エキゾチック超伝導体の超能力を解明する意外な新手段を発見(Scientists Uncover Surprising New Clues to Exotic Superconductors’ Superpowers)

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地球上で最も強力な磁石を駆使して、謎の金属の新モデルを探索することに成功 Study leverages one of the most powerful magnets on Earth to probe a new model of a mysterious metal

2022-03-24 ローレンスバークレー国立研究所(LBNL)

これまでの物理学の常識を覆すような、抵抗ゼロで効率的に電流を流すことができる非通常型超伝導体の不思議な挙動について、研究チームが新しい手がかりを発見しました。

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CeCoIn5における対称性の破れを伴わない非局在量子相転移の証拠 Evidence for a delocalization quantum phase transition without symmetry breaking in CeCoIn5

NIKOLA MAKSIMOVIC ,DANIEL H. EILBOTT ,TESSA COOKMEYER ,FANGHUI WANJAN RUSZ ,VIKRAM NAGARAJAN,SHANNON C. HALEY ,ERAN MANIV ,AMANDA GONG ,STEFANO FAUBELIAN M. HAYES ,ALI BANGURAJOHN SINGLETON ,JOHANNA C. PALMSTROM ,LAUREL WINTER ,ROSS MCDONALD, SOOYOUNG JANG ,PING AIYI LIN ,SAMUEL CIOCYS ,JACOB GOBBO,YOCHAI WERMAN,PETER M. OPPENEER ,EHUD ALTMAN ,ALESSANDRA LANZARA ,AND JAMES G. ANALYTIS

Published: 2 Dec 2021 DOI: 10.1126/science.aaz4566

Abstract

The study of quantum phase transitions that are not clearly associated with broken symmetry is a major effort in condensed matter physics, particularly in regard to the problem of high-temperature superconductivity, for which such transitions are thought to underlie the mechanism of superconductivity itself. Here we argue that the putative quantum critical point in the prototypical unconventional superconductor CeCoIn5 is characterized by the delocalization of electrons in a transition that connects two Fermi surfaces of different volumes, with no apparent broken symmetry. Drawing on established theory of f-electron metals, we discuss an interpretation for such a transition that involves the fractionalization of spin and charge, a model that effectively describes the anomalous transport behavior we measured for the Hall effect.

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