Antiferromagnetic cov ntsiab lus los yog cov khoom hauv cov khoom sib nqus sib nqus

Antiferromagnetic cov ntsiab lus los yog cov khoom hauv cov khoom sib nqus sib nqus? Hauv qab Neel qhov kub thiab txias, lub sijhawm sib nqus ntawm cov atoms uas nyob ib sab hauv cov khoom yog spontaneously aligned antiparallel thiab cov hlau nplaum nthuav tawm thaum lub sijhawm sib nqus sib nqus yog xoom. Nyob rau hauv ib yam khoom nrog antiferromagnetism, lub sij hawm sib nqus ntawm cov atoms uas nyob ib sab yog sib npaug ntawm qhov loj thiab rov qab rau hauv kev coj, yog li cov hlau nplaum yog xoom, uas qhia cov hlau nplaum tsis muaj zog.

Tus nqi ntawm magnetic susceptibility zoo ib yam li cov tshuaj paramagnetic, tab sis nws nce nrog qhov kub thiab txias; saum toj no Neel kub, qhov sib nqus susceptibility txo nrog qhov nce ntawm qhov kub thiab txias, uas coj zoo li paramagnetism.

Cov ntsiab lus hlau Cr thiab Mn yog cov tshuaj antiferromagnetic, thiab qee lub ntiaj teb tsis tshua muaj cov ntsiab lus yog antiferromagnetic nyob rau hauv qee qhov kub tsis tshua muaj.

Ntau cov hlau nplaum antiferromagnetic muaj Cr thiab Mn, thiab feem ntau ntawm lawv tau txiav txim kom muaj cov ntsiab lus no, xws li MnAu, CrSb, Mn2As, NiMn, thiab lwm yam. Lwm yam yog Fe, Co, Ni, Mn oxides, sulfides lossis halides, xws li MnO. , FeO, CoO, NiO, MnS, -Fe2O3, FeS, FeCl2, MnF2, thiab lwm yam.

Cov hlau tsis zoo kuj tseem muaj cov tshuaj tiv thaiv kab mob, xws li manganese-nplua nuj Mn-Cu thiab Mn-Au alloys; MnCr alloys tsis zoo, thaum muaj kev hloov pauv antiferromagnetic tshwm sim, tsis yog qhov hloov pauv ntawm cov hlau nplaum sib nqus, tab sis kuj muaj lwm yam khoom siv lub cev (xws li expansion coefficient, thiab lwm yam) kuj hloov. Siv cov cuab yeej no tuaj yeem ua kom tsis muaj hlau nplaum (tsis muaj ferromagnetic) qis-expansion alloys.