UPd2Al3: Difference between revisions
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==Discovery== |
==Discovery== |
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Heavy-fermion superconductivity was discovered already in the late 1970s (with CeCu<sub>2</sub>Si<sub>2</sub> being the first example), but the number of heavy-fermion compounds known to superconduct was still very small in the early 1990s, when Christoph Geibel in the group of [[Frank Steglich]] found two closely related heavy-fermion superconductors, UNi<sub>2</sub>Al</sub>3</sub> (T<sub>c</sub>=1K) and UPd<sub>2</sub>Al<sub>3</sub> (T<sub>c</sub>=2K), which were published in 1991.<ref name="GeibelUPd2Al3" /> At that point, the T<sub>c</sub>=2.0K of UPd<sub>2</sub>Al<sub>3</sub> was the highest critical temperature amongst all know heavy-fermion superconductors, and this record would stand for 10 years until [[CeCoIn5|CeCoIn<sub>5</sub>]] was discovered in 2001. |
Heavy-fermion superconductivity was discovered already in the late 1970s (with CeCu<sub>2</sub>Si<sub>2</sub> being the first example), but the number of heavy-fermion compounds known to superconduct was still very small in the early 1990s, when Christoph Geibel in the group of [[Frank Steglich]] found two closely related heavy-fermion superconductors, UNi<sub>2</sub>Al</sub>3</sub> (T<sub>c</sub>=1K) and UPd<sub>2</sub>Al<sub>3</sub> (T<sub>c</sub>=2K), which were published in 1991.<ref>{{cite journal|journal= Z. Phys. B | doi=10.1007/BF01313397|title=A new heavy-fermion superconductor: UNi<sub>2</sub>Al<sub>3</sub>| year=1991|volume=83| pages=305|last1=Geibel|first1=C. |last2=Thies|first2=S.|last3=Kaczorowski|first3=D.| last4=Mehner|first4=A.| last5=Grauel|first5=A.| last6=Seidel|first6=B.| last7=Ahlheim|first7=U.| last8=Helfrich|first8=R.| last9=Petersen|first9=K.| last10=Bredl|first10=C.D.| last11=Steglich|first11=F.}}</ref><ref name="GeibelUPd2Al3" /> At that point, the T<sub>c</sub>=2.0K of UPd<sub>2</sub>Al<sub>3</sub> was the highest critical temperature amongst all know heavy-fermion superconductors, and this record would stand for 10 years until [[CeCoIn5|CeCoIn<sub>5</sub>]] was discovered in 2001.<ref>{{cite journal|journal= J. Phys.: Condens. Matter| doi=10.1088/0953-8984/13/17/103|title=Heavy-fermion superconductivity in CeCoIn<sub>5</sub> at 2.3 K| year=2001|volume=13| pages=L337|last1=Petrovic|first1=C.|last2=Pagliuso| first2=P.G.|last3=Hundley|first3=M.F.|last4=Movshovich|first4=R.| last5=Sarrao|first5=J.L.| last6=Thompson|first6=J.D.| last7=Fisk|first7=Z.| last8=Monthoux|first8=P.|arxiv = cond-mat/0103168 }}</ref> |
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==References== |
==References== |
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Revision as of 14:25, 25 July 2016
UPd2Al3 is a heavy-fermion superconductor with a hexagonal crystal structure and critical temperature Tc=2.0K that was discovered in 1991.[1] Furthermore, UPd2Al3 orders antiferromagnetically at TN=14K, and UPd2Al3 thus features the unusual behavior that this material, at temperatures below 2K, is simultaneously superconducting and magnetically ordered. Later experiments demonstrated that superconductivity in UPd2Al3 is magnetically mediated,[2] and UPd2Al3 therefore serves as a prime example for non-phonon-mediated superconductors.
Discovery
Heavy-fermion superconductivity was discovered already in the late 1970s (with CeCu2Si2 being the first example), but the number of heavy-fermion compounds known to superconduct was still very small in the early 1990s, when Christoph Geibel in the group of Frank Steglich found two closely related heavy-fermion superconductors, UNi2Al3 (Tc=1K) and UPd2Al3 (Tc=2K), which were published in 1991.[3][1] At that point, the Tc=2.0K of UPd2Al3 was the highest critical temperature amongst all know heavy-fermion superconductors, and this record would stand for 10 years until CeCoIn5 was discovered in 2001.[4]
References
- ^ a b Geibel, C.; Schank, C.; Thies, S.; Kitazawa, H.; Bredl, C.D.; Böhm, A.; Rau, M.; Grauel, A.; Caspary, R.; Helfrich, R.; Ahlheim, U.; Weber, G.; Steglich, F. (1991). "Heavy-fermion superconductivity at Tc=2K in the antiferromagnet UPd2Al3". Z. Phys. B. 84: 1. doi:10.1007/BF01453750.
- ^ Sato, N.K.; Aso, N.; Miyake, K.; Shiina, R.; Thalmeier, P.; Varelogiannis, G.; Geibel, C.; Steglich, F.; Fulde, P.; Komatsubara, T. (2001). "Strong coupling between local moments and superconducting 'heavy' electrons in UPd2Al3". Nature. 410: 340. doi:10.1038/35066519.
- ^ Geibel, C.; Thies, S.; Kaczorowski, D.; Mehner, A.; Grauel, A.; Seidel, B.; Ahlheim, U.; Helfrich, R.; Petersen, K.; Bredl, C.D.; Steglich, F. (1991). "A new heavy-fermion superconductor: UNi2Al3". Z. Phys. B. 83: 305. doi:10.1007/BF01313397.
- ^ Petrovic, C.; Pagliuso, P.G.; Hundley, M.F.; Movshovich, R.; Sarrao, J.L.; Thompson, J.D.; Fisk, Z.; Monthoux, P. (2001). "Heavy-fermion superconductivity in CeCoIn5 at 2.3 K". J. Phys.: Condens. Matter. 13: L337. arXiv:cond-mat/0103168. doi:10.1088/0953-8984/13/17/103.