Artículos de revistas
Gradual Transition From Insulator To Semimetal Of Ca1-x Eux B6 With Increasing Eu Concentration
Registro en:
Physical Review B - Condensed Matter And Materials Physics. , v. 71, n. 18, p. - , 2005.
10980121
10.1103/PhysRevB.71.184422
2-s2.0-33644519656
Autor
Urbano R.R.
Pagliuso P.G.
Rettori C.
Schlottmann P.
Sarrao J.L.
Bianchi A.
Nakatsuji S.
Fisk Z.
Velazquez E.
Oseroff S.B.
Institución
Resumen
The local environment of Eu2+ (4 f7, S=7 2) in Ca1-x Eux B6 (0.003≤x≤1.00) is investigated by means of electron spin resonance (ESR). For x 0.003 the spectra show resolved fine and hyperfine structures due to the cubic crystal electric field and nuclear hyperfine field, respectively. The resonances have Lorentzian line shape, indicating an insulating environment for the Eu2+ ions. For 0.003 x 0.07, as x increases, the ESR lines broaden due to local distortions caused by the Eu Ca ions substitution. For 0.07 x 0.30, the lines broaden further and the spectra gradually change from Lorentzian to Dysonian resonances, suggesting a coexistence of both insulating and metallic environments for the Eu2+ ions. In contrast to Ca1-x Gdx B6, the fine structure is still observable up to x≈0.15. For x 0.30 the fine and hyperfine structures are no longer observed, the line width increases, and the line shape is purely Dysonian, anticipating the semimetallic character of EuB6. This broadening is attributed to a spin-flip scattering relaxation process due to the exchange interaction between conduction and Eu2+ 4f electrons. High-field ESR measurements for x 0.15 reveal smaller and anisotropic linewidths, which are attributed to magnetic polarons and Fermi surface effects, respectively. © 2005 The American Physical Society. 71 18
Young, D.P., (1999) Nature (London), 397, p. 412. , NATUAS 0028-0836 10.1038/17081 Zhitomirsky, M.E., (1999) Nature (London), 402, p. 251. , NATUAS 0028-0836 10.1038/46204 Balents, L., Varma, C.M., (2000) Phys. Rev. Lett., 84, p. 1264. , PRLTAO 0031-9007 10.1103/PhysRevLett.84.1264 Barzykin, V., Gor'Kov, L.P., (2000) Phys. Rev. Lett., 84, p. 2207. , PRLTAO 0031-9007 10.1103/PhysRevLett.84.2207 Jarlborg, T., (2001) Physica B, 307, p. 291. , PHYBE3 0921-4526 10.1016/S0921-4526(01)00629-9 Jarlborg, T., (2000) Phys. Rev. Lett., 85, p. 186. , PRLTAO 0031-9007 10.1103/PhysRevLett.85.186 Ceperley, D., (1999) Nature (London), 397, p. 386. , NATUAS 0028-0836 10.1038/17011 Tromp, H.J., (2001) Phys. Rev. Lett., 87, p. 016401. , PRLTAO 0031-9007 10.1103/PhysRevLett.87.016401 Massidda, S., Continenza, A., De Pascale, T.M., Monnier, R., (1997) Z. Phys. B: Condens. Matter, 102, p. 83. , ZPCMDN 0722-3277 10.1007/s002570050267 Urbano, R.R., Rettori, C., Barberis, G.E., Torelli, M., Bianchi, A., Fisk, Z., Pagliuso, P.G., Oseroff, S.B., (2002) Phys. Rev. B, 65, p. 180407. , PRBMDO 0163-1829 10.1103/PhysRevB.65.180407 Moriwaka, T., (2001) J. Phys. Soc. Jpn., 70, p. 341. , JUPSAU 0031-9015 10.1143/JPSJ.70.341 Hall, D., (2001) Phys. Rev. B, 64, p. 233105. , PRBMDO 0163-1829 10.1103/PhysRevB.64.233105 Vonlanthen, P., (2000) Phys. Rev. B, 62, p. 10076. , PRBMDO 0163-1829 10.1103/PhysRevB.62.10076 Ott, H.R., (1997) Z. Phys. B: Condens. Matter, 102, p. 337. , ZPCMDN 0722-3277 10.1007/s002570050297 Gavilano, J.L., (2001) Phys. Rev. B, 63, p. 140410. , PRBMDO 0163-1829 10.1103/PhysRevB.63.140410 Gianniò, K., (2002) J. Phys.: Condens. Matter, 14, p. 1035. , JCOMEL. 0953-8984. 10.1088/0953-8984/14/5/308 Denlinger, J.D., (2002) Phys. Rev. Lett., 89, p. 157601. , PRLTAO 0031-9007 10.1103/PhysRevLett.89.157601 Rhyee, J., Cho, B.K., Ri, H.-C., (2003) Phys. Rev. B, 67, p. 125102. , PRBMDO 0163-1829 10.1103/PhysRevB.67.125102 Souma, S., Komatsu, H., Takahashi, T., Kaji, R., Sasaki, T., Yokoo, Y., Akimitsu, J., (2003) Phys. Rev. Lett., 90, p. 027202. , PRLTAO 0031-9007 10.1103/PhysRevLett.90.027202 Terashima, T., (2000) J. Phys. Soc. Jpn., 69, p. 2423. , JUPSAU 0031-9015 10.1143/JPSJ.69.2423 Matsubayashi, K., (2002) Nature (London), 420, p. 143. , NATUAS 0028-0836 10.1038/420143b Fisk, Z., (2002) Nature (London), 420, p. 144. , NATUAS 0028-0836 10.1038/420144a Bennett, M.C., Van Lierop, J., Berkeley, E.M., Mansfield, J.F., Henderson, C., Aronson, M.C., Young, D.P., Lacerda, A., (2004) Phys. Rev. B, 69, p. 132407. , PRBMDO 0163-1829 10.1103/PhysRevB.69.132407 Süllow, S., (1998) Phys. Rev. B, 57, p. 5860. , PRBMDO. 0163-1829. 10.1103/PhysRevB.57.5860 Paschen, S., (2000) Phys. Rev. B, 61, p. 4174. , PRBMDO 0163-1829 10.1103/PhysRevB.61.4174 Wigger, G.A., Walti, Ch., Ott, H.R., Bianchi, A.D., Fisk, Z., (2002) Phys. Rev. B, 66, p. 212410. , PRBMDO 0163-1829 10.1103/PhysRevB.66.212410 Wigger, G.A., Monnier, R., Ott, H.R., Young, D.P., Fisk, Z., (2004) Phys. Rev. B, 69, p. 125118. , PRBMDO 0163-1829 10.1103/PhysRevB.69.125118 Calderon, M.J., Wegener, L.G.L., Littlewood, P.B., (2004) Phys. Rev. B, 70, p. 092408. , PRBMDO 0163-1829 10.1103/PhysRevB.70.092408 Kuneš, J., Pickett, W.E., (2004) Phys. Rev. B, 69, p. 165111. , PRBMDO 0163-1829 10.1103/PhysRevB.69.165111 Pereira, V.M., Lopes Dos Santos, J.M.B., Castro, E.V., Castro-Neto, A.H., (2004) Phys. Rev. Lett., 93, p. 147202. , PRLTAO 0031-9007 10.1103/PhysRevLett.93.147202 Urbano, R.R., Pagliuso, P.G., Sarrao, J.L., Oseroff, S.B., Rettori, C., Bianchi, A., Nakatsuji, S., Fisk, Z., (2004) J. Magn. Magn. Mater., 272-276 (1 SUPPL.), p. 1659. , JMMMDC 0304-8853 Urbano, R.R., Pagliuso, P.G., Rettori, C., Oseroff, S.B., Sarrao, J.L., Schlottmann, P., Fisk, Z., (2004) Phys. Rev. B, 70, p. 140401. , PRBMDO 0163-1829 10.1103/PhysRevB.70.140401 Abragam, A., Bleaney, B., (1970) EPR of Transition Ions, , Clarendon Press, Oxford Davidov, D., Rettori, C., Zevin, V., (1975) Solid State Commun., 16, p. 247. , SSCOA4 0038-1098 10.1016/0038-1098(75)90584-0 Rettori, C., Davidov, D., Grayewskey, A., Walsh, W.M., (1975) Phys. Rev. B, 11, p. 4450. , PLRBAQ 0556-2805 10.1103/PhysRevB.11.4450 Luft, H., Baberschke, K., Winzer, K., (1982) Z. Phys. B: Condens. Matter, 47, p. 195. , ZPCMDN 0722-3277 Oseroff, S.B., Calvo, R., (1978) Phys. Rev. B, 18, p. 3041. , PLRBAQ 0556-2805 10.1103/PhysRevB.18.3041 Pake, G.E., Purcell, E.M., (1948) Phys. Rev., 74, p. 1184. , PHRVAO 0031-899X 10.1103/PhysRev.74.1184 Bloembergen, N., (1952) J. Appl. Phys., 23, p. 1383. , JAPIAU 0021-8979 10.1063/1.1702079 Feher, G., Kip, A.F., (1955) Phys. Rev., 98, p. 337. , PHRVAO 0031-899X 10.1103/PhysRev.98.337 Dyson, F.J., (1955) Phys. Rev., 98, p. 349. , PHRVAO 0031-899X 10.1103/PhysRev.98.349 Sperlich, G., Jansen, K., (1974) Solid State Commun., 15, p. 1105. , SSCOA4 0038-1098 10.1016/0038-1098(74)90542-0 Buckmaster, H.A., Shing, Y.H., (1972) Phys. Status Solidi a, 12, p. 325. , PSSABA 0031-8965 Bartkowski, M., Northcott, D.J., Park, J.M., Deddoch, A.H., Hedgcock, F.T., (1985) Solid State Commun., 56, p. 659. , SSCOA4 0038-1098 10.1016/0038-1098(85)90773-2 Davidov, D., Maki, K., Orbach, R., Rettori, C., Chock, E.P., (1973) Solid State Commun., 12, p. 621. , SSCOA4 0038-1098 10.1016/0038-1098(73)90299-8 Essam, J.W., (1972) Phase Transitions and Critical Phenomena, 2, p. 197. , edited by C. Domb and M. S. Green (Academic Press, London Schlottmann, P., Hellberg, C.S., (1996) J. Appl. Phys., 79, p. 6414. , JAPIAU 0021-8979 10.1063/1.362014 Oseroff, S., Calvo, R., Stankiewicz, J., Fisk, Z., Johnston, D.C., (1979) Phys. Status Solidi B, 94, p. 133. , PSSBBD 0370-1972 Aronson, M.C., Sarrao, J.L., Fisk, Z., Whitton, M., Brandt, B.L., (1999) Phys. Rev. B, 59, p. 4720. , PRBMDO 0163-1829 10.1103/PhysRevB.59.4720 Fisk, Z., (1979) J. Appl. Phys., 50, p. 1911. , JAPIAU 0021-8979 10.1063/1.327162 Goodrich, R.G., Harrison, N., Vuillemin, J.J., Teklu, A., Hall, D.W., Fisk, Z., Young, D., Sarrao, J., (1998) Phys. Rev. B, 58, p. 14896. , PRBMDO 0163-1829 10.1103/PhysRevB.58.14896 Götze, W., Wölfle, P., (1971) J. Low Temp. Phys., 5, p. 575. , JLTPAC. 0022-2291 Wigger, G.A., Beeli, C., Felder, E., Ott, H.R., Bianchi, A.D., Fisk, Z., (2004) Phys. Rev. Lett., 93, p. 147203. , PRLTAO 0031-9007 10.1103/PhysRevLett.93.147203