defy a Scientific Explanation ____________________________________________________________________ "A material already known for its unique behavior is found to carry current in a way never before observed." ____________________________________________________________________ In conventional metals, explained Shekhter, resistivity can be tuned in multiple ways—imagine a set of dials, any of which could adjust that property. But in cuprates, said Shekhter, “There is only one dial to adjust resistivity. And both temperature and magnetic field, in their own way, access that one dial.” ____________________________________________________________________ __________________ If you spend all your time looking for people and things to complain about: trust me, you will find plenty to complain about.
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	Pathfinder Tags: Cuprates High Temperature Superconductor HTS LSCO superconductor

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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#1 Re: "New" Type of Conductivity 09/13/2018 8:58 AM
	__________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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SolarEagle Guru Join Date: Mar 2007 Location: by the beach in Florida Posts: 33392 Good Answers: 1817	#2 Re: "New" Type of Conductivity 09/13/2018 10:24 AM
	Interesting....unknown phenomenon... __________________ All living things seek to control their own destiny....this is the purpose of life
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70AARCuda Guru Join Date: Jan 2008 Location: Tucson, AZ Posts: 1331 Good Answers: 30	#3 Re: "New" Type of Conductivity 09/13/2018 12:20 PM
	The inverse of Clarke's Rule III of Science? Before: "Any sufficiently advanced technology* is indistinguishable from magic."* ...Now: "Any sufficiently advanced magic* is indistinguishable from technology."* __________________ ...and the Devil said: "...yes, but it's a DRY heat..!"
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Mfmatusky Power-User Join Date: Jan 2018 Posts: 124 Good Answers: 8	#4 Re: "New" Type of Conductivity 09/14/2018 9:13 AM
	What are the units of"resistivity"? For both temperature and magnetic field the article reported a POSITIVE correlation; as the input parameter increased the resistivity increased. This seems contrary. My understanding is that as temperature drops, resistance drops, down to near zero ohms near zero Kelvin. Did I miss something here?
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SolarEagle Guru Join Date: Mar 2007 Location: by the beach in Florida Posts: 33392 Good Answers: 1817	#5 In reply to #4 Re: "New" Type of Conductivity 09/14/2018 11:00 AM
	Yes it seems that as the magnetic field increases in strength the resistivity should go down... https://www.researchgate.net/figure/Electrical-resistivity-as-a-function-of-temperature-and-in-the-presence-of-magnetic-field_fig2_282809473 __________________ All living things seek to control their own destiny....this is the purpose of life
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Rixter Guru Join Date: Apr 2010 Location: About 4000 miles from the center of the earth (+/-100 mi) Posts: 9910 Good Answers: 1141	#6 In reply to #4 Re: "New" Type of Conductivity 09/14/2018 7:39 PM
	Resistivity is a property of a material and is measured in ohms x length. If you measured the resistance of a 1 cm³ piece of the material (1cm x 1cm x 1cm) between opposite faces you would read some resistance R. If the piece were 2 cm x 2 cm x 2cm, it would read R/2 because the resistance is proportional to length and inversely proportional to cross sectional area. A positive correlation means when temperature increase, resistivity increases, and when temperature decreases, resistivity decreases. The correlation is the ratio of the change of one divided by the change of the other, positive in this case. It's the same for magnetism and resistivity.
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Randall Guru Join Date: Aug 2005 Location: Hemel Hempstead, UK Posts: 5826 Good Answers: 322	#7 In reply to #4 Re: "New" Type of Conductivity 09/17/2018 5:51 AM
	"What are the units of"resistivity"?" Why wouldn't it be Ohms? "This seems contrary." No: <....increase....increase......> is the same as <......drops......drops......> Unless you're saying that they seem to be saying that there is something odd about this stuff when in fact it just acts the same as everything else. __________________ If you spend all your time looking for people and things to complain about: trust me, you will find plenty to complain about.
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Users who posted comments:

70AARCuda (1); Mfmatusky (1); PWSlack (1); Randall (1); Rixter (1); SolarEagle (2)

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