Photoinduced magnetism in CdF2 with bistable donors:: The clue for the negative U?

被引：5
|
作者：
Langer, JM [1 ]
Suchocki, A [1 ]
Szymczak, R [1 ]
Baran, M [1 ]
机构：
[1] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
来源：
DEFECTS IN SEMICONDUCTORS - ICDS-19, PTS 1-3 | 1997年 / 258-2卷
关键词：
CdF2 : In; CdF2 : Ga; bistable centres; negative U; photomagnetism;
D O I：
10.4028/www.scientific.net/MSF.258-263.1449
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report measurements of photoinduced magnetisation of CdF2 bulk crystals doped with In or Ga. At temperatures at which metastable photo transformation of donors occurs, magnetic susceptibility increases and it follows a Curie law. Low magnetic field data are dominated by spin-spin ferromagnetic coupling of d(5) electrons of Mn codopants with donor electrons of In or Ga metastably phototransferred from a localised to the hydrogenic shallow donor state. Enhancement of magnetisation is due to effective spin increase resulting from this coupling. At high magnetic fields (above 2 T) and temperatures below 5K, saturation of the photoinduced magnetisation is observed. This provides first direct proof of a negative-U character of the donors in CdF2.
引用
收藏
页码：1449 / 1454
页数：6
相关论文
共 49 条
  • [21] Photodielectric effect and “Configuration” modes of bistable centers in the CdF2: Ga crystal
    A. I. Ritus
    V. B. Anzin
    A. A. Volkov
    Journal of Experimental and Theoretical Physics, 2008, 107 : 482 - 490
  • [22] Photodielectric Effect and "Configuration" Modes of Bistable Centers in the CdF2:Ga Crystal
    Ritus, A. I.
    Anzin, V. B.
    Volkov, A. A.
    JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS, 2008, 107 (03) : 482 - 490
  • [23] Dynamic wavefront-conjugating mirror based on CdF2 crystals with bistable in centers
    Angervaks, A. E.
    Dimakov, S. A.
    Kliment'ev, S. I.
    Ryskina, A. I.
    Shcheulin, A. S.
    OPTICS AND SPECTROSCOPY, 2006, 101 (01) : 131 - 135
  • [24] A dynamic phase-conjugate mirror based on CdF2 crystals with bistable centers
    A. E. Angervaks
    S. A. Dimakov
    S. I. Kliment’ev
    A. I. Ryskin
    A. S. Shcheulin
    Optics and Spectroscopy, 2005, 98 : 934 - 937
  • [25] CdF2 crystals with bistable impurity centers as media of the real-time holography
    Ryskin, A. I.
    Shcheulin, A. S.
    Kazatiskii, S. A.
    Angervaks, A. E.
    JOURNAL OF LUMINESCENCE, 2007, 125 (1-2) : 18 - 24
  • [26] Dynamic wavefront-conjugating mirror based on CdF2 crystals with bistable in centers
    A. E. Angervaks
    S. A. Dimakov
    S. I. Kliment’ev
    A. I. Ryskin
    A. S. Shcheulin
    Optics and Spectroscopy, 2006, 101 : 131 - 135
  • [27] A dynamic phase-conjugate mirror based on CdF2 crystals with bistable centers
    Angervaks, AE
    Dimakov, SA
    Kliment'ev, SI
    Ryskin, AI
    Shcheulin, AS
    OPTICS AND SPECTROSCOPY, 2005, 98 (06) : 934 - 937
  • [28] Dynamics of the transformation of bistable centers and lattice in CdF2 crystals under femtosecond pulsed photoexcitation
    D. I. Stasel’ko
    S. A. Tikhomirov
    O. V. Buganov
    A. S. Shcheulin
    A. E. Angervaks
    A. I. Ryskin
    Optics and Spectroscopy, 2011, 110 : 33 - 41
  • [29] Dynamics of the transformation of bistable centers and lattice in CdF2 crystals under femtosecond pulsed photoexcitation
    Stasel'ko, D. I.
    Tikhomirov, S. A.
    Buganov, O. V.
    Shcheulin, A. S.
    Angervaks, A. E.
    Ryskin, A. I.
    OPTICS AND SPECTROSCOPY, 2011, 110 (01) : 33 - 41
  • [30] SHALLOW DONORS IN CDF2 - A TEST OF THE TOYOZAWA MODEL OF THE IMPURITY SELF-TRAPPING
    DMOCHOWSKI, J
    LANGER, JM
    DOBOSZ, D
    ACTA PHYSICA POLONICA A, 1987, 71 (03) : 349 - 351
12345