—The Daily Collegian Friday, April 22, 1988 Leading physicist lectures on advances in superconductivity By SEMELE HALKEDIS Collegian Science Writer Electric cats, controlled fusion, ultra-sensitive optical devices, and power generators are just a few of the potential applications of high-temper ature superconductive materials, said Paul Chu, a leading physicist in the field of superconductivity last night. Over 350 people crammed into 119 Osmond to hear Chu give the 1988 Mueller Lecture in physics, titled "High-Temperature Superconductiv ity Past. Present, and Future!" Chu began by explaining the basic properties of superconductors. He said superconductors conduct electri city with no electrical resistance and cannot be penetrated by magnetic fields. In order for a material to act as a superconductor, Chu said three bar riers must be overcome the tran sition temperature, the critical current density, and the critical mag netic field. Going beyond any of these critical points will cause a material to stop acting as a superconductor. Chu said when superconductivity was first discovered about 75 years ago, materials had to be cooled to a temperature of four Kelvin, or about 277 degrees Celcius below zero, in order to act as superconductors. Because these materials required Movin' On features many A crowd of 10,000 is expected to visit the HUB lawn tomorrow to hear the live bands performing at Movin' On, the annual free concert sponsored by the Association of Residence Hall Students in cooperation with WWZU FM. Calling the event "an all-around musical day," publicity chairman Stevie Rocco said the movie Dirty Dancing will be shown following the last band's performance around 10:30 P.m- The eight bands scheduled to play are: .. . ...„.. ...„ tyzi, las „ 0 sos.e„, 0 , 1 11 * to P. ' .... . . . SW.' ~,,t 55 5 Dbbb :- ... ,„,e, ~,,e, P'''' c' Id .: ' * : < \ Sc ''''' ' . :... ot'aa' if..--ce"` $ 12 4. ,,,_ Per I ) age ' ,-,o*lL`l) ,0 .. coo-- F ' \dn,'.''''' a'07,, ,, Ntl Co mae .:, 10'eaort eskiitional opy .o.^,r.s.‘e ' 13 S c,,,slW Co"''' ' ' le , C.'' Pr * Ili g h q Ualit Y -..p...ii: c %no's' cDx- - ~,, 1 Cou' IC ..,11 \ '''' ~, t'' ' • fait service qv 03-s:6'is- coV, ~ Ra,,. CoAlcec P's, .0. ,, '' col ~ ,,,,,i, % :0 0, , Seu ne • professiOnal appearance -rn , --,„,00 , :,,.. , " 7 ,... n. ,, t0: also binding, laminating' transParendet v g,,,..cf... . f,A,,, ~1, ,,,.,,, u , labeb, & self-serve copies ...t -s _ A wl, 1K Moe' 7 '''',..,,,•00a40( SO S' ;r0;401,4 ut . V. r eauor's lw v ? stat e C° tare° 4 ' S, evo ~,y, r , ,V1, 4 , s , ts '' 9 ''' 's t'S°‘"loPeadC'''9ls sso Ca \ ''''' ''' S '' 'C r.ce , '''' ' '' KOPEASE „, ......,,,,r.,- .ine over ...- State College fieNefonte ....ltr" 5..-,,,,_„.„.. 436 E College Ave. 139 S. Allegheny St ~, 0 1 ' s . - 9 '` , .a. c h 23.4484 355-3788 ~ ,,v s, b , .--P,„........ ( ; . ..a'• • , 1, 1 .; ' 111; 111 ; 411(1" . ' I . : • . ii , • . / V I f. - . ... . 00 ...b,-,. 1. • * 1 R to 4 such low temperatures to be super conductive, they had to be cooled by liquid helium, which is rare, expen sive, and difficult to work with, Chu said. As research continued, materials which acted as superconductors at higher temperatures and could be cooled with liquid hydrogen were discovered, and in 1986 a high-tern perature copper oxide superconduc tor was discovered. Chu said he and his colleagues soon identified the material, which soon became known as the "one-two-three compound." The compound acts as a superconductor at temperatures around 90 Kelvin." These results were presented at the American Physical Society's annual meeting in March 1987, creating a historic occasion that was called the "Woodstock of Physics,"Chu said. Chu said much work is still being done using the oxide superconductors in an attempt to find even higher temperature superconductors. Superconductive compounds have many potential applications, he said. On a small scale, superconductors could be used in the form of a thin film with ultra-fast devices and in radar detectors, for example. These applications could be implemented in three to five years, Chu said. On a large scale, in bulk form or wire, superconductors could be used Earthtones Split Decision 11th Hour Affordable Floors Night Shift Tom Larsen Band They Might Be Giants Bricklin T-shirts will be sold for $5 today at a table in the HUB basement and on Saturday during the concert, Rocco said. Buttons will also be sold for 50 cents. Marshalls will be on duty to police the area, check for alcohol and pick in motors, power generators, power storage, electric cars, or controlled fusion, he said. These methods could be applied in 10 years, he speculated. However, all of the applications which have been considered for su perconductors were based on conven tional superconductors, not the recently discovered oxide supercon ductive materials. One possible appli cation for these materials would be an ultra-sensitive optical device. Chu said one thing often overlooked is the use of these materials in a non superconductive application. These applications could include chemical batteries, and smoke detectors. performers 11:30 a.m. ...12:45 p.m 2:15 p.m 3:15 p.m 4:15 p.m .....5:30 p.m 7:30 p.m ■ Please see a story on the bands. up trash at the concert. Rocco said more volunteers are still needed and would have to work a two-hour shift during the day and get a free T-shirt. Anyone interested in being a mar shall during the concert can still get involved today by calling either the ARHS office at 863-2747 or leave a message at 862-6321. 8:15 p.m Dusty Donovan from "As the World Turns" will be speaking and signing autographs Saturday, April 23rd at the Nittany Mall. Mall Hours: Mon-Sat 10-9 Sun 12-5 Collegian Photo / Lydia Kasparian Paul Chu Page 26 by Maryann Liddy OX • 'l - 11( 'to • OX • II irt,i ( Iii1(1 •OX • 'll, ( •OX • Thetii 'hi •OX • OX The Brothers i-n)(1 Little Sisters of Theta Chi Would Like to Thank the Following for Their I lelp In Making K.I.C.K.S. 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