Cov kws tshawb fawb tau pom tus cwj pwm txawv txawv tshiab thaum cov khoom sib nqus tau rhuab.Thaum qhov kub thiab txias, cov hlau nplaum sib nqus hauv cov khoom no "freezes" rau hauv hom zoo li qub, uas feem ntau tshwm sim thaum kub poob.Cov kws tshawb fawb tau luam tawm lawv qhov kev tshawb pom hauv phau ntawv Journal Nature Physics.
Cov kws tshawb fawb pom qhov tshwm sim no hauv cov ntaub ntawv neodymium.Ob peb xyoos dhau los, lawv tau piav txog lub ntsiab lus no yog "tus kheej induced spin iav".Spin iav feem ntau yog hlau alloy, piv txwv li, hlau atoms yog randomly tov rau hauv ib daim phiaj ntawm tooj liab atoms.Txhua lub atom hlau zoo li cov hlau nplaum me me, lossis kiv.Cov randomly muab tso rau spin taw tes nyob rau hauv ntau yam lus qhia.
Tsis zoo li cov iav tsom iav ib txwm siv, uas tau sib xyaw nrog cov khoom sib nqus, neodymium yog ib qho khoom siv.Thaum tsis muaj lwm yam tshuaj, nws qhia tau hais tias tus cwj pwm ntawm vitrification hauv crystal daim ntawv.Kev sib hloov ua ib tug qauv ntawm kev sib hloov zoo li ib tug kauv, uas yog random thiab tas li hloov.
Hauv txoj kev tshawb fawb tshiab no, cov kws tshawb nrhiav pom tias thaum lawv ua kom sov neodymium los ntawm -268 ° C mus rau -265 ° C, nws tig "krozen" rau hauv cov qauv khoom, tsim cov hlau nplaum ntawm qhov kub siab dua.Raws li cov khoom txias, qhov sib txawv ntawm cov kauv tig rov qab.
Alexander khajetoorians, tus kws tshaj lij kev sojntsuam tsom iav ntawm Radboud University hauv Netherlands tau hais tias "hom 'txias' no feem ntau tsis tshwm sim hauv cov khoom sib nqus.
Qhov kub siab dua ua rau muaj zog hauv cov khoom khib nyiab, kua, lossis roj.Tib yam siv rau cov hlau nplaum: ntawm qhov kub siab dua, kev sib hloov feem ntau pib wobble.
Khajetoorians tau hais tias, "tus cwj pwm sib nqus ntawm neodymium peb tau pom yog qhov tsis sib xws rau qhov tshwm sim 'ib txwm'."Qhov no yog qhov sib txawv heev, zoo li dej hloov mus rau hauv dej khov thaum cua sov."
Qhov tshwm sim tsis zoo no tsis yog tshwm sim hauv qhov - ob peb cov ntaub ntawv paub tias coj tus cwj pwm tsis raug.Lwm qhov piv txwv uas paub zoo yog Rochelle ntsev: nws cov nqi them ua qauv txiav txim siab ntawm qhov kub siab dua, tab sis raug faib tawm ntawm qhov kub qis dua.
Cov lus piav qhia nyuaj ntawm cov iav iav yog lub ntsiab lus ntawm 2021 Nobel nqi zog hauv physics.Kev nkag siab yuav ua li cas cov iav tsom iav no ua haujlwm tseem ceeb rau lwm yam kev tshawb fawb.
Khajetoorians tau hais tias, "yog tias thaum kawg peb tuaj yeem sim ua tus cwj pwm ntawm cov ntaub ntawv no, nws tseem tuaj yeem cuam tshuam tus cwj pwm ntawm ntau lwm cov ntaub ntawv."
Muaj peev xwm eccentric tus cwj pwm muaj feem xyuam nrog lub tswv yim ntawm degeneracy: ntau lub xeev sib txawv muaj lub zog tib yam, thiab lub cev ua rau ntxhov siab.Qhov kub thiab txias tuaj yeem hloov qhov xwm txheej no: tsuas yog ib lub xeev tshwj xeeb xwb, tso cai rau lub kaw lus kom nkag mus rau hauv hom.
Tus cwj pwm coj txawv txawv no tuaj yeem siv rau hauv cov ntaub ntawv tshiab khaws cia lossis suav cov ntsiab lus, xws li lub hlwb zoo li kev suav.
Post lub sij hawm: Aug-05-2022
