Stoichiometric iron telluride is a superconductor: magnetic mystery is solved
Antiferromagnetism is caused by excess iron The post Stoichiometric iron telluride is a superconductor: magnetic mystery is solved appeared first on Physics World .
The long-standing mystery surrounding iron telluride's lack of superconductivity has been solved by researchers who discovered that excess iron in the crystal lattice suppresses its natural superconductivity. This finding, published in a recent study, resolves a decades-old puzzle in the field of condensed matter physics.
Iron telluride, a material with a similar structure to other superconductors like iron selenide, has always exhibited antiferromagnetic order at low temperatures, unlike its selenide counterpart, which becomes superconducting. The antiferromagnetic behavior in iron telluride has been a significant obstacle in understanding its potential for superconductivity.
Researchers from the United States have now shown that the suppression of superconductivity in iron telluride is due to the presence of excess iron in its crystal lattice. This revelation provides a clear explanation for why iron telluride's magnetic structure is fundamentally different from that of other iron-based superconductors.
Condensed matter physicist Pengcheng Dai of Rice University in Texas explained that the magnetic structure of iron telluride has always been a puzzle in the field. "People say, 'Oh, it's more correlated' тАУ but the problem with that is that when you dope it with selenium and it does become superconducting, all the electric and magnetic properties occur at the exact same wave vector as other iron-based superconductors," Dai said.
The research team, led by condensed matter experimentalist Cui-Zu Chang of Pennsylvania State University in the United States, conducted multiple experiments involving the growth of tellurium compounds on iron telluride substrates. These experiments reliably produced superconductivity, suggesting that iron telluride itself might have a superconducting state.
Despite these findings, the possibility of iron telluride exhibiting superconductivity was rarely discussed in the scientific community. Chang noted that the focus had been on chemical substitution, such as replacing tellurium with selenium, to induce superconductivity. However, the new study highlights that the intrinsic superconducting state of iron telluride could be significant for further exploration of iron-based superconductivity.
The discovery of superconductivity in iron telluride could open the door to the study of interesting physics, such as potential topological superconductivity. This would allow researchers to investigate the material's unique properties and explore new avenues in condensed matter physics.
The results of this study not only resolve the long-standing puzzle surrounding iron telluride but also provide a secure platform for further exploration of iron-based superconductivity. As the field continues to advance, understanding the intrinsic properties of materials like iron telluride will be crucial in unlocking new discoveries and applications in superconductivity research.
