Coexistence of superconductivity and ferromagnetism in the d-band metal ZrZn2

被引:404
作者
Pfleiderer, C [1 ]
Uhlarz, M
Hayden, SM
Vollmer, R
von Löhneysen, H
Bernhoeft, NR
Lonzarich, GG
机构
[1] Univ Karlsruhe, Inst Phys, D-76128 Karlsruhe, Germany
[2] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England
[3] Forschungszentrum Karlsruhe, Inst Festkorperphys, D-76021 Karlsruhe, Germany
[4] CEA Grenoble, DRFMC, SPSMS, F-38054 Grenoble 9, France
[5] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England
关键词
D O I
10.1038/35083531
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
It has generally been believed that, within the context of the Bardeen-Cooper-Schrieffer (BCS) theory of superconductivity, the conduction electrons in a metal cannot be both ferromagnetically ordered and superconducting(1,2). Even when the superconductivity has been interpreted as arising from magnetic mediation of the paired electrons, it was thought that the superconducting state occurs in the paramagnetic phase(3,4). Here we report the observation of superconductivity in the ferromagnetically ordered phase of the d-electron compound ZrZn2. The specific heat anomaly associated with the superconducting transition in this material appears to be absent, and the superconducting state is very sensitive to defects, occurring only in very pure samples. Under hydrostatic pressure superconductivity and ferromagnetism disappear at the same pressure, so the ferromagnetic state appears to be a prerequisite for superconductivity. When combined with the recent observation of superconductivity in UGe2 (ref. 4), our results suggest that metallic ferromagnets may universally become superconducting when the magnetization is small.
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页码:58 / 61
页数:5
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